RU2723925C1 - Inflatable motorboat - Google Patents

Abstract

FIELD: shipbuilding.SUBSTANCE: invention relates to shipbuilding, namely to several versions of inflatable boat structures with outboard engines. Inflatable motor boat comprises a U-shaped body in a plan with an open contour of inflatable boards and a nose part, an inflatable bottom attached to the body and divided into at least three longitudinal segments. In the middle segment of the bottom there is a longitudinal tunnel. In the first version, the inner surface of the longitudinal tunnel of the boat has a substantially arc-like shape, and the tunnel includes an additional section in the vertical section of the wedge-like shape with an angle of inclination to the plane of the water surface. In the second version, the ship longitudinal tunnel includes a section in vertical section of wedge-like shape. Bottom rear end adjacent to tunnel is inclined and makes angle to surface water plane. In the third version, at least two water channels of variable depth are made in the inflatable bottom of the boat in continuation of the longitudinal tunnel.EFFECT: achieving high efficiency in operation of a boat at small and super low depths at different speeds.19 cl, 18 dwg

Description

Technical field

The present invention relates to vehicles on water, in particular, to inflatable boats with outboard engines operating in shallow water.

State of the art

A technical solution is known, disclosed in the patent for invention RU 2389633 C2 (IPC B63B 7/08; published on 05/20/2010) “Motor inflatable boat (options)”, which is an inflatable motor boat containing a U-shaped hull in plan formed open loop of inflatable sides and bow installed in the stern of the boat transom and attached from the bottom to the hull of the inflatable bottom with a pitch angle at the end from 0 ° to 50 °, and the stern end is made flat.

The above-described inflatable motor boat has, in the opinion of its author, the necessary and sufficient water resistance at the place of its breakdown at the end in the aft of the inflatable bottom when going to planing and in the planing mode of the boat, which in turn allows you to develop a high speed of movement without loss of stability.

However, this design of the boat also does not solve the problem of its use with the outboard in shallow water and when mooring to the shore, since the propeller of the outboard motor of the engine, with this design of the bottom of the boat, should also be located below its bottom. In addition, with this installation of a boat outboard during operation of the boat, the propeller may be damaged by various objects in the water.

A technical solution is known, disclosed in the patent for utility model, RU 145840 U1 (IPC B63B 7/00; published 09.27.2014) “Inflatable motor boat”, which is an inflatable motor boat containing a hull of a U-shape in plan, formed open a contour of the inflatable sides and the bow, installed in the stern of the boat transom and attached from the bottom to the hull of the inflatable bottom, in which, from the side of the plane mating with water, a longitudinal tunnel of a wedge-shaped in vertical section starting from the aft end is made with a uniform decrease in its depth to the bow parts of the boat, the length of which is from 5 to 50% of the entire length of the boat, and the depth at the stern end of the bottom is from 2 to 10 cm.

The well-known motor boat partially solved the problem of movement in shallow water and mooring to the shore, however, the volume of the aft part of the bottom, reduced due to the presence of the tunnel, leads to its lower draft under the weight of the engine, especially at low speeds or without movement. Accordingly, the engine itself in these cases is also located deeper in the water and the risk of damage is increased.

As a prototype, a well-known technical solution is disclosed in the patent for utility model RU 177429 U1 (IPC B63B 7/082; published 02/21/2018) “Inflatable motor boat”, which is an inflatable motor boat containing a U-shaped hull in plan formed by an open loop of inflatable boards and bow, attached to the hull of the inflatable bottom, and installed in the stern of the boat transom. A longitudinal tunnel is made on the bottom side of the inflatable bottom of the boat, comprising two side walls and one upper surface mating with the side walls. At the same time, the upper surface of the tunnel consists of two sections that smoothly transition into one another. The first section is located on the side of the stern and is horizontal, parallel to the upper surface of the inflatable bottom. This section smoothly passes into an inclined section located closer to the bow of the boat.

The presence of a tunnel containing inclined and horizontal sections, allows the well-known boat to direct the water flow at a certain angle upwards, which ensures the supply of water to the outboard propeller.

However, the design of this boat has a significant drawback associated with the risk of air entering the tunnel, and as a result, an increase in the likelihood of breakdown during boat movement, that is, the movement will be uneven. In addition, structurally, the well-known boat does not provide for the installation of transom plates, which, in turn, is also a serious drawback. This leads to an increase in the amount of time required to reach the planing, and also makes the feed draft known utility model more significant. This, in turn, increases the risk of damage to the outboard propeller.

Terms and Definitions

In the text of this patent application, the terms used are used in the following meanings.

U-shaped - similar to the inverted letter U.

Anti-cavitation plate - a plate located above the outboard screw, designed to prevent the screw from capturing air from the surface, thereby preventing the occurrence of cavitation.

Gliding - the movement of a swimming means on the surface of the water, in which the swimming means is held on the surface of the water due to the high-speed pressure of the water and the lifting force created by it.

The length of the boat is the total length of the bow to the straight line connecting the extreme points of the inflatable sides.

Cavitation - the formation in water of cavities (cavitation bubbles, or caverns) filled with gas, steam, or a mixture thereof. Cavitation occurs as a result of a local decrease in pressure in the water, which occurs with increasing water velocity. Moving with the flow to a region with a higher pressure, the cavitation bubble closes, emitting a shock wave.

Wedge-shaped section - a section containing at least one upper inclined surface and at least 2 side surfaces (side walls), conjugated with the upper inclined surface. Thus, this section in longitudinal section has a shape close to the shape of a wedge. Moreover, the upper inclined surface and the side surfaces (side walls) can be made curved, for example, convex.

Aft end of the bottom - the vertical or inclined surface of the inflatable bottom, located in the stern of the inflatable motor boat.

The bottom surface of the inflatable bottom - the surface located at the bottom of the inflatable bottom, and in contact with the plane of the water surface during the movement of the inflatable motor boat.

The engine leg is an element of a boat outboard engine inside which the engine is connected to the propeller; the leg length is the distance from the upper engine mounting point on the transom to the anti-cavitation plate located directly above the outboard screw.

Essentially, an arcuate shape is the shape of an object that is close to or similar to an arc. In particular, the inner surface of the tunnel has an essentially arched shape, which is associated, on the one hand, with the fact that the angle of inclination of the tangent to the side wall of the tunnel with respect to the plane of the water surface can be no more than 45 ° from the vertical. In this inflated state, the shape of the side walls and the upper inclined surface of the tunnel becomes rounded. On the other hand, in view of the structural features of the boat, namely the fact that the elements of the inflatable bottom are interconnected by seams, the junction of the side walls and the upper inclined surface of the tunnel are small natural recesses. Thus, the shape of the inner surface of the tunnel is round and close in cross section to the arc due to the roundness of the side walls of the tunnel and the upper inclined surface of the tunnel, and, at the same time, the natural surface of the tunnel is characterized by natural depressions due to the connection of the bottom elements using seams.

U-shaped - similar to the letter P.

Sinusoidal shape - the shape of an object close to a sinusoid with constant or variable amplitude.

Transom - in the case of inflatable boats, a board mounted vertically-transversely and fixed in the stern of the boat for mounting an outboard on it.

Transom plate - a rigid plate of variable thickness, of any possible shape, mechanically attached to the bottom of the inflatable bottom in its aft.

Trapezoidal - shaped like a trapezoid.

The terminology used here is not intended to limit the embodiments of the invention, but only serves the purpose of describing a particular implementation. The use of the singular form also implies the implementation of the plural, if not contrary to the context.

SUMMARY OF THE INVENTION

The task to which the invention is directed, is to expand the operational characteristics of inflatable motor boats.

The technical result of the claimed invention is the possibility of highly efficient operation of the boat at shallow and ultra shallow depths at different speeds due to the presence of a longitudinal inclined tunnel, with some implementation details in different versions, which allows to improve the water supply to the outboard propellers of outboard engines or, in the case of jet engines, their water intakes, optimize their location and eliminate the risk of damage to them.

The claimed technical result is achieved by the fact that the invention is an inflatable motor boat with a hull of a U-shape in plan. The hull of an inflatable motor boat is formed by an open loop of inflatable sides and bow. An inflatable bottom is connected to the body, divided into at least three longitudinal segments. A longitudinal tunnel is made in the middle segment of the bottom, the inner surface of which has a substantially arcuate shape. The tunnel includes a wedge-shaped section in a vertical section, the angle of inclination of the section to the plane of the water surface is from 5 ° to 45 °. The tunnel may also include an additional section with an angle of inclination from 0 ° to 20 ° to the plane of the water surface, the length of the additional section being less than the length of the section of a wedge-shaped shape.

This design of the tunnel provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel during the movement of the inflatable motor boat. Initially, water enters a longitudinal inclined tunnel having a substantially arched shape in cross section. Then the water flow changes the angle of inclination at the junction of the wedge-shaped section of the tunnel and in some versions of the additional section of the tunnel. Thus, the possibility of disruption of the flow of water at the inflection points is excluded.

This movement of the water flow inside a longitudinal inclined tunnel containing a wedge-shaped section and, possibly, an additional section ensures a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller without the formation of turbulence in the location of the screw, due to that the motion vector of the water flow at the exit from the inclined tunnel, conjugated with the aft end, passes through the axis of rotation of the propeller. Due to the fact that the inner surface of the longitudinal tunnel has a substantially arcuate shape, sticking of the water flow inside the tunnel when moving the boat, which in turn provides a rise in the water flow inside the tunnel, as well as the necessary density of the water flow for trouble-free operation of the outboard. Thus, such a movement of the water flow inside a longitudinal inclined tunnel, the inner surface of which is essentially arcuate and containing a wedge-shaped section and an additional section, ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

The proposed configuration of one of the possible embodiments of the claimed invention allows the outboard propeller to be positioned so that the speed vector of the inflatable motor boat coincides with the outboard motor driving vector and the propeller rotation axis, respectively, and is directed to the center of mass of the inflatable motor boat. This leads to a smooth movement of the inflatable motor boat and eliminates the effect of the boat oscillating in a vertical plane during movement, for example, at the time of going on planing. It follows that this configuration is optimal for the location of the outboard propeller, which eliminates the risk of damage to the propeller and improves the efficiency of use of the boat in shallow water.

In the claimed invention, the width of the tunnel along the interface line with the aft end of the inflatable bottom can be from 20 to 60 cm. This width of the tunnel ensures uniform movement of water inside the tunnel during the movement of the boat. The length of the tunnel can be from 5 to 50% of the entire length of the boat. This length of the tunnel, on the one hand, ensures the formation of a water flow and its supply at the required angle upward, and on the other hand, ensures the directional stability of the boat.

At the same time, the angle of inclination of the tangent to the side wall of the tunnel can be no more than 45 ° from the vertical. This allows you to make the side walls of the tunnel so that the width of the tunnel in cross section decreases in the direction from the plane of the water surface to the upper inclined surface of the tunnel, conjugated with its side walls. This configuration allows you to raise the flow of water inside the tunnel during the movement of the inventive inflatable boat and to provide the necessary density of the water flow for trouble-free operation of the outboard.

As a possible embodiment of the invention, the inflatable bottom may be flat or may be provided with a keel.

The claimed technical result is also achieved by the fact that the invention is an inflatable motor boat with a hull of a U-shape in plan. The hull of an inflatable motor boat is formed by an open loop of inflatable sides and bow. An inflatable bottom is connected to the body, divided into at least three longitudinal segments. A longitudinal tunnel is made in the middle segment of the bottom, which includes a wedge-shaped section in a vertical section. The aft end face of the bottom, coupled with the tunnel, is made inclined and forms an angle of less than 90 ° with respect to the plane of the water surface.

This design of the tunnel, coupled with an inclined stern end, provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel and, then, along the inclined stern end during the movement of the inflatable motor boat. Initially, water enters the longitudinal inclined tunnel containing a wedge-shaped section. Then the water flow changes the angle of inclination on the interface line of the inclined tunnel with the inclined aft end of the inflatable bottom. Thus, the possibility of disruption of the flow of water at the inflection points is excluded.

This movement of the water flow inside a longitudinal inclined tunnel containing a wedge-shaped section, and along the inclined aft end, provides a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller without the formation of turbulence in the location of the screw, due to that the motion vector of the water flow at the exit of the inclined tunnel along the inclined stern end passes through the axis of rotation of the propeller. Also, the movement of the water flow inside a longitudinal inclined tunnel containing a wedge-shaped section, and then along the inclined aft end, ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

The proposed configuration of another possible embodiment of the invention allows the outboard propeller to be positioned so that the speed vector of the inflatable motor boat coincides with the outboard motor driving vector and the propeller rotation axis, respectively, and is directed to the center of mass of the inflatable motor boat. This leads to a smooth movement of the inflatable motor boat and eliminates the effect of the boat oscillating in a vertical plane during movement, for example, at the time of going on planing. It follows that this configuration is optimal for the location of the outboard propeller, which eliminates the risk of damage to the propeller and improves the efficiency of use of the boat in shallow water.

In this case, the lower corners of the aft end can be made rounded. In the claimed invention, the depth of the tunnel on the interface line with the aft end of the inflatable bottom can be from 2 to 25 cm. This width of the tunnel ensures uniform movement of water inside the tunnel during the movement of the boat. The width of the tunnel along the line connecting with the aft end of the inflatable bottom can be from 20 to 60 cm.This length of the tunnel, on the one hand, ensures the formation of a water flow and its supply at the required angle upward, and on the other, ensures the course stability of the boat. At the same time, the angle of inclination of the wedge-shaped section of the tunnel to the plane of the water surface is from 5 ° to 45 °. This angle of inclination of the wedge-shaped section of the tunnel ensures the formation of a water flow and its effective supply at the required angle upward, without the occurrence of turbulence.

As a possible embodiment of the invention, the inflatable bottom may be flat or may be provided with a keel.

The claimed technical result is also achieved by the fact that the invention is an inflatable motor boat with a hull of a U-shape in plan. The hull of an inflatable motor boat is formed by an open loop of inflatable sides and bow. An inflatable bottom is connected to the body, divided into at least three longitudinal segments. A longitudinal tunnel is made in the middle segment of the bottom. The aft end face of the bottom is made inclined. In the inflatable bottom during the longitudinal tunnel, at least two water channels of variable depth are made.

This design of an inflatable motor boat containing at least two water channels connected to an inclined tunnel coupled to an inclined aft end provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface when moving from water channels to the tunnel, and then, along the inclined stern end during the movement of the inflatable motor boat. First, water enters the water channels, after which it continues to move inside a longitudinal inclined tunnel containing a wedge-shaped section. Then, the water flow changes the angle of inclination at the interface line between the tunnel and the aft end of the inflatable bottom. Thus, the possibility of disruption of the flow of water at the inflection points is excluded.

This movement of the water flow inside the water channels and a longitudinal inclined tunnel containing a wedge-shaped section, and then along the inclined aft end, provides a smooth direction of water movement at an upward angle and its supply in the required quantity to the outboard propeller without forming at the location screw turbulence phenomena. Also, such a movement of the water flow inside the water canals and a longitudinal inclined tunnel containing a wedge-shaped section, and then along the inclined aft end, ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in conditions shallow water.

The proposed configuration of another possible embodiment of the claimed invention also allows you to position the outboard propeller in such a way that the speed vector of the inflatable motor boat coincides with the outboard motor driving force vector and the propeller rotation axis, respectively, and is directed to the center of mass of the inflatable motor boats. This leads to a smooth movement of the inflatable motor boat and eliminates the effect of the boat oscillating in a vertical plane during movement, for example, at the time of going on planing. It follows that this configuration is optimal for the location of the outboard propeller, which eliminates the risk of damage to the propeller and improves the efficiency of use of the boat in shallow water.

The water channels in the framework of the claimed invention can be made by continuing the articulation lines of adjacent segments of the inflatable bottom. At the same time, the water channel in the longitudinal section may have a sinusoidal shape. The supply of the inflatable bottom with water channels provides the direction of water flow in the direction of the tunnel when moving the boat. This effect occurs due to the fact that when the boat moves, water sticks inside the water channel when the boat moves, and then it is fed into the free volume of the tunnel. At the same time, water falling into the tunnel is discharged, since the tunnel with the water channels in the first part has a concave shape, this makes it easier to move, the water is torn off from the body in the middle. After that, the tunnel has a curved arcuate shape, along which water has the ability to rise up, significantly higher than the usual level of the water surface.

The aft end face of the bottom, coupled with a longitudinal tunnel, can be made inclined, with an angle of less than 90 ° with respect to the plane of the water surface. The longitudinal tunnel, in turn, may include a wedge-shaped portion in a vertical section. Both of these constructive solutions make it possible to form a water flow directed at a necessary angle upward towards the outboard propeller without causing turbulence in the outboard propeller region.

In the claimed invention, the depth of the tunnel on the interface line with the aft end face of the inflatable bottom can be from 2 to 25 cm. The width of the tunnel along the interface line with the aft end face of the inflatable bottom can be from 20 to 60 cm. This tunnel width ensures uniform movement of water inside the tunnel in the process boat movements. This length of the tunnel, on the one hand, ensures the formation of a water flow and its supply at the required angle upward, and on the other hand, ensures the directional stability of the boat. The angle of inclination of the tunnel to the plane of the water surface can be from 5 ° to 45 °. This angle of inclination of the wedge-shaped section of the tunnel ensures the formation of a water flow and its effective supply at the required angle upward, without the occurrence of turbulence. The total length of the tunnel and the water channel connected to it can be from 20 to 380 cm. These dimensions are due to a number of practical experiments in real conditions.

The indicated designs are applicable both to keeled boats and flat bottoms.

Description of drawings

The essence of the proposed technical solution is illustrated by drawings.

In FIG. 1 is a top view of an inflatable motor boat.

In FIG. 2 is a bottom view of an inflatable motor boat, and FIG. 3 - side view of the boat.

In FIG. 4 shows a view of an inflatable motor boat from the stern.

In FIG. 5 shows a section of an inflatable motor boat along line A - A, in which the inclined tunnel 3 is provided with a wedge-shaped section and an additional section 9.

In FIG. 6 shows an inflatable motor boat equipped with transom plates 8, a top view.

In FIG. 7 shows a section of an inflatable motor boat along line B - B.

In FIG. 8 shows a section of an inflatable motor boat along line C - C.

In FIG. 9 shows a section of an inflatable motor boat along the line D - D.

In FIG. 10 shows a region E, which shows transom plates 8.

In FIG. 11 shows an inflatable motor boat equipped with transom plates 8, bottom view.

In FIG. 12 is a view from the bow 11 of an inflatable motor boat.

In FIG. 13 shows a section of an inflatable motor boat equipped with water channels 6 along the line F - F.

In FIG. 14 shows a section of an inflatable motor boat along the line G - G, on which an inclined aft end 4 is visible.

In FIG. 15 shows a section of an inflatable motor boat along the line H - H.

In FIG. 16 shows a section of an inflatable motor boat along the line I - I.

In FIG. 17 shows region J, which shows transom plates 8 and an inclined aft end 4.

In FIG. 18 shows an inflatable motor boat equipped with water channels 6, bottom view,

Features of the invention are disclosed in the following description and the attached images illustrating the invention. In the framework of this invention can be developed alternative options for its implementation. In addition, well-known elements of the invention will not be described in detail or will be omitted so as not to overload the description of the present invention in detail.

DETAILED DESCRIPTION OF THE INVENTION

As indicated in FIG. 1 to 4, an inflatable motor boat in the framework of the present invention comprises a hull 1, an inflatable bottom 2 with a tunnel 3 and a stern end 4 (as shown in FIG. 4), a transom 5 for installing an outboard with a propeller (not shown in the drawing). Instead of an outboard with a propeller, a water jet engine with a water intake can be installed (not shown in the drawing).

As shown in FIG. 1 (top view of the inflatable motor boat), the hull 1 of the inflatable motor boat is formed by an open loop of the inflatable sides 10 and the bow 11. As shown in FIG. 2 and FIG. 3, the inflatable bottom 2 is attached to the housing 1. The inflatable bottom 2 can be attached to the housing 1 by any method known in the art, for example, glued, sewn, secured by lacing or soldered. As shown in FIG. 4, the aft end 4 is made from the stern in the inflatable bottom 2. In this case, the length of the bottom 2 from the bow 11 to the aft end 4 is less than the length of the inflatable sides 10 of the housing 1, as shown in FIG. 1 and FIG. 2. Thus, the extreme points of the inflatable sides 10 of the hull 1 are located farther from the bow 11 of the inflatable motor boat than the aft end 4 of the inflatable bottom 2. This configuration allows the boat to move in shallow water, since the outboard propeller (not shown in the drawing) located above the bottom surface of the inflatable bottom 2.

As shown in FIG. 2, the lower surface 15 of the inflatable bottom 2 is divided into at least three longitudinal segments 12. The middle longitudinal segment 12 contains a tunnel 3. The tunnel 3 is made longitudinal. Tunnel 3 has at least three surfaces: the upper inclined surface of the tunnel 3 and the associated side walls 13 of the tunnel 3. The upper inclined surface of the tunnel 3 can form an angle from 5 ° to 45 ° with the water surface. The tunnel 3 itself is designed so that its depth decreases in the direction from the aft end 4 to the bow 11 of the inflatable motor boat, as shown in FIG. 5. Moreover, as shown in FIG. 5, the tunnel 3 includes a section having a wedge-shaped in vertical section. The execution of the tunnel 3 longitudinal, as shown in FIG. 5, allows water to fill the free volume of the tunnel 3 during the movement of the inflatable motor boat with minimal resistance from the water. This result is achieved in that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the speed vector of the inflatable boat during its movement, as shown in FIG. 2 and FIG. 4. The implementation of the tunnel 3 in the middle longitudinal segment 12 of the inflatable bottom 2 ensures the stability of the boat during movement.

As shown in FIG. 2, which shows a view of an inflatable motor boat from below and in FIG. 4, illustrating the view of the inflatable motor boat from the stern, the plane of symmetry of the longitudinal inclined tunnel 3 coincides with the vertical plane of symmetry of the hull 1, made U-shaped in plan. The implementation of the housing 1 U-shaped in plan, in turn, is shown in FIG. 1. In this case, the depth of the inclined tunnel 3 decreases in the direction from the aft end 4 located in the aft of the boat to its bow 11. Such a decrease in the depth of the inclined tunnel 3 is illustrated by cross sections along lines C - C and D - D shown in FIG. 8 and FIG. 9, respectively. The section along the line D - D (Fig. 9) is located farther from the aft end 4 towards the bow of the boat 11 than the section along the line C - C (Fig. 8), and, naturally, the depth of the inclined tunnel 3 in Fig. 9 is less than the depth of the inclined tunnel 3 in FIG. 8.

Reducing the depth of the inclined tunnel 3 in the direction from the aft end 4 to the bow 11 of the inflatable motor boat and the execution of the inclined tunnel 3 longitudinally ensures a smooth direction of water movement at an upward angle and its supply in the required quantity to the outboard propeller (not shown in the drawing) without the formation at the location of the screw (not shown in the drawing) the phenomenon of turbulence. This is achieved by filling the free volume of the tunnel 3 with water during the movement of the inflatable motor boat with minimal resistance from the water side, due to the fact that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the velocity vector inflatable boat during its movement. Accordingly, the water flow at the exit from the tunnel 3 has a direction at an angle upward and enters the outboard propeller (not shown in the drawing) located so that the motion vector of the water flow at the exit of the inclined tunnel 3 passes through the axis of rotation of the propeller (not shown in the drawing).

As shown in FIG. 5, as a possible implementation of the present invention, the tunnel 3 includes a section having a wedge-shaped in vertical section. The tunnel 3 may also include an additional section 9 with an angle of inclination from 0 ⁰ to 20 ° with respect to the plane of the water surface and the lower surface 15 of the inflatable bottom 2, respectively. An additional section 9 is located between the section having a wedge-shaped in vertical section and the aft end 4, as shown in longitudinal section along line A - A in FIG. five.

The position of the additional section 9 in the longitudinal inclined tunnel 3 relative to the aft end 4 is also shown in FIG. 2. Moreover, the length of the additional section 9 is less than the length of the section having a wedge-shaped shape in a vertical section. Thus, the upper inclined surface of the tunnel 3 has a variable angle of inclination with respect to the surface of the water, that is, a decrease in the depth of the longitudinal inclined tunnel 3 in the direction from the aft end 4 to the bow 11 of the boat is made uneven. The inclination angle of the additional section 9 cannot be more than 20 ° with respect to the plane of the water surface and the lower surface 15 of the inflatable bottom 2, respectively.

This design of the tunnel 3, equipped with a wedge-shaped section and an additional section 9 and associated with the aft end 4 provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel 3 during the movement of the inflatable motor boat. Initially, water enters the longitudinal inclined tunnel 3, namely, a wedge-shaped section. Then the water flow changes the angle of inclination at the junction of the wedge-shaped section of the tunnel 3 and the additional section 9 of the tunnel 3. Thus, the possibility of disruption of the water flow at the inflection points is excluded.

Such a movement of water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section and an additional section 9 provides a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller (not shown in the drawing) without forming a screw (not shown in the drawing) of the phenomenon of turbulence, due to the fact that the motion vector of the water flow at the exit of the inclined tunnel 3, coupled with the aft end 4, passes through the axis of rotation of the propeller (not shown in the drawing). Also, such a movement of the water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section and an additional section 9 ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

As shown in FIG. 4, the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the plane of the water surface can be no more than 45 ° from the vertical. This allows you to make the side walls 13 so that the width of the tunnel 3 in cross section decreases in the direction from the bottom surface 15 of the inflatable bottom 2 to the upper inclined surface of the tunnel 3, conjugated with its side walls 13. This configuration allows you to raise the flow of water inside the tunnel 3 in the course of movement of the inventive inflatable boat and to provide the necessary density of water flow for trouble-free operation of the outboard engine (not shown in the drawing).

Due to the fact that the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the plane of the water surface can be no more than 45 ° from the vertical, the inner surface of the tunnel 3 has a substantially arcuate shape, since the shape of the side walls 13 and the upper the inclined surface of the tunnel 3 becomes rounded. Accordingly, the cross-sectional shape of the inner surface of the tunnel 3 is substantially arched, as shown in FIG. 4. Nevertheless, in view of the structural features of the boat, namely the fact that the elements of the bottom 2 are interconnected by means of seams 18, the junction of the side walls 13 and the upper inclined surface of the tunnel 3 are small natural recesses. This feature is manifested throughout the longitudinal tunnel 3, including on the interface line 14 of the aft end 4 and the longitudinal tunnel 3. The presence of seams 18 in the design of the claimed invention ensures reliable connection of the parts of the material from which the inflatable bottom 2 is made.

The fact that the inner surface of the longitudinal tunnel 3 has a substantially arcuate shape ensures sticking of the water flow inside the tunnel when moving the boat, and therefore, the effective supply of water from the tunnel 3 to the outboard screw (not shown in the drawing).

The shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 containing the wedge-shaped portion has a substantially arcuate shape, as shown in FIG. 4. However, in view of the above-described features of connecting the elements of the inflatable bottom 2 using seams 18, the shape of the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal or U-shaped, which is seen from the stern in FIG. 4. In this case, the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal when the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the plane of the water surface is from 0 ° to 45 ° from the vertical. If the tangent to the side wall 13 of the tunnel 3 is perpendicular to the plane of the water surface, that is, the angle of inclination of the tangent is 0 ° from the vertical, the shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 can be made U-shaped.

At the same time, the portion of the interface line 14, adjacent to the inclined plane of the longitudinal tunnel 3, can be curved towards the plane of the water surface and the lower surface 15 of the inflatable bottom 2, respectively. This makes it possible to raise the water flow and provide the necessary water flow density for trouble-free operation of the outboard engine (not shown in the drawing), which ensures high efficiency of the use of an inflatable boat in shallow water.

In this case, the side walls 13 of the inclined tunnel 3 can be made convex in the direction of the free volume, as shown in FIG. 4. This makes it possible to additionally increase the flow of water inside the tunnel 3 and provide the necessary density of the flow of water for trouble-free operation of the outboard engine (not shown in the drawing).

The lower surface 15 of the inflatable bottom 2, namely, the surface located in the lower part of the inflatable bottom 2 and in contact with the plane of the water surface during the movement of the inflatable motor boat, may include longitudinal grooves 7, as shown in FIG. 2 and FIG. 4. The presence of longitudinal grooves 7 in the design of the lower surface 15 of the inflatable bottom 2 with the location on the lower surface 15 of the seams 18 connecting the parts of the material from which the inflatable bottom is made 2. The presence of seams 18 in the design of the claimed invention ensures the reliability of the connection of the parts of the material of which it is made inflatable bottom 2. As shown in FIG. 8 and FIG. 9, each of which shows the appearance from the stern of the cuts along the lines C - C and D - D, respectively, the seams 18 are located vertically inside the inflatable bottom 2. Also, the seams 18 inside the inflatable bottom 2 can be inclined, which also reflected in FIG. 8 and FIG. 9. Accordingly, in the inflated condition, the presence of seams 18 on the lower surface 15 of the inflatable bottom 2 will lead to the formation of longitudinal grooves 7, as shown in FIG. 9, where the longitudinal grooves 7 are located at the junction of the vertical and inclined seams 18 with the lower surface 15 of the inflatable bottom 2.

As shown in FIG. 5, in the claimed invention, transom 5 can be installed on the upper surface 16 of the inflatable bottom 2 above the aft end 4. In turn, an outboard with a propeller (not shown in the drawing) can be installed on the transom 5. This design of the inflatable boat allows the use of outboard engines with a shorter "foot" (381 mm) and to position the propeller (not shown in the drawing) closer to the plane of the water surface, above the stern draft of the boat itself. At the same time, the overall depth of the ship's immersion in water is reduced, which makes it possible to operate it on the shallows, at low water, etc.

The inflatable bottom 2 can be made of any known design. As an example, the inflatable bottom 2 may be flat, or may be provided with a keel 17. An embodiment of an inflatable boat equipped with a keel 17 is shown in FIG. 3, which shows a side view of an inflatable boat.

The possibility of using outboard engines with a shorter “foot” (381 mm) is provided by the design of the tunnel 3, equipped with a wedge-shaped section and an additional section 9 and conjugated with the aft end 4 provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel 3 during the movement of the inflatable motor boat. Initially, water enters the longitudinal inclined tunnel 3, namely, a wedge-shaped section. Then the water flow changes the angle of inclination at the junction of the wedge-shaped section of the tunnel 3 and the additional section 9 of the tunnel 3. Thus, the possibility of disruption of the water flow at the inflection points is excluded.

Such a movement of water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section and an additional section 9 provides a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller (not shown in the drawing) without forming a screw (not shown in the drawing) of the phenomenon of turbulence, due to the fact that the motion vector of the water flow at the exit of the inclined tunnel 3, coupled with the aft end 4, passes through the axis of rotation of the propeller (not shown in the drawing). Also, such a movement of the water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section and an additional section 9 ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

As one of the possible options, the claimed invention is implemented as follows.

As shown in FIG. 7, the inflatable motor boat within the framework of this embodiment of the invention comprises a hull 1, an inflatable bottom 2 with a tunnel 3 and aft end 4, transom 5. An outboard engine with a propeller (not shown in the drawing) is mounted on the inflatable boat. Instead of an outboard with a propeller (not shown in the drawing), a water jet engine with a water intake (not shown in the drawing) can be installed.

As shown in FIG. 6 (inflatable motor boat equipped with an inclined stern end 4, top view), the hull 1 of the inflatable motor boat is formed by an open loop of the inflatable sides 10 and the bow 11. As shown in FIG. 7 - FIG. 9, the inflatable bottom 2 is attached to the housing 1. The inflatable bottom 2 can be attached to the housing 1 by any method known in the art, for example, glued, sewn, secured with lacing or soldered. As shown in FIG. 7, from the stern end in the inflatable bottom 2, the aft end 4 is made. The aft end 4 can be made with rounded corners, oval, in addition, it can be reinforced, that is, it can be multilayer or have a plate (not shown) in the place where the incoming water flow .

The length of the bottom 2 from the bow 11 to the aft end 4 is less than the length of the inflatable sides 10 of the housing 1, which is shown in FIG. 6, FIG. 7 (longitudinal section of the boat along line B - B) and in FIG. 11 (inflatable motor boat equipped with an inclined stern end 4, bottom view). Thus, the extreme points of the inflatable sides 10 of the hull 1 are located farther from the bow 11 of the inflatable motor boat than the aft end 4 of the inflatable bottom 2. This configuration is inherent in any embodiment of the claimed invention and allows the boat to move in shallow water, since the outboard propeller of the outboard engine (not shown in the drawing) is located above the bottom surface 15 of the inflatable bottom 2.

As shown in FIG. 11, the lower surface 15 of the inflatable bottom 2 is divided into at least three longitudinal segments 12. The middle longitudinal segment 12 contains a tunnel 3. The tunnel 3 is made longitudinal. Tunnel 3 has at least three surfaces: the upper inclined surface of the tunnel 3 and the associated side walls 13 of the tunnel 3. The upper inclined surface of the tunnel 3 can form an angle from 5 ° to 45 ° with the plane of the water surface. The tunnel 3 itself is designed so that its depth decreases in the direction from the aft end 4 to the bow 11 of the inflatable motor boat, as shown in FIG. 7. Moreover, as shown in FIG. 7, the tunnel 3 includes a section having a wedge-shaped in vertical section. The execution of the tunnel 3 longitudinal, as shown in FIG. 7, allows water to fill the free volume of the tunnel 3 during the movement of the inflatable motor boat with minimal resistance from the water. This result is achieved in that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the speed vector of the inflatable boat during its movement, as shown in FIG. 8 and FIG. 11. The implementation of the tunnel 3 in the middle longitudinal segment 12 of the inflatable bottom 2 ensures the stability of the boat during movement.

As shown in FIG. 8, illustrating a section of an inflatable motor boat equipped with an inclined stern end 4, along lines C - C and in FIG. 11, which shows a bottom view of an inflatable motor boat, the plane of symmetry of the longitudinal inclined tunnel 3 coincides with the vertical plane of symmetry of the hull 1, made U-shaped in plan. The implementation of the housing 1 U-shaped in plan, in turn, is shown in FIG. 6. In this case, the depth of the inclined tunnel 3 decreases in the direction from the aft end 4 located in the aft of the boat to its bow 11. Such a decrease in the depth of the inclined tunnel 3 is illustrated by cross sections along lines C - C and D - D shown in FIG. 8 and FIG. 9, respectively. The section along the line D - D (Fig. 9) is located farther from the aft end 4 towards the bow of the boat 11 than the section along the line C - C (Fig. 8), and, naturally, the depth of the inclined tunnel 3 in Fig. 9 is less than the depth of the inclined tunnel 3 in FIG. 8.

Reducing the depth of the inclined tunnel 3 in the direction from the aft end 4 to the bow 11 of the inflatable motor boat and the execution of the inclined tunnel 3 longitudinally ensures a smooth direction of water movement at an upward angle and its supply in the required quantity to the outboard propeller (not shown in the drawing) without the formation at the location of the screw (not shown in the drawing) the phenomenon of turbulence. This is achieved by filling the free volume of the tunnel 3 with water during the movement of the inflatable motor boat with minimal resistance from the water side, due to the fact that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the velocity vector inflatable boat during its movement. Accordingly, the water flow at the exit from the tunnel 3 has a direction at an angle upward and enters the outboard propeller (not shown in the drawing) located so that the motion vector of the water flow at the exit of the inclined tunnel 3 passes through the axis of rotation of the propeller (not shown in the drawing).

In the framework of this embodiment of the claimed invention, the aft end 4 of the inflatable bottom 2 can be made inclined. In this case, the angle of inclination of the aft end 4 is less than 90 ° to the plane of the water surface and to the lower surface 15 of the inflatable bottom 2, respectively, as shown in FIG. 7. In turn, the inclined aft end 4 is interfaced with the longitudinal inclined tunnel 3, as shown in FIG. 7, and a longitudinal inclined tunnel 3 containing a wedge-shaped portion is located in the middle segment 12 of the inflatable bottom 2, as can be seen in FIG. eleven.

This design of the tunnel 3, coupled with an inclined stern end 4, provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel 3 and, then, along the inclined stern end 4 during the movement of the inflatable motor boat. Initially, water enters the longitudinal inclined tunnel 3 containing a wedge-shaped section. Then the water flow changes the angle of inclination at the interface line 14 of the inclined tunnel 3 with the inclined aft end 4 of the inflatable bottom 2. Thus, the possibility of disruption of the water flow at the inflection points is eliminated.

This movement of the water flow inside the longitudinal inclined tunnel 3 containing the wedge-shaped section, and along the inclined aft end 4 provides a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller (not shown in the drawing) without formation at the location screw (not shown in the drawing) the phenomenon of turbulence, due to the fact that the vector of motion of the water flow at the exit of the inclined tunnel 3 along the inclined aft end 4, passes through the axis of rotation of the propeller (not shown in the drawing). Also, such a movement of the water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section, and then along the inclined aft end 4, ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

As shown in FIG. 8, the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the surface of the water can be no more than 45 ° from the vertical. This allows you to make the side walls 13 so that the width of the tunnel 3 in cross section decreases in the direction from the bottom surface 15 of the inflatable bottom 2 to the upper inclined surface of the tunnel 3, conjugated with its side walls 13. This configuration allows you to raise the flow of water inside the tunnel 3 in the course of movement of the inventive inflatable boat and to provide the necessary density of water flow for trouble-free operation of the outboard engine (not shown in the drawing).

Due to the fact that the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the water surface can be no more than 45 ° from the vertical, the inner surface of the tunnel 3 has a substantially arcuate shape, since in the inflated state the shape of the side walls 13 and the upper inclined the surface of the tunnel 3 becomes rounded. Accordingly, the cross-sectional shape of the inner surface of the tunnel 3 is substantially arched, as shown in FIG. 8. Nevertheless, in view of the structural features of the boat, namely the fact that the elements of the bottom 2 are interconnected by means of seams 18, the junction of the side walls 13 and the upper inclined surface of the tunnel 3 are small natural recesses. This feature is manifested throughout the longitudinal tunnel 3, including on the interface line 14 of the aft end 4 and the longitudinal tunnel 3. The presence of seams 18 in the design of the claimed invention ensures reliable connection of the parts of the material from which the inflatable bottom 2 is made.

The shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 containing the wedge-shaped portion has a substantially arcuate shape, as shown in FIG. 8. However, in view of the above-described features of connecting the elements of the inflatable bottom 2 by means of seams 18, the shape of the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal or U-shaped, which is seen from the stern in FIG. 8. In this case, the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal when the angle of inclination of the tangent to the side wall 13 of the tunnel 3 relative to the plane of the water surface is from 0 ° to 45 ° from the vertical. If the tangent to the side wall 13 of the tunnel 3 is perpendicular to the plane of the water surface, that is, the angle of inclination of the tangent is 0 ° from the vertical, the shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 can be made U-shaped.

At the same time, the section of the interface line 14, adjacent to the inclined plane of the longitudinal tunnel 3, can be bent towards the plane of the lower surface 15 of the inflatable bottom 2. This makes it possible to raise the water flow and provide the necessary water flow density for trouble-free operation of the outboard engine (not shown in the drawing), which ensures high efficiency of the use of an inflatable boat in shallow water.

The fact that the inner surface of the longitudinal tunnel 3 has a substantially arcuate shape ensures sticking of the water flow inside the tunnel when moving the boat, and therefore, the effective supply of water from the tunnel 3 to the outboard screw (not shown in the drawing).

In this case, the side walls 13 of the inclined tunnel 3 can be made convex in the direction of the free volume, as shown in FIG. 8. This makes it possible to additionally increase the flow of water inside the tunnel 3 and provide the necessary density of the flow of water for trouble-free operation of the outboard engine (not shown in the drawing).

The lower surface 15 of the inflatable bottom 2, namely, the surface located in the lower part of the inflatable bottom 2 and in contact with the plane of the water surface during the movement of the inflatable motor boat, may include longitudinal grooves 7, as shown in FIG. 9 and FIG. 11. The presence of longitudinal grooves 7 in the design of the lower surface 15 of the inflatable bottom 2 with the location on the lower surface 15 of the seams 18 connecting the parts of the material from which the inflatable bottom is made 2. The presence of seams 18 in the design of the claimed invention ensures the reliability of the connection of the parts of the material of which it is made inflatable bottom 2. As shown in FIG. 8 and FIG. 9, each of which shows the appearance from the stern of the cuts along the lines C - C and D - D, respectively, the seams 18 are located vertically inside the inflatable bottom 2. Also, the seams 18 inside the inflatable bottom 2 can be inclined, which also reflected in FIG. 8 and FIG. 9. Accordingly, in the inflated condition, the presence of seams 18 on the lower surface 15 of the inflatable bottom 2 will lead to the formation of longitudinal grooves 7, as shown in FIG. 9, where the longitudinal grooves 7 are located at the junction of the vertical and inclined seams 18 with the lower surface 15 of the inflatable bottom 2.

As shown in FIG. 7, in the claimed invention, the transom 5 is mounted on the upper surface 16 of the inflatable bottom 2 above the aft end 4. In turn, the transom 5 is mounted on an outboard with a propeller (not shown in the drawing). This design of the inflatable boat allows the use of outboard engines with a shorter "foot" (381 mm) and to position the propeller (not shown in the drawing) closer to the plane of the water surface, above the stern draft of the boat itself. At the same time, the overall depth of the ship's immersion in water is reduced, which makes it possible to operate it on the shallows, at low water, etc.

The possibility of using outboard engines with a shorter “foot” (381 mm) is provided by the design of the tunnel 3, paired with an inclined aft end 4, which provides a gradual change in the angle of inclination of the water flow relative to the plane of the water surface inside the tunnel 3 and then along the inclined aft end 4 in the process of moving an inflatable motor boat. Initially, water enters the longitudinal inclined tunnel 3 containing a wedge-shaped section. Then the water flow changes the angle of inclination at the interface line 14 of the inclined tunnel 3 with the inclined aft end 4 of the inflatable bottom 2. Thus, the possibility of disruption of the water flow at the inflection points is eliminated.

This movement of the water flow inside the longitudinal inclined tunnel 3 containing the wedge-shaped section, and along the inclined aft end 4 provides a smooth direction of water movement at an angle upward and its flow in the required quantity to the outboard propeller (not shown in the drawing) without formation at the location a screw (not shown in the drawing) turbulence phenomena. Also, such a movement of the water flow inside a longitudinal inclined tunnel 3 containing a wedge-shaped section, and then along the inclined aft end 4, ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

This configuration allows you to position the outboard propeller (not shown in the drawing) so that the speed vector of the inflatable motor boat coincides with the outboard motor driving vector (not shown in the drawing), and the axis of rotation of the propeller (not shown in the drawing), respectively , and was directed to the center of mass of the inflatable motor boat. This leads to a smooth movement of the inflatable motor boat and eliminates the effect of the boat oscillating in a vertical plane during movement, for example, at the time of going on planing. It follows that this configuration is optimal for the location of the outboard propeller (not shown in the drawing), which eliminates the risk of damage to the propeller (not shown in the drawing) and improves the efficiency of use of the boat in shallow water.

As shown in FIG. 7, the inflatable bottom 2 may be further provided with at least one transom plate 8. As an example, the transom plate 8 may be in the shape of a triangle, as shown in FIG. 11 (bottom view), and partially shown in FIG. 6 (top view).

As an example, the inflatable bottom 2 may be further provided with three transom plates 8, as shown in FIG. 11, the ribs of the transom plates 8 being located within the outer contour of the aft end 4 and the inflatable sides 10 of the housing 1. The location of the transom plates 8 is also illustrated in FIG. 10, namely, the region E, designated in the area of the aft end 4.

The supply of the inflatable bottom 2, at least one transom plate 8 avoids subsidence of the stern of the inflatable boat when the boat goes on planing, and to ensure stable movement of the inflatable motor boat. This aspect is important in the case of using the inventive inflatable motor boat in shallow water, as it helps to prevent damage to the outboard propeller (not shown in the drawing).

The inflatable bottom 2 can be made of any known design. As an example, the inflatable bottom 2 may be flat, or may be provided with a keel 17. An embodiment of an inflatable boat equipped with a keel 17 is shown in FIG. 3, which shows a side view of an inflatable boat.

As another possible option, the claimed invention is implemented as follows.

As shown in FIG. 14, an inflatable motor boat within the framework of this embodiment of the invention comprises a hull 1, an inflatable bottom 2 with a tunnel 3 and aft end 4, a transom (not shown in the drawing). An outboard engine with a propeller (not shown in the drawing) is installed on the inflatable boat. Instead of an outboard with a propeller, a water jet engine with a water intake can be installed (not shown in the drawing).

As shown in FIG. 18 (inflatable motor boat equipped with water channels 6, bottom view), the hull 1 of the inflatable motor boat is formed by an open loop of the inflatable sides 10 and the bow 11. As shown in FIG. 12 - FIG. 16, the inflatable bottom 2 is attached to the housing 1. The inflatable bottom 2 can be attached to the housing 1 by any method known in the art, for example, glued, sewn, secured using lacing or soldered. As shown in FIG. 13 and FIG. 14, the aft end 4 is formed on the stern side of the inflatable bottom 2. In this case, the length of the bottom 2 from the bow 11 to the aft end 4 is less than the length of the inflatable sides 10 of the housing 1, as shown in FIG. 13 (longitudinal section of the boat along the line F - F, side view), FIG. 14 (longitudinal section of the boat along the line G - G, side view) and in FIG. 18 (inflatable motor boat equipped with water channels 6, bottom view). Thus, the extreme points of the inflatable sides 10 of the hull 1 are located farther from the bow 11 of the inflatable motor boat than the aft end 4 of the inflatable bottom 2. This configuration allows the boat to move in shallow water, since the propeller (not shown in the drawing) of the outboard engine is located above the bottom surface 15 of the inflatable bottom 2.

As shown in FIG. 18, the lower surface 15 of the inflatable bottom 2 is divided into at least three longitudinal segments 12. The middle longitudinal segment 12 contains a tunnel 3. The tunnel 3 is made longitudinal. Tunnel 3 has at least three surfaces: the upper inclined surface of the tunnel 3 and the associated side walls 13 of the tunnel 3. The upper inclined surface of the tunnel 3 can form an angle from 8 ° to 42 ° with the plane of the water surface. The tunnel 3 itself is designed so that its depth decreases in the direction from the aft end 4 to the bow 11 of the inflatable motor boat, as shown in FIG. 14. Moreover, as shown in FIG. 7, the tunnel 3 includes a section having a wedge-shaped in vertical section. The execution of the tunnel 3 longitudinal, as shown in FIG. 14, allows water to fill the free volume of the tunnel 3 during the movement of the inflatable motor boat with minimal resistance from the water. This result is achieved in that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the speed vector of the inflatable boat during its movement, as shown in FIG. 15 (section along the line H - H, view from the stern) and FIG. 18. The implementation of the tunnel 3 in the middle longitudinal segment 12 of the inflatable bottom 2 ensures the stability of the boat during movement.

The lower surface 15 of the inflatable bottom 2, namely, the surface located in the lower part of the inflatable bottom 2 and in contact with the plane of the water surface during the movement of the inflatable motor boat, may include longitudinal grooves 7, as shown in FIG. 18. The presence of longitudinal grooves 7 in the design of the lower surface 15 of the inflatable bottom 2 with the location on the lower surface 15 of the seams 18 connecting the parts of the material from which the inflatable bottom is made 2. The presence of seams 18 in the design of the claimed invention ensures the reliability of the connection of the parts of the material of which it is made inflatable bottom 2. As shown in FIG. 15 and FIG. 16, each of which shows the appearance from the stern to the cuts along the lines H - H and I - I, respectively, the seams 18 are located vertically inside the inflatable bottom 2. Also, the seams 18 inside the inflatable bottom 2 can be inclined, which also reflected in FIG. 15 and FIG. 16. Accordingly, in the inflated condition, the presence of seams 18 on the lower surface 15 of the inflatable bottom 2 will lead to the formation of longitudinal grooves 7.

As shown in FIG. 13 (longitudinal section along the line F - F, side view), the inflatable bottom 2 of the boat can be additionally equipped with at least two water channels 6. Water channels 6 are longitudinal recesses in the inflatable bottom 2, the depth of which significantly exceeds the depth of the longitudinal grooves 7, the presence of which in the inflatable bottom is due to the geometry of the seams 18 connecting the parts of the material from which the inflatable bottom 2 is made.

In the case of supplying an inflatable motor boat with water channels 6, water channels 6 can be performed as follows. In such an embodiment of the claimed invention, the water channels 6 can be made as a continuation of the articulation lines of the side walls 13 of the tunnel 3 with the lower surface 15 of the inflatable bottom 2 and with the upper inclined surface of the tunnel 3, as shown in FIG. 18. Thus, as shown in FIG. 18, the water channels 6 are a continuation of the junction lines between the middle longitudinal segment 12 of the inflatable bottom 2 containing the tunnel 3 and the segments 12 of the inflatable bottom 2 adjacent to the middle segment 12. As shown in FIG. 14, the tunnel 3, in turn, contains a section having a wedge-shaped in vertical section. Moreover, the water channels 6 and the tunnel 3 have a total free volume. Structurally, the water channels 6 are located between the articulation line of the tunnel 3 with the lower surface 15 of the inflatable bottom 2 and the bow 11 of the boat, as shown in FIG. 13 and FIG. 18 (bottom view).

Moreover, in a longitudinal section along the line F - F, as shown in FIG. 13, the profile of the upper wall of the water channel 6, having a common free volume with the tunnel 3, has a variable depth and has a shape close to a sinusoid.

The supply of the inflatable bottom 2 with water channels 6 provides the direction of water flow in the direction of the tunnel 3 when moving the boat. This effect occurs due to the fact that when the boat moves, water sticks inside the water channel 6 when the boat moves, and then it is fed into the free volume of the tunnel 3.

As shown in FIG. 12, which shows a front view of the boat from the bow of the boat 11, FIG. 15, illustrating a section of an inflatable motor boat equipped with water channels 6, along the line H - H and in FIG. 18, where a bottom view of an inflatable motor boat is shown, the plane of symmetry of the longitudinal inclined tunnel 3 coincides with the vertical plane of symmetry of the hull 1, made U-shaped in plan. The implementation of the housing 1 U-shaped in plan, in turn, is shown in FIG. 18. In this case, the depth of the inclined tunnel 3 decreases in the direction from the aft end 4 located in the aft of the boat to its bow 11. Such a decrease in the depth of the inclined tunnel 3 is illustrated by cross sections along lines H - H and I - I shown in FIG. 15 and FIG. 16, respectively. The section along the line I - I (Fig. 16) is located farther from the aft end 4 towards the bow of the boat 11 than the section along the line H - H (Fig. 15), and, naturally, the depth of the inclined tunnel 3 in Fig. 16 is less than the depth of the inclined tunnel 3 in FIG. 15.

Reducing the depth of the inclined tunnel 3 in the direction from the aft end 4 to the bow 11 of the inflatable motor boat and the execution of the inclined tunnel 3 longitudinally ensures a smooth direction of water movement at an upward angle and its supply in the required quantity to the outboard propeller (not shown in the drawing) without the formation at the location of the screw (not shown in the drawing) the phenomenon of turbulence. This is achieved by filling the free volume of the tunnel 3 with water during the movement of the inflatable motor boat with minimal resistance from the water side, due to the fact that the vertical plane of symmetry of the tunnel 3 coincides with the vertical plane of symmetry of the hull 1, which, in turn, coincides with the velocity vector inflatable boat during its movement. Accordingly, the water flow at the exit from the tunnel 3 has a direction at an angle upward and enters the outboard propeller (not shown in the drawing) located so that the motion vector of the water flow at the exit of the inclined tunnel 3 passes through the axis of rotation of the propeller (not shown in the drawing).

As shown in FIG. 15, the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the surface of the water can be no more than 45 ° from the vertical. This allows you to make the side walls 13 so that the width of the tunnel 3 in cross section decreases in the direction from the bottom surface 15 of the inflatable bottom 2 to the upper inclined surface of the tunnel 3, conjugated with its side walls 13. This configuration allows you to raise the flow of water inside the tunnel 3 in the course of movement of the inventive inflatable boat and to provide the necessary density of water flow for trouble-free operation of the outboard engine (not shown in the drawing).

Due to the fact that the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the water surface can be no more than 45 ° from the vertical, the inner surface of the tunnel 3 has a substantially arcuate shape, since in the inflated state the shape of the side walls 13 and the upper inclined the surface of the tunnel 3 becomes rounded. Accordingly, the cross-sectional shape of the inner surface of the tunnel 3 is arched, as shown in FIG. 15. Nevertheless, in view of the structural features of the boat, namely the fact that the elements of the bottom 2 are interconnected by means of seams 18, the junction of the side walls 13 and the upper inclined surface of the tunnel 3 are small natural recesses. This feature is manifested throughout the longitudinal tunnel 3, including on the interface line 14 of the aft end 4 and the longitudinal tunnel 3. The presence of seams 18 in the design of the claimed invention ensures reliable connection of the parts of the material from which the inflatable bottom 2 is made.

The shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 containing the wedge-shaped portion has a substantially arcuate shape, as shown in FIG. 15. However, in view of the above-described features of connecting the elements of the inflatable bottom 2 by means of seams 18, the shape of the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal or U-shaped, which is seen from the stern in FIG. 15. In this case, the interface line 14 of the aft end 4 and the longitudinal tunnel 3 can be made trapezoidal in the case when the angle of inclination of the tangent to the side wall 13 of the tunnel 3 with respect to the plane of the water surface is from 0 ° to 45 ° from the vertical. If the tangent to the side wall 13 of the tunnel 3 is perpendicular to the plane of the water surface, that is, the angle of inclination of the tangent is 0 ° from the vertical, the shape of the mating line 14 of the aft end 4 and the longitudinal tunnel 3 can be made U-shaped.

At the same time, the section of the interface line 14, adjacent to the inclined plane of the longitudinal tunnel 3, can be curved towards the plane of the water surface and the plane of the lower surface 15 of the inflatable bottom 2, respectively. This makes it possible to raise the water flow and provide the necessary water flow density for trouble-free operation of the outboard engine (not shown in the drawing), which ensures high efficiency of the use of an inflatable boat in shallow water.

The fact that the inner surface of the longitudinal tunnel 3 has a substantially arcuate shape ensures sticking of the water flow inside the tunnel when moving the boat, and therefore, the effective supply of water from the tunnel 3 to the outboard screw (not shown in the drawing).

In this case, the side walls 13 of the inclined tunnel 3 can be made convex in the direction of the free volume, as shown in FIG. 15. This makes it possible to additionally increase the flow of water inside the tunnel 3 and provide the necessary density of the flow of water for trouble-free operation of the outboard engine (not shown in the drawing).

In this embodiment, the implementation of the claimed invention, the aft end 4 of the inflatable bottom 2 can also be made inclined. In this case, the angle of inclination of the aft end 4 to the plane of the water surface and to the lower surface 15 of the inflatable bottom 2 is less than 90 °. In this case, the inclined aft end 4 is connected to the longitudinal inclined tunnel 3. In turn, the longitudinal inclined tunnel 3 is located in the middle segment 12 of the inflatable bottom 2 and connected to the water channels 6, as shown in FIG. 13.

In this embodiment of the claimed invention, a transom (not shown in the drawing) is mounted on the upper surface 16 of the inflatable bottom 2 above the aft end 4. In turn, an outboard with a propeller (not shown in the drawing) is mounted on the transom (not shown in the drawing). This design of the inflatable boat allows the use of outboard engines with a shorter "foot" (381 mm) and to position the propeller (not shown in the drawing) closer to the plane of the water surface, above the stern draft of the boat itself. At the same time, the overall depth of the ship's immersion in water is reduced, which makes it possible to operate it on the shallows, at low water, etc.

The possibility of using outboard engines with a shorter “foot” (381 mm) is provided by the design of an inflatable motor boat containing at least two water channels 6 connected to an inclined tunnel 3 coupled to an inclined aft end 4, which provides a gradual change the angle of inclination of the water flow relative to the plane of the water surface during the transition from the water channels 6 to the tunnel 3, and then, along the inclined stern end 4 during the movement of the inflatable motor boat. Initially, water enters the water channels 6, after which it continues to move inside a longitudinal inclined tunnel 3 containing a wedge-shaped section. Then the water flow changes the angle of inclination on the interface line 14 of the tunnel 3 with the aft end 4 of the inflatable bottom 2. Thus, the possibility of disruption of the water flow at the inflection points is eliminated.

This movement of the water flow inside the water channels 6 and the longitudinal inclined tunnel 3 containing the wedge-shaped section, and then along the inclined aft end 4 ensures a smooth direction of the water movement at an upward angle and its supply to the outboard propeller (not shown in the drawing) without the formation of a turbulence phenomenon at the location of the screw (not shown in the drawing). Also, such a movement of the water flow inside the water channels 6 and the longitudinal inclined tunnel 3 containing the wedge-shaped section, and then along the inclined aft end 4 ensures smooth movement of the boat at the time of going on planing, which ensures high efficiency of operation of the boat, including in shallow water.

This configuration allows you to position the outboard propeller (not shown in the drawing) so that the speed vector of the inflatable motor boat coincides with the outboard motor driving vector (not shown in the drawing), and the axis of rotation of the propeller (not shown in the drawing), respectively , and was directed to the center of mass of the inflatable motor boat. This leads to a smooth movement of the inflatable motor boat and eliminates the effect of the boat oscillating in a vertical plane during movement, for example, at the time of going on planing. It follows that this configuration is optimal for the location of the outboard propeller (not shown in the drawing), which eliminates the risk of damage to the propeller (not shown in the drawing) and improves the efficiency of use of the boat in shallow water.

Within one possible embodiment of the claimed invention, the inflatable bottom 2 may be further provided with at least one transom plate 8, as shown in FIG. 12 - FIG. 14. By way of example, the transom plate 8 may be in the shape of a triangle, as shown in FIG. 18.

As an example, the inflatable bottom 2 may be further provided with three transom plates 8, as shown in FIG. 18, and the ribs of the transom plates 8 are located within the outer contour of the aft end 4 and the inflatable sides 10 of the housing 1.

Supplying the inflatable bottom 2 with at least one transom plate 8, as shown in FIG. 17, avoids subsidence of the stern of the inflatable boat when the boat enters gliding, and ensures stable movement of the inflatable motor boat. This aspect is important in the case of using the inventive inflatable motor boat in shallow water, as it helps to prevent damage to the outboard propeller (not shown in the drawing).

The inflatable bottom 2 can be made of any known design. As an example, the inflatable bottom 2 may be flat, or may be provided with a keel 17. An embodiment of an inflatable boat equipped with a keel 17 is shown in FIG. 3, which shows a side view of an inflatable boat.

The experiments conducted by the applicants showed that the most uniform movement of water is in cases where the angle of inclination of the tunnel 3 to the water surface is not more than 20 °.

As an example of a possible implementation of the invention, the angle of inclination of the aft end 4 to the plane of the water surface and to the lower surface 15 of the bottom 2, respectively, can be from 50 ° to 70 °.

It should be borne in mind that increasing the length of the longitudinal tunnel 3 leads to a decrease in the directional stability of the boat. In general, it is not recommended to make the length of tunnel 3 more than 50% of the total length of the boat.

The uniformity of the movement of water inside the tunnel 3 also depends on its width, a large width provides greater uniformity of movement. However, it must be borne in mind that the construction of tunnel 3 with a width exceeding 40% of the total width of the boat leads to a decrease in its lateral stability, therefore, in the manufacture of boats up to 6 m in length, it is desirable that the width of tunnel 3 does not exceed 60 cm.

As shown by comparative tests when operating in the same conditions, boats with the stated geometric dimensions of the tunnel 3, fuel economy can be up to 3% relative to boats in which the geometric dimensions of the tunnel 3 are made outside the claimed ranges.

In the case of supplying the inflatable bottom 2 of the inventive inflatable motor boat with water channels 6 connected to the tunnel 3, the uniformity of water movement is additionally ensured by the presence of water channels 6, which supply water to the tunnel 3, due to the direction of the water flow inside the inclined tunnel 3. This including ensures uniform movement of water inside the tunnel 3 in the future.

The most efficient water supply to the tunnel 3 in the case of supplying the inflatable bottom 2 with water channels 6 connected to the tunnel 3 is carried out when the depth of the water channels 6 is from 5 to 26 cm, the width is from 3 to 20 cm , and the total length of the tunnel 3 and water channels 6 is from 20 to 380 cm. These dimensions are due to a number of practical experiments in real conditions.

The inventive design of the inflatable boat in any possible version of its implementation allows the use of outboard engines with a short "foot" (381 mm) and position the propeller (not shown in the drawing) as close as possible to the aft end 4 and to the plane of the water surface, significantly higher than the aft draft itself boats. At the same time, the total depth of the ship’s immersion in water is reduced, which makes it possible to operate it on shallows, at low water, etc. In addition, the hull 1 and the bottom 2 of the inflatable boat are a kind of protection for the propeller located slightly above the bottom 2 (in the case of a jet engine - its water intake) (not shown in the drawing) from possible mechanical damage caused by stones, logs and other “debris” located in the water.

In addition, the location of the propeller (not shown in the drawing) as close to the stern end 4 reduces the likelihood of water splashes from the stern when the inflatable motor boat is moving, and also shifts the center of gravity closer to the center of the boat, improving its stability.

The use of the claimed technical solution allows to expand the operational characteristics of inflatable motor boats and provides additional protection for outboards installed on them from possible mechanical damage.

In the present application materials, the preferred disclosure was presented the implementation of the claimed technical solution, which should not be used as limiting other, private embodiments of its implementation, which do not go beyond the requested scope of legal protection and are obvious to specialists in the relevant field of technology.

Claims (31)

1. An inflatable motor boat containing: U-shaped body in plan, formed by an open loop of inflatable sides and bow, an inflatable bottom attached to the body, divided into at least three longitudinal segments, in this case, a longitudinal tunnel is made in the middle segment of the bottom, the inner surface of which has a substantially arcuate shape, however, the tunnel includes a section in a vertical section of a wedge-shaped shape with an angle of inclination to the plane of the water surface from 5 ° to 45 °. 2. The inflatable motor boat according to claim 1, characterized in that the tunnel includes an additional section with an angle of inclination from 0 ° to 20 °, the length of the additional section being less than the length of the section of a wedge-shaped shape. 3. The inflatable motor boat according to claim 1, characterized in that the width of the tunnel along the interface line with the aft end of the inflatable bottom is from 20 to 60 cm 4. An inflatable motor boat according to claim 1, characterized in that the tunnel length is from 5 to 50% of the entire length of the boat. 5. The inflatable motor boat according to claim 1, characterized in that the angle of inclination of the tangent to the side wall of the tunnel is not more than 45 ° from the vertical. 6. An inflatable motor boat containing: U-shaped body in plan, formed by an open loop of inflatable sides and bow, an inflatable bottom attached to the body, divided into at least three longitudinal segments, while in the middle segment of the bottom a longitudinal tunnel is made, which includes a section in a vertical section of a wedge-shaped shape, while the aft end face of the bottom, coupled with the tunnel, is made inclined and forms an angle of less than 90 ° to the plane of the water surface. 7. An inflatable motor boat according to claim 6, characterized in that the lower corners of the aft end are rounded. 8. The inflatable motor boat according to claim 6, characterized in that the depth of the tunnel on the interface line with the aft end of the inflatable bottom is from 2 to 25 cm. 9. The inflatable motor boat according to claim 6, characterized in that the width of the tunnel along the interface line with the aft end of the inflatable bottom is from 20 to 60 cm. 10. An inflatable motor boat according to claim 6, characterized in that the angle of inclination of the wedge-shaped section of the tunnel to the plane of the water surface is from 5 ° to 45 °. 11. An inflatable motor boat containing: U-shaped body in plan, formed by an open loop of inflatable sides and bow, an inflatable bottom attached to the body, divided into at least three longitudinal segments, while in the middle segment of the bottom a longitudinal tunnel is made, at the same time, at least two water channels of variable depth are made in the inflatable bottom during the longitudinal tunnel. 12. The inflatable motor boat according to claim 11, characterized in that the water channels are made by the continuation of the articulation lines of adjacent segments of the inflatable bottom. 13. The inflatable motor boat according to claim 11, characterized in that the water channel in the longitudinal section has a sinusoidal shape. 14. The inflatable motor boat according to claim 11, characterized in that the total length of the tunnel and the water channel connected to it is from 20 to 380 cm. 15. The inflatable motor boat according to claim 11, characterized in that the aft end face of the bottom, conjugated with a longitudinal tunnel, is inclined, with an angle of less than 90 ° with the plane of the water surface. 16. The inflatable motor boat according to claim 11, characterized in that the longitudinal tunnel includes a wedge-shaped section in a vertical section. 17. The inflatable motor boat according to clause 16, wherein the angle of inclination of the tunnel to the plane of the water surface is from 5 ° up to 45 °. 18. The inflatable motor boat according to claim 11, characterized in that the depth of the tunnel on the interface line with the aft end of the inflatable bottom is from 2 to 25 cm 19. The inflatable motor boat according to claim 11, characterized in that the width of the tunnel along the interface line with the aft end of the inflatable bottom is from 20 to 60 cm.

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