JPS582474A - Automatically adjusting sail wing - Google Patents

Abstract

PURPOSE:To provide the sufficient strength and the rigidity and to improve the hydrodynamic performance by employing the automatically adjustable sail wing. CONSTITUTION:Upon the application of the hydrodynamic force the wing board at the front edge section will rotate around the wing beam shaft 2 thus to change the direction automatically in accordance to the change of the speed or the direction of the flow. In other word when the angle of attack of the flow against the sail wing will vary by same degree in + or - direction the shape of the wing board 3 is made symmetrical up and down, while when the flow is in one direction and only the angle of attack will vary the wing board is made asymmetrical up and down. Consequently in any case the excellent hydrodynamic performance can be exhibited in the full range in accordance to the varying range of the angle of attack.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sail wing that can be used for sailing ships, windmills, and the like.

There are various types of sail wings that can be used for sailboats and windmills, but this type of wing has a weight of 411 tons, has sufficient strength and rigidity, has excellent hydrodynamic performance, and is also capable of controlling wind direction and speed. It is desirable to be able to respond efficiently to changes.

The present invention was made to satisfy these demands, and by making the sail wing into a self-adjusting type, it is lightweight yet has sufficient IiI degree and rigidity, and can efficiently respond to changes in wind direction and speed. The purpose of this project is to provide a sail wing with excellent hydrodynamic performance that can respond to these demands.

The present invention will be described in detail below with reference to the drawings.

In this example, the first r! ! As shown in JK, two wing tip lips made of plate-shaped bodies with a length equal to the chord length are placed on both sides of the wing, and the leading edge of each of these J[ll A wing spar axis λ is rotatably provided and is distributed at appropriate intervals on a plurality of (three in this embodiment) airfoil plates JttM blade spar axes formed of a flexible material such as rubber. The outer periphery of each of these airfoil plates J is covered with a flexible membrane such as cloth, film, or thin metal plate to form the leading edge of the wing.

In addition, a tension wire j such as a steel wire is stretched between the rear end portion /a of the wing tip lip l, and this tension wire! A self-shaping sail wing is constructed by extending the same flexible membrane between the front rut and the trailing edge ηa of the flexible membrane forming the front rut.

In addition, ≠b in Figures 1 to 1 is a tension wire! t is a reinforcing plate provided at the front of the airfoil plate J. be.

Also, the angle of attack α of the fluid flow relative to the sail wing is F
If the + (E) component changes to the same phase If in each of the − (negative) directions as shown in Figure 3 (a), the shape of the airfoil plate J should be vertically symmetrical as shown in Figure 3 (fa). , when the flow is only in one direction (for example, the direction) and only the magnitude of the attack angle α differs (see Figure 1 fbl), or even if the attack angle α changes to the direction, there is a difference in magnitude in each direction. If t
As shown in a-FIG. 1a), it is preferable for the airfoil J to be vertically asymmetric.

Next, the operation of the self-adjusting sail wing of the present invention constructed as described above will be explained.

In an unloaded state where no fluid force acts on this sail wing, it has the cross-sectional shape shown in Figure 2, but when fluid force acts on it, the airfoil plate 3 at the leading edge moves around the wing spar axis. Since it can rotate, it automatically changes its direction according to changes in the speed or direction of the flow, resulting in the shape shown in Figure 3 (Al or Dai-Hirozu et al.), which is excellent in hydrodynamics in any case. It is designed to demonstrate its performance.

In other words, if the angle of attack α of the fluid flow relative to the sail wing changes to VCf to the same extent in ten directions or in one direction, it will become as shown in FIG. If only the angle of attack α differs; I
By changing the button as shown in the Xg diagram (at K), in any case, excellent hydrodynamic performance can be exhibited over the entire range according to the range in which the angle of attack α changes.

Furthermore, the portion of the leading edge connecting the dk 1ia to the flexible membrane forms a cup with a clear connection over the range where the angle of attack changes, thereby improving performance.

Since the present invention has the above-mentioned structural pressure on the sail wing, the sail wing of the present invention is lightweight, has sufficient strength and rigidity, and also automatically adjusts to an appropriate cross-section according to changes in flow speed or direction. It has the excellent effect of being able to exhibit excellent hydrodynamic performance.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a sail wing according to the present invention, Fig. 2 is a longitudinal cross-sectional side view of the wing in the direction of flow, Mj Fig. 1a) is a diagram of a change in airfoil shape of a sail wing with a symmetrical leading edge, Fig. 1b
1 is a diagram of the change in the angle of attack, Figure 1 ml is a diagram of the shape of the sail wing with an asymmetric leading edge, and Tbl is the diagram of the shape of the sail wing with an asymmetric leading edge.
is a diagram of changes in the angle of attack. l... Wing tip rib, -... Wing spar axis, 3... Airfoil plate,
Hiro...flexible membrane! ...Tension wire, 6...Reinforcement plate.

Claims (1)

[Claims] 1 A wing tip lip is provided at each end of the wing, a wing spar shaft is rotatably provided that passes through the leading edge of each of these wing tip lips, and a plurality of airfoil plates formed of flexible material are attached to the wing spar. These airfoil plates are attached distributed on the shaft and covered with a flexible membrane on the outer periphery of each airfoil plate to form the leading edge of the wing. A self-adjusting sail wing with a flexible membrane stretched between the edge and the trailing edge of the flexible membrane.