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NL2021426B1 - A method of providing a watercraft with a thruster; a thruster unit, and a watercraft. - Google Patents

A method of providing a watercraft with a thruster; a thruster unit, and a watercraft. Download PDF

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Publication number
NL2021426B1
NL2021426B1 NL2021426A NL2021426A NL2021426B1 NL 2021426 B1 NL2021426 B1 NL 2021426B1 NL 2021426 A NL2021426 A NL 2021426A NL 2021426 A NL2021426 A NL 2021426A NL 2021426 B1 NL2021426 B1 NL 2021426B1
Authority
NL
Netherlands
Prior art keywords
rubber
section
flange
unit
propeller
Prior art date
Application number
NL2021426A
Other languages
Dutch (nl)
Inventor
Cornelis Van Pelt Geert
Alexander Veth Hendrik
Original Assignee
Veth Propulsion B V
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Veth Propulsion B V filed Critical Veth Propulsion B V
Priority to NL2021426A priority Critical patent/NL2021426B1/en
Application granted granted Critical
Publication of NL2021426B1 publication Critical patent/NL2021426B1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
    • B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
    • B63H11/101—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof having means for deflecting jet into a propulsive direction substantially parallel to the plane of the pump outlet opening
    • B63H11/102—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof having means for deflecting jet into a propulsive direction substantially parallel to the plane of the pump outlet opening the inlet opening and the outlet opening of the pump being substantially coplanar
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H11/00—Marine propulsion by water jets
    • B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
    • B63H11/10—Marine propulsion by water jets the propulsive medium being ambient water having means for deflecting jet or influencing cross-section thereof
    • B63H11/107—Direction control of propulsive fluid
    • B63H11/113—Pivoted outlet
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H25/00—Steering; Slowing-down otherwise than by use of propulsive elements; Dynamic anchoring, i.e. positioning vessels by means of main or auxiliary propulsive elements
    • B63H25/46—Steering or dynamic anchoring by jets or by rudders carrying jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/14—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in non-rotating ducts or rings, e.g. adjustable for steering purpose

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Prevention Of Electric Corrosion (AREA)

Abstract

A thruster unit for a watercraft, such as a bow thruster, comprises a s shell and a conduit containing a propeller. It has baffles which can 5 be rotated to direct the flow of water to steer the vessle. For a durable thruster unit, it is mounted using a circumferentially extending rim, sandwiching a shell flange between rubber elements having a rubber hardness of 40 to 80 Shore A, isolating the shell from the rim. The rim is fixed to the watercraft.A thruster unit for a watercraft, such as a bow thruster, comprising a shell and a conduit containing a propeller. It has baffles which can be 5 rotated to direct the flow or water to steer the schokle. For a durable thruster unit, it is mounted using a circumferentially extending rim, sandwiching a shell flange between rubber elements having a rubber hardness or 40 to 80 Shore A, isolating the shell from the rim. The rim is fixed to the watercraft.

Description

A method of providing a watercraft with a thruster, a thruster unit, and a watercraft
The present invention relates to a method of providing a watercraft with a thruster unit, said thruster unit comprising a thruster body, wherein said thruster body comprises
- a shell, said shell comprising an upright shell wall,
- a conduit comprising an inlet section and an outlet section,
- a propeller mounted inside the conduit for propelling water from the inlet section to the outlet section, and
- a baffle rotatably mounted at the outlet section for diverting water from the inlet section sideways;
wherein the thruster unit is mounted to a fixture of the watercraft.
A watercraft - such as a boat, a ship or a submarine - is typically provided with one or more propellers to propel the watercraft to a desired location. For steering use may be made of a rudder (for relatively small watercraft) or in case of a watercraft with multiple propellers by operating them at different speeds and/or different rotational directions. For more precise manoeuvring it is known to use one or more thrusters units. A thruster is typically located at the bow of the watercraft but an additional thruster unit may be present at the stern or in the middle of the watercraft. A thruster comprises a conduit with an inlet section and an outlet section. A propeller is located inside the conduit for moving water from the inlet section to the outlet section. The propeller is driven by a first motor. The outlet section is provided with a baffle for deflecting water from the conduit sideways (along the hull of the watercraft). The baffle can be rotated along an upright axis by a second motor (baffle motor), and as a result the direction of the thrust from the thruster depends on the orientation of the baffle.
A watercraft comprises a hull with an opening for a thruster unit, and a fixture for the thruster unit. The thruster unit comprises a shell, the conduit, the propeller and the baffle. To mount the thruster unit, its shell is welded to the fixture.
A problem is that a thruster unit is fairly expensive, for which reason it should last a long time.
It is an object of the present invention to provide a watercraft with a thruster thus that is more durablv mounted.
To this end, a method according to the preamble is characterized in that
- the thruster unit further comprises a circumferentially extending rim, said rim comprising a rim body, and
- the shell comprises a circumferentially shell flange extending outwardly transverse to said upright wall of the shell;
wherein the shell flange is sandwiched between a first rubber element and a second rubber element, said rubber elements extending in said circumferential direction of the thruster body, wherein the rubber of the first rubber element and the rubber of the second rubber element are independently chosen from rubber having a rubber hardness of 40 to 80 Shore A, and wherein the sandwich of said rubber elements and the shell flange is sandwiched by said rim;
wherein mounting the thruster unit to the fixture of the watercraft comprises fixing the rim of the thruster unit to the fixture of the watercraft.
The use of the rubber elements achieve both a reduced risk in metal fatigue due to vibrations and contact corrosion as the shell is not in contact with the hull of the ship other than through the rubber elements which are electrically insulating. Contact corrosion reduces durability even when the thruster unit is not operating.
The thruster unit will typically comprise a motor or is provided with one after mounting the thruster unit.
The thickness of each of the rubber elements is typically between 20 and 40 mm (independently chosen). The width will typically between 40 and 80 mm.
According to a favourable embodiment, the rim body comprises an inner rim body section and an circumferentially extending outer rim flange, wherein the rim further comprises a ring having an inner ring section and an outer ring section, wherein to sandwich the rubber elements and the shell flange, the outer ring section is connected to the outer rim flange .
Typically the outer ring section will be connected to the outer rim flangein a reversible manner, conveniently bolted.
According to a favourable embodiment, the rubber of the first rubber element and the rubber of the second rubber element are independently chosen from rubber having a rubber hardness of 47 to 75 Shore A.
This is a preferred range for the rubber hardness for an even better reduction of metal fatigue once the thruster unit is operated.
According to a favourable embodiment, the rim body is fixed to the fixture of the watercraft by welding.
Thus the thruster unit is mounted securely to the hull of the watercraft.
The present invention also relates to a thruster unit comprising a thruster body, wherein said thruster body comprises
- a shell, said shell comprising an upright shell wall,
- a conduit comprising an inlet section and an outlet section, ~ a propeller mounted inside the conduit for propelling water from the inlet section to the outlet section, and
- a baffle rotatably mounted at the outlet section for diverting water from the inlet section sideways;
wherein
- the thruster unit further comprises a circumferentially extending rim, said rim comprising a rim body, and
- the shell comprises a circumferentially shell flange extending outwardly transverse to said upright wall of the shell;
wherein the shell flange is sandwiched between a first rubber element and a second rubber element, said rubber elements extending in said circumferential direction of the thruster body, wherein the rubber of the first rubber element and the rubber of the second rubber element are independently chosen from rubber having a rubber hardness of 40 t 80 Shore A, and wherein the sandwich of said rubber elements and the shell flange is sandwiched by said rim.
Such a thruster unit can be used in the method according to the invention .
The thruster unit can act as a bow or a stern thruster depending on where it will mounted to the watercraft.
According to a favourable embodiment, the rim body comprises an inner rim body section and an circumferentially extending outer rim flange;
wherein the rim further comprises a ring having an inner ring section and an outer ring section;
the outer ring section being connected to the outer rim flange, sandwiching the rubber elements and the shell flange.
Typically the outer ring section is connected to the outer rim flange in a reversible manner, conveniently bolted.
According to a favourable embodiment, the rubber of the first rubber element and the rubber of the second rubber element are independently chosen from rubber having a rubber hardness of 47 to 75 Shore A.
This is a preferred range for the rubber hardness for an even better reduction of metal fatigue once the thruster unit is operated.
Finally, the present invention relates to a watercraft comprising a hull with a fixture, wherein said fixture is provided with a thruster unit, wherein the thruster unit is a thruster unit according to claim 5 to 7.
Such a watercraft allows for reliable thruster unit.
The thruster unit can act as a bow or a stern thruster depending on where it is mounted to the watercraft.
According to a favourable embodiment, wherein the rim body is welded to the fixture of the hull.
Thus the thruster unit is mounted securely to the hull of the watercraft.
The present invention will now be illustrated with reference to the drawing where
Fig. 1A shows a cross-sectional view through a thruster unit mounted to the hull of a watercraft;
Fig. IB shows a bottom view of the thruster unit of Fig. 1A;
Fig. 2 shows a perspective view on the thruster unit of Fig. 1A; and
Fig. 3 shows a detail of the thruster unit of Fig. 1A.
Fig. 1A shows a cross-sectional view through a thruster unit 100 mounted to the hull 190 (only partially shown) of a watercraft and Fig. IB shows a bottom view of the thruster unit 100 of Fig. 1A.
The thruster unit 100 comprises a thruster body 110 provided with a motor 120.
The thruster body 110 comprises
- a shell 130, said shell 130 comprising an upright shell wall 131, a conduit 140 comprising an inlet section 141 and an outlet section 142, and ~ a propeller 132 mounted inside the conduit 140 and driven by the motor 120 via axle 121 for propelling water from the inlet section 141 to the outlet section 142.
At the outlet section 142 the conduit 140 is provided with rotatably mounted baffles 152 for diverting water from the inlet section sideways, i.e. parallel to the hull 190 of the watercraft.
To reduce the risk of the propeller 132 or baffles from getting clogged or damaged by debris in water such as wood or weed, conduit 140 is provided at the inlet section 141 with a grate 151. To reduce turbulence, the conduit 140 will be provided with one or more vanes 153.
The thruster unit 100 as described above is known in the art. It is for example used as a bow thruster, facilitating manoeuvring of the watercraft.
The hull 190 is provided with a foundation 191 (fixture), which is basically an upright wall enclosing an opening in the hull 190.
Fig. 2 shows a perspective view on the thruster unit 100 according to the invention as depicted in Fig. 1A.
The thruster unit 100 comprises a baffle motor 220 for rotating the baffles 152 about a vertical axis.
The conduit 140 is connected to the shell wall 131 with reinforcement ribs 231 to make the thruster body 110 rigid.
The thruster body 110 is provided along its circumerferential edge with a rim 260, which is discussed in more detail below.
Fig. 3 shows a detail of Fig. 1A, and more specifically shows the shell wall 131 which is provided with a shell flange 260 circumferentially extending outwardly transverse to said upright wall 131.
The circumferentially extending rim 260 of the thruster unit 100 comprises a rim body 360 which will be welded to the foundation 191.
The shell flange 260 is sandwiched between a first rubber element 361 and a second rubber element 362, said rubber elements extending in said circumferential direction of the thruster body 110, wherein the rubber of the first rubber element 361 and the rubber of the second rubber element 362 both have a rubber hardness of 65 Shore A, a width of 60 mm and a thickness of 33 mm.
The sandwich of the rubber elements and the shell flange 260 is sandwiched between the rim body 360 and a closing ring 370 which is bolted at an outer ring section 373 thereof to an outer rim flange 363 extending from the rim body 360 with a bolt 371 and a nut 372. Thus the shell 130 is not in direct contact with the hull 190 but electrically insulated by the rubber elements.

Claims (9)

ConclusiesConclusions 1. Werkwijze voor het verschaffen van een vaartuig met een schroefeenheid (100), waarbij de schroefeenheid (100) een schroeflichaam (110) omvat, waarbij het schroeflichaam (110) het volgende omvat:A method for providing a vessel with a propeller unit (100), wherein the propeller unit (100) comprises a propeller body (110), the propeller body (110) comprising: - een omhulsel (130), waarbij het omhulsel (130) een rechtopstaande omhulsel wand (131) omvat,- an envelope (130), wherein the envelope (130) comprises an upright envelope wall (131), - een leiding (140) die een inlaatsectie (141) en een uitlaatsectie (142) omvat,- a conduit (140) comprising an inlet section (141) and an outlet section (142), - een propeller (132) die binnen de leiding (140) gemonteerd is voor het voortstuwen van water uit de inlaatsectie (141) naar de uitlaatsectie (142), en- a propeller (132) mounted within the conduit (140) for propelling water from the inlet section (141) to the outlet section (142), and - een schot dat roteerbaar gemonteerd is op de uitlaatsectie (142) voor het zijwaarts uit de inlaatsectie (141) divergeren van water;- a baffle rotatably mounted on the outlet section (142) for diverging water sideways from the inlet section (141); waarbij de schroefeenheid (100) gemonteerd is op een bevestiging (191) van het vaartuig;wherein the propeller unit (100) is mounted on a mounting (191) of the vessel; met het kenmerk datcharacterized in that - de schroefeenheid (100) verder een zich rondgaand uitstrekkende rand (260) omvat, waarbij de rand (260) een randlichaam (360) omvat, en- the screw unit (100) further comprises a circumferentially extending edge (260), the edge (260) comprising an edge body (360), and - het omhulsel (130) een rondgaande omhulselflens (260) omvat die zich naar buiten toe uitstrekt dwars op de rechtopstaande wand (131) van het omhulsel (130);- the casing (130) comprises a circumferential casing flange (260) which extends outwardly transversely of the upright wall (131) of the casing (130); waarbij de omhulselflens (260) ingeklemd is tussen een eerste rubberelement (361) en een tweede rubberelement (362), waarbij de rubberelementen zich in rondomgaande richting van het schroeflichaam (110) uitstrekken, waarbij het rubber van het eerste rubberelement (361) en het rubber van het tweede rubberelement (362) onafhankelijk gekozen zijn uit rubber met een rubberhardheid van 40 tot 80 Shore A, en waarbij de inklemming van de rubberelementen en de omhulselflens (260) ingeklemd is door de rand (260);the casing flange (260) being sandwiched between a first rubber element (361) and a second rubber element (362), the rubber elements extending in the circumferential direction of the screw body (110), the rubber of the first rubber element (361) and the rubber of the second rubber element (362) are independently selected from rubber with a rubber hardness of 40 to 80 Shore A, and wherein the clamping of the rubber elements and the envelope flange (260) is clamped by the edge (260); waarbij het monteren van de schroefeenheid (100) aan de bevestiging (191) van het vaartuig het bevestigen van de rand (260) van de schroefeenheid (100) aan de bevestiging (191) van het vaartuig omvat.wherein mounting the propeller unit (100) to the vessel's mounting (191) includes attaching the rim (260) of the propeller unit (100) to the vessel's mounting (191). 2. Werkwijze volgens conclusie 1, waarbij het randlichaam (360) een inwendige randlichaam- (360) sectie en een zich rondgaand uitstrekkende buitenrandflens (363) omvat,The method of claim 1, wherein the peripheral body (360) comprises an internal peripheral body (360) section and a circumferentially extending outer peripheral flange (363), - 8 waarbij de rand (260) verder een ring (370) omvat met een inwendige ringsectie en een uitwendige ringsectie (373), waarbij om de rubberelementen en de omhulselflens (260) in te klemmen, de buitenringsectie (373) verbonden wordt met de buitenrandflens (363).- 8 wherein the rim (260) further comprises a ring (370) having an inner ring section and an outer ring section (373), wherein to clamp the rubber elements and the casing flange (260), the outer ring section (373) is connected to the outer edge flange (363). 3. Werkwijze volgens conclusie 1 of 2, waarbij het rubber van het eerste rubberelement (361) en het rubber van het tweede rubberelement (362) onafhankelijk gekozen worden uit rubber met een rubberhardheid van 47 tot 75 Shore A.The method of claim 1 or 2, wherein the rubber of the first rubber element (361) and the rubber of the second rubber element (362) are independently selected from rubber with a rubber hardness of 47 to 75 Shore A. 4. Werkwijze volgens één van de voorgaande conclusies, waarbij het randlichaam (360) middels het lassen bevestigd wordt aan de bevestiging (191) van het vaartuig.A method according to any one of the preceding claims, wherein the peripheral body (360) is secured by welding to the attachment (191) of the vessel. 5. Schroefeenheid (100) die een schroeflichaam (110) omvat, waarbij het schroeflichaam (110) het volgende omvat:A screw unit (100) comprising a screw body (110), the screw body (110) comprising: - een omhulsel (130), waarbij het omhulsel (130) een rechtopstaande omhulsel wand (131) omvat,- an envelope (130), wherein the envelope (130) comprises an upright envelope wall (131), - een leiding (140) die een inlaatsectie (141) en een uitlaatsectie (142) omvat,- a conduit (140) comprising an inlet section (141) and an outlet section (142), - een propeller (132) die binnen de leiding (140) gemonteerd is voor het voortstuwen van water uit de inlaatsectie (141) naar de uitlaatsectie (142), en- a propeller (132) mounted within the conduit (140) for propelling water from the inlet section (141) to the outlet section (142), and - een schot dat roteerbaar bij de uitlaatsectie (142) gemonteerd is voor het zijwaarts uit de inlaatsectie (141) divergeren van water;- a baffle rotatably mounted at the outlet section (142) for diverting water sideways from the inlet section (141); met het kenmerk datcharacterized in that - de schroefeenheid (100) verder een zich rondom uitstrekkende rand (260) omvat, waarbij de rand (260) een randlichaam (360) omvat, en- the screw unit (100) further comprises an all-round edge (260), the edge (260) comprising an edge body (360), and - het omhulsel (130) een rondgaande omhulselflens (260) omvat die zich naar buiten toe uitstrekt dwars op de rechtopstaande wand (131) van het omhulsel (130);- the casing (130) comprises a circumferential casing flange (260) which extends outwardly transversely of the upright wall (131) of the casing (130); waarbij de omhulselflens (260) tussen een eerste rubberelement (361) en een tweede rubberelement (362) ingeklemd is, waarbij de rubberelementen zich in de rondgaande richting van het schroeflichaam (110) uitstrekken, waarbij het rubber van het eerste rubberelement (361) en het rubber van het tweede rubberelement (362) onafhankelijk gekozen zijn uit rubber met een rubberhardheid van 40 tot 80 Shore A, en waarbij de inklemming van rubberelementen en de omhulselflens (260) door de rand (260) ingeklemd is.the casing flange (260) being sandwiched between a first rubber element (361) and a second rubber element (362), the rubber elements extending in the circumferential direction of the screw body (110), the rubber of the first rubber element (361) and the rubber of the second rubber element (362) are independently selected from rubber with a rubber hardness of 40 to 80 Shore A, and wherein the clamping of rubber elements and the envelope flange (260) is clamped by the edge (260). -92021426-92021426 6. Schroefeenheid (100) volgens conclusie 5, waarbij het randlichaam (360) een binnenrandlichaam- (360) sectie en een zich rondgaande uitstrekkende buitenrandflens (363) omvat;The screw unit (100) of claim 5, wherein the peripheral body (360) comprises an inner peripheral body (360) section and a circumferentially extending outer peripheral flange (363); waarbij de rand (260) verder een ring (370) omvat met een binnenringsectie en een buitenringsectie (373);wherein the rim (260) further comprises a ring (370) with an inner ring section and an outer ring section (373); waarbij de buitenringsectie (373) verbonden is met de buitenrandflens (363), die de rubberelementen (361, 362) en de omhulselflens (260) inklemt.wherein the outer ring section (373) is connected to the outer edge flange (363), which clamps the rubber elements (361, 362) and the envelope flange (260). 7. Schroefeenheid (100) volgens één van de conclusies 5 of 6, waarbij het rubber van het eerste rubberelement (361) en het rubber van het tweede rubberelement (362) onafhankelijk gekozen zijn uit rubber met een rubberhardheid van 47 tot 75 Shore A.The screw unit (100) of any one of claims 5 or 6, wherein the rubber of the first rubber element (361) and the rubber of the second rubber element (362) are independently selected from rubber with a rubber hardness of 47 to 75 Shore A. 8. Vaartuig dat een scheepsromp (190) met een bevestiging (191) omvat, waarbij de bevestiging (191) voorzien is van een schroefeenheid (100), met het kenmerk dat de schroefeenheid (100) een schroefeenheid (100) is volgens conclusie 5-7.Vessel comprising a ship's hull (190) with a mounting (191), the mounting (191) comprising a propeller unit (100), characterized in that the propeller unit (100) is a propeller unit (100) according to claim 5 -7. 9. Vaartuig volgens conclusie 8, waarbij het randlichaam (360) gelast is aan de bevestiging (191) van de scheepsromp (190).The vessel of claim 8, wherein the peripheral body (360) is welded to the attachment (191) of the ship's hull (190).
NL2021426A 2018-08-03 2018-08-03 A method of providing a watercraft with a thruster; a thruster unit, and a watercraft. NL2021426B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
NL2021426A NL2021426B1 (en) 2018-08-03 2018-08-03 A method of providing a watercraft with a thruster; a thruster unit, and a watercraft.

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Application Number Priority Date Filing Date Title
NL2021426A NL2021426B1 (en) 2018-08-03 2018-08-03 A method of providing a watercraft with a thruster; a thruster unit, and a watercraft.

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NL2021426B1 true NL2021426B1 (en) 2020-02-12

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL16979C (en) *
US3835805A (en) * 1972-06-05 1974-09-17 Samuel J White & Co Ltd Thruster unit
US20040185724A1 (en) * 2003-02-07 2004-09-23 Norbert Korenjak Integrated engine-jet pump drive unit for marine application
US20160121987A1 (en) * 2013-08-15 2016-05-05 Blue Sky Marine, LLC Hull mounted, steerable marine drive with trim actuation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL16979C (en) *
US3835805A (en) * 1972-06-05 1974-09-17 Samuel J White & Co Ltd Thruster unit
US20040185724A1 (en) * 2003-02-07 2004-09-23 Norbert Korenjak Integrated engine-jet pump drive unit for marine application
US20160121987A1 (en) * 2013-08-15 2016-05-05 Blue Sky Marine, LLC Hull mounted, steerable marine drive with trim actuation

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Effective date: 20220901