WO2009070852A1 - A watercraft stability control device - Google Patents

A watercraft stability control device Download PDF

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Publication number
WO2009070852A1
WO2009070852A1 PCT/AU2008/001817 AU2008001817W WO2009070852A1 WO 2009070852 A1 WO2009070852 A1 WO 2009070852A1 AU 2008001817 W AU2008001817 W AU 2008001817W WO 2009070852 A1 WO2009070852 A1 WO 2009070852A1
Authority
WO
WIPO (PCT)
Prior art keywords
dimples
stability device
watercraft
fin
fins
Prior art date
Application number
PCT/AU2008/001817
Other languages
French (fr)
Inventor
John Gene Foster
Original Assignee
John Gene Foster
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
Priority claimed from AU2007906666A external-priority patent/AU2007906666A0/en
Application filed by John Gene Foster filed Critical John Gene Foster
Publication of WO2009070852A1 publication Critical patent/WO2009070852A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B32/00—Water sports boards; Accessories therefor
    • B63B32/60—Board appendages, e.g. fins, hydrofoils or centre boards
    • B63B32/62—Board appendages, e.g. fins, hydrofoils or centre boards characterised by the material, e.g. laminated materials; characterised by their manufacturing process

Definitions

  • the present invention relates to hydrodynamics and the design of watercraft stability control devices.
  • the invention relates to fins for surfboards and will therefore be described in this context.
  • the stability control device may be used in other applications such as centreboards, daggerboards, rudders and keels.
  • Watercraft generally have a stability control device which extends vertically into the water from the hull of the vessel. These devices assist in the stability and aid steering of the watercraft. They are particularly common on surfboards, windsurfers, yachts, catamarans and the like.
  • the stability control device is known as a fin.
  • the fin is fitted to the bottom of the surfboard in a multitude of designs. Commonly there is more than one fin fitted with the multi-fin Thruster design being the most commonly used.
  • the Thruster design has three fins, with two fins placed next to the edges of the surfboard and one fin placed in the centre of the surfboard. The centre fin is placed closest to a trailing end of the surfboard and the side fins and are placed further towards a leading end of the surfboard or nose.
  • This fin allows the fin to rotate around a vertical axis of the fin.
  • the degree of rotation of the fin is independent to the amount of the hydrodynamic force on the fin. This has the advantage, according to the author, that the fin provides a substantially increased effectivity which commences at low speeds.
  • This fin design is complex with moving parts which are more difficult to manufacture and may be prone to malfunction.
  • US Patent US6106346 discloses an upper vertical stabilizer element, a hollow tubular element, and a lower vertical stabilizer element between the upper and lower stabilizer elements.
  • the lower vertical stabilizer elements provide lateral stability and the hollow tubular element provides increased lateral stability and vertical stability for enhanced control by a user. This is a specific fin design with complex shapes and cannot therefore be incorporated in other designs of fin.
  • Australian Patent Application AU2003204735 discloses a "flat foiled fin" with a series of four vents passing laterally through the fin. Each vent is elongated and aligned laterally to the baseline of the fin one on top of the other. The effect of the vents alters the hydrodynamics of the fin when turning by passing water through the vents and reducing resistance through the water. Holes in the vent will inevitably reduce the strength of the fin and may lead to a reduction in stability due to the lack of surface area.
  • the invention resides in a watercraft stability device comprising: a body for locating in water, the body having a plurality of hydrodynamic members.
  • the hydrodynamic members may be dimples.
  • the dimples are circular. However it should be appreciated that other shaped dimples may be constructed such as oval or hexagonal.
  • the dimples are between 5mm and 50mm in diameter. More preferably, the dimples are between 20mm and 30mm in diameter and ideally the dimples are substantially 25mm in diameter.
  • the depth of each dimple is between 1mm and 10 mm and preferably the depth of each dimple is between 2mm and 4mm.
  • hydrodynamic members are formed as part of the body.
  • the hydrodynamic members may be structured or randomly distributed.
  • the hydrodynamic members may be applied to one or more surfaces of the body.
  • the hydrodynamic members may be created within or on the body by etching, sculpting, casting or using any other process known in the art.
  • the body is injection moulded.
  • FIG 1 shows a complete surfboard with stability control devices attached
  • FIG 2 shows a close-up of a stability control device
  • FIG 3 is a section of the stability control device through several dimples
  • FIG 4 shows a further embodiment of the design using alternative hexagonally shaped dimples.
  • FIG 1 shows a perspective view of three stability control devices 200 installed on an inverted surfboard 100.
  • the stability control devices 200 are used to aid the stability of the surfboard allowing for extra speed, stability and maneuverability.
  • the stability control devices 200 in this embodiment are fins 200. It should be appreciated that the stability control devices 200 may be a centreboard or a rudder of a boat.
  • the surfboard 100 is readily known to a person skilled in the art as is its method of manufacture.
  • the surfboard 100 can be of any known shape as is known in the art.
  • the surfboard 100 may have a single fin 200 or a multiplicity of fins 200 and the fins 200 are attached close to a tail 110 of the surfboard 100.
  • fin placement include “the twin” (2 fins), “the thruster” (3 fins) and “the quad” (4 fins).
  • FIG 1 shows a typical design utilising "the thruster” placement.
  • the three fins 200 are placed towards the tail 110 of the surfboard 100.
  • a centre fin 200A is placed in the centre of the surfboard 100.
  • Two further fins 200B and 200C are placed on either side of the surfboard 100 but nearer a nose 120 of the surfboard 100 than the centre fin 200A.
  • FIG 2 shows a side view of the centre fin 200A.
  • the fins 200 are made out of fibre-glass, however it should be appreciated that a person skilled in the art would recognise other suitable materials such as plastic, epoxy, carbonate, timber, aluminum, polystyrene and polyester.
  • the fins 200 have a tip 210 and a base 220.
  • the tip 210 extends vertically downwards from the bottom 130 of the surfboard 100 into the water.
  • the base 220 is used to anchor the fins 200 to the surfboard 100.
  • the fins 200 are either permanently attached to the bottom 130 of the surfboard 100 by fibreglassing the fin 200 in position.
  • the fins 200 are attached to the surfboard 100 by using plugs which locate into an inversely identically shaped "fin box" on the surfboard 100 and a grub-screw to secure the fins 200 in place.
  • the fins 200 can be attached to the surfboard in any manner known in the art.
  • Each of the fins 200 has many hydrodynamic members in the form of circular dimples 230.
  • Each dimple 230 may be between 5mm and 50mm in diameter. More preferably each dimple 230 is between 20mm and 30mm in diameter and in one embodiment of the present invention the dimples 230 are 25mm in diameter. Furthermore, different diameter dimples 230 may be formed on the same fin 200.
  • the dimples 230 are on both sides of the centre fin 200A and on the outermost surfaces of the fins 200B and 200C positioned nearest to rails 140 of the surfboard 100. It should be appreciated that the dimples 230 may be placed anywhere on any surface of the fins 200 or part of any surface of the fins 200. The dimples 230 may be randomly placed on the fins 200 or in a predetermined manner or pattern. The dimples 230 can be ordered in such a way that each side of the dimple 230 touches the edge of an adjoining dimple 230 or is positioned such that the edges of the dimples 230 are spaced away from another dimple 230.
  • the dimples 230 could be an oval, a square, a hexagon or any other shape, size or depth. It should be appreciated that changes to the laminar flow of water around the fins 200 create different effects. In further embodiments of the present invention the dimples can be replaced by protruding shapes on the surface of the fins 200 or a combination of protruding shapes and dimples.
  • FIG 3 shows a cross section of the centre fin 200A dimples 230.
  • the circular dimples 230 are moulded into the centre fin 200A to a predetermined depth such that the strength is not compromised and no dimple extends through the fin 200.
  • the depth of each dimple 230 may be between 1mm and 10mm depending on the type of fin or application used.
  • FIG 4 shows a cross section of an outer most fin 200C using an alternative embodiment to the present invention.
  • This outer most fin 200C utilises hexagonally shaped dimples 240.
  • the hexagonally shaped dimples 240 penetrate the fins 200 to a pre-determined depth such that the strength is not compromised and no hexagonally shaped dimple 240 extends through to the other side of the fins 200.
  • the hexagonally shaped dimples 240 can be ordered in such a way that each side of the hexagonally shaped dimple 240 touches the edge of an adjoining hexagonally shaped dimple 240 or is positioned such that the edges of the hexagonally shaped dimples 240 are spaced away from the next hexagonally shaped dimple 240.
  • the hexagonally shaped dimples 240 may be arranged to repeat a different larger shape made up of many hexagonally shaped dimples 240.
  • the fins 200 are attached to the bottom 130 of the surfboard 100. Water passing over the fins 200 changes the laminar flow over the dimples 230. It is envisaged that the dimples 230 in the fins 200 cause a separation in the boundary layer of water passing over the dimples 230 reducing drag.
  • the surfer experiences greater stability, maneuverability and speed using a surfboard 100 fitted with fins 200 having dimples 230 over a surfboard fitted with fins 200 made without the dimples 230.

Abstract

The invention resides in a watercraft stability device comprising a body for locating in water, the body having a plurality of hydrodynamic members wherein the hydrodynamic members are dimples.

Description

TITLE A WATERCRAFT STABILITY CONTROL DEVICE
FIELD OF THE INVENTION
The present invention relates to hydrodynamics and the design of watercraft stability control devices. In particular the invention relates to fins for surfboards and will therefore be described in this context. However, it should be noted the stability control device may be used in other applications such as centreboards, daggerboards, rudders and keels.
BACKGROUND TO THE INVENTION Watercraft generally have a stability control device which extends vertically into the water from the hull of the vessel. These devices assist in the stability and aid steering of the watercraft. They are particularly common on surfboards, windsurfers, yachts, catamarans and the like. In surfboard design the stability control device is known as a fin. The fin is fitted to the bottom of the surfboard in a multitude of designs. Commonly there is more than one fin fitted with the multi-fin Thruster design being the most commonly used. The Thruster design has three fins, with two fins placed next to the edges of the surfboard and one fin placed in the centre of the surfboard. The centre fin is placed closest to a trailing end of the surfboard and the side fins and are placed further towards a leading end of the surfboard or nose.
The problem with adding more stability devices is that it increases the amount of drag encountered by the surfboard. Drag reduces the speed of the surfboard through the water.
Various designs have addressed drag and these are summarised below. World Patent No. WO2006009439 discloses a Hydrodynamic
Fin. The design of this fin allows the fin to rotate around a vertical axis of the fin. The degree of rotation of the fin is independent to the amount of the hydrodynamic force on the fin. This has the advantage, according to the author, that the fin provides a substantially increased effectivity which commences at low speeds. This fin design is complex with moving parts which are more difficult to manufacture and may be prone to malfunction.
US Patent US6106346 discloses an upper vertical stabilizer element, a hollow tubular element, and a lower vertical stabilizer element between the upper and lower stabilizer elements. The lower vertical stabilizer elements provide lateral stability and the hollow tubular element provides increased lateral stability and vertical stability for enhanced control by a user. This is a specific fin design with complex shapes and cannot therefore be incorporated in other designs of fin.
Australian Patent Application AU2003204735 discloses a "flat foiled fin" with a series of four vents passing laterally through the fin. Each vent is elongated and aligned laterally to the baseline of the fin one on top of the other. The effect of the vents alters the hydrodynamics of the fin when turning by passing water through the vents and reducing resistance through the water. Holes in the vent will inevitably reduce the strength of the fin and may lead to a reduction in stability due to the lack of surface area.
The designs described in the above patents or patent applications have the disadvantage of being unique inventions and cannot easily be applied to existing designs.
OBJECT OF THE INVENTION
It is an object to overcome and/or alleviate one or more of the above disadvantages or provide the consumer with a useful or commercial device.
SUMMARY OF THE INVENTION
In one form, although not necessarily the only or the broadest form, the invention resides in a watercraft stability device comprising: a body for locating in water, the body having a plurality of hydrodynamic members.
The hydrodynamic members may be dimples. Preferably the dimples are circular. However it should be appreciated that other shaped dimples may be constructed such as oval or hexagonal. Preferably the dimples are between 5mm and 50mm in diameter. More preferably, the dimples are between 20mm and 30mm in diameter and ideally the dimples are substantially 25mm in diameter. Suitably the depth of each dimple is between 1mm and 10 mm and preferably the depth of each dimple is between 2mm and 4mm.
Preferably the hydrodynamic members are formed as part of the body. The hydrodynamic members may be structured or randomly distributed.
The hydrodynamic members may be applied to one or more surfaces of the body.
The hydrodynamic members may be created within or on the body by etching, sculpting, casting or using any other process known in the art.
Preferably the body is injection moulded.
BRIEF DESCRIPTION OF THE DRAWINGS By way of example only, preferred embodiments of the invention will be described more fully hereinafter with reference to the accompanying drawings, wherein:
FIG 1 shows a complete surfboard with stability control devices attached;
FIG 2 shows a close-up of a stability control device; FIG 3 is a section of the stability control device through several dimples; and
FIG 4 shows a further embodiment of the design using alternative hexagonally shaped dimples.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
FIG 1 shows a perspective view of three stability control devices 200 installed on an inverted surfboard 100. The stability control devices 200 are used to aid the stability of the surfboard allowing for extra speed, stability and maneuverability. The stability control devices 200 in this embodiment are fins 200. It should be appreciated that the stability control devices 200 may be a centreboard or a rudder of a boat.
The surfboard 100 is readily known to a person skilled in the art as is its method of manufacture. The surfboard 100 can be of any known shape as is known in the art.
The surfboard 100 may have a single fin 200 or a multiplicity of fins 200 and the fins 200 are attached close to a tail 110 of the surfboard 100. Examples of fin placement include "the twin" (2 fins), "the thruster" (3 fins) and "the quad" (4 fins). FIG 1 shows a typical design utilising "the thruster" placement. The three fins 200 are placed towards the tail 110 of the surfboard 100. A centre fin 200A is placed in the centre of the surfboard 100. Two further fins 200B and 200C are placed on either side of the surfboard 100 but nearer a nose 120 of the surfboard 100 than the centre fin 200A. FIG 2 shows a side view of the centre fin 200A. The fins 200 are made out of fibre-glass, however it should be appreciated that a person skilled in the art would recognise other suitable materials such as plastic, epoxy, carbonate, timber, aluminum, polystyrene and polyester. The fins 200 have a tip 210 and a base 220. The tip 210 extends vertically downwards from the bottom 130 of the surfboard 100 into the water. The base 220, is used to anchor the fins 200 to the surfboard 100. The fins 200 are either permanently attached to the bottom 130 of the surfboard 100 by fibreglassing the fin 200 in position. Alternatively the fins 200 are attached to the surfboard 100 by using plugs which locate into an inversely identically shaped "fin box" on the surfboard 100 and a grub-screw to secure the fins 200 in place. However, it should be appreciated that the fins 200 can be attached to the surfboard in any manner known in the art.
Each of the fins 200 has many hydrodynamic members in the form of circular dimples 230. Each dimple 230 may be between 5mm and 50mm in diameter. More preferably each dimple 230 is between 20mm and 30mm in diameter and in one embodiment of the present invention the dimples 230 are 25mm in diameter. Furthermore, different diameter dimples 230 may be formed on the same fin 200.
The dimples 230 are on both sides of the centre fin 200A and on the outermost surfaces of the fins 200B and 200C positioned nearest to rails 140 of the surfboard 100. It should be appreciated that the dimples 230 may be placed anywhere on any surface of the fins 200 or part of any surface of the fins 200. The dimples 230 may be randomly placed on the fins 200 or in a predetermined manner or pattern. The dimples 230 can be ordered in such a way that each side of the dimple 230 touches the edge of an adjoining dimple 230 or is positioned such that the edges of the dimples 230 are spaced away from another dimple 230. It should also be appreciated that the dimples 230 could be an oval, a square, a hexagon or any other shape, size or depth. It should be appreciated that changes to the laminar flow of water around the fins 200 create different effects. In further embodiments of the present invention the dimples can be replaced by protruding shapes on the surface of the fins 200 or a combination of protruding shapes and dimples.
FIG 3 shows a cross section of the centre fin 200A dimples 230. The circular dimples 230 are moulded into the centre fin 200A to a predetermined depth such that the strength is not compromised and no dimple extends through the fin 200. The depth of each dimple 230 may be between 1mm and 10mm depending on the type of fin or application used.
FIG 4 shows a cross section of an outer most fin 200C using an alternative embodiment to the present invention. This outer most fin 200C utilises hexagonally shaped dimples 240. The hexagonally shaped dimples 240 penetrate the fins 200 to a pre-determined depth such that the strength is not compromised and no hexagonally shaped dimple 240 extends through to the other side of the fins 200. The hexagonally shaped dimples 240 can be ordered in such a way that each side of the hexagonally shaped dimple 240 touches the edge of an adjoining hexagonally shaped dimple 240 or is positioned such that the edges of the hexagonally shaped dimples 240 are spaced away from the next hexagonally shaped dimple 240. The hexagonally shaped dimples 240, may be arranged to repeat a different larger shape made up of many hexagonally shaped dimples 240.
In use the fins 200 are attached to the bottom 130 of the surfboard 100. Water passing over the fins 200 changes the laminar flow over the dimples 230. It is envisaged that the dimples 230 in the fins 200 cause a separation in the boundary layer of water passing over the dimples 230 reducing drag. The surfer experiences greater stability, maneuverability and speed using a surfboard 100 fitted with fins 200 having dimples 230 over a surfboard fitted with fins 200 made without the dimples 230.
It should be appreciated that various other changes and modifications may be made to the embodiment described without departing from the spirit or scope of the invention.

Claims

I . A watercraft stability device comprising: a body for locating in water, the body having a plurality of hydrodynamic members wherein the hydrodynamic members are dimples.
2. The watercraft stability device of claim 1 wherein the dimples are circular.
3. The watercraft stability device of claim 1 wherein the dimples are hexagonal.
4. The watercraft stability device of claim 1 wherein the dimples are oval.
5. The watercraft stability device of claim 1 wherein the hydrodynamic members are moulded to the body.
6. The watercraft stability device of claim 1 wherein the hydrodynamic members may be structured or randomly distributed.
7. The watercraft stability device of claim 1 wherein the dimples are between 5 mm and 50 mm in diameter.
8. The watercraft stability device of claim 1 wherein the dimples are between 20 mm and 30 mm in diameter.
9. The watercraft stability device of claim 1 wherein the hydrodynamic members may be applied to whole or parts of any surface of the body. 10. The watercraft stability device of claim 1 wherein the body is injection moulded.
I 1. The watercraft stability device of claim 1 wherein the body is made
Substitute Sheet (Rule 26) RO/AU from fibre glass.
12. The watercraft stability device of claim 1 wherein the body is made from plastic.
13. The watercraft stability device of claim 1 wherein the body is a fin.
14. The watercraft stability device of claim 1 wherein the body is a centreboard.
15. The watercraft stability device of claim 1 wherein the body is a rudder.
16. The watercraft stability device of claim 1 wherein the depth of each dimple is between 1mm and 10mm.
17. The watercraft stability device of claim 1 wherein the depth of each dimple is between 2mm and 4mm.
18. The watercraft stability device of claim 1 wherein the dimples substantially touch at least one adjacent dimple.
Substitute Sheet (Rule 26) RO/AU
PCT/AU2008/001817 2007-12-07 2008-12-05 A watercraft stability control device WO2009070852A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2007906666A AU2007906666A0 (en) 2007-12-07 A watercraft stability control device
AU2007906666 2007-12-07

Publications (1)

Publication Number Publication Date
WO2009070852A1 true WO2009070852A1 (en) 2009-06-11

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ID=40717209

Family Applications (1)

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PCT/AU2008/001817 WO2009070852A1 (en) 2007-12-07 2008-12-05 A watercraft stability control device

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WO (1) WO2009070852A1 (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013177612A1 (en) * 2012-05-28 2013-12-05 3Dfins Pty Ltd Watercraft fin
USD702304S1 (en) 2012-05-28 2014-04-08 Courtney James Potter Full dimple fin
USD702305S1 (en) 2012-05-28 2014-04-08 Courtney James Potter Partial dimple fin
WO2016083977A1 (en) 2014-11-24 2016-06-02 Elenco De Qualidade Equipamentos De Controlo Unipessoal, Lda Hull for vessel or board having hydrodynamic elements formed as recesses
US9688365B2 (en) 2012-07-09 2017-06-27 Fin Control Systems Pty Limited Fin plug for water craft
KR20180001134U (en) * 2016-10-14 2018-04-24 대우조선해양 주식회사 Resonance avoidance type pre-swirl stator
US9957021B2 (en) 2012-11-14 2018-05-01 Fin Control Systems Pty. Limited Fin plug for a water craft
US20180237112A1 (en) * 2015-08-18 2018-08-23 Jbooks Holdings Pty Ltd A fin for a surfboard

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US5167552A (en) * 1990-02-01 1992-12-01 Wellington Leisure Products, Inc. Textured water sports board
US5171623A (en) * 1990-12-27 1992-12-15 Yee Norman D Drag reducing surface depressions
US5238434A (en) * 1991-03-15 1993-08-24 Kransco Textured bottom skin for bodyboards and method
US5378524A (en) * 1991-05-28 1995-01-03 Blood; Charles L. Friction reducing surface and devices employing such surfaces
US5611295A (en) * 1995-09-29 1997-03-18 Stables; Lloyd J. Anti-spin/turning enhancer for personal watercraft
US5618215A (en) * 1995-01-10 1997-04-08 Earth & Ocean Sports, Inc. Aquatic sports board
US5638766A (en) * 1992-12-09 1997-06-17 Pusterla; Anthony Francis Water craft with disc surface skimmers
US6415730B1 (en) * 2000-11-29 2002-07-09 Westerngeco L.L.C. Dimpled marine seismic fairing
US7044073B2 (en) * 2002-04-26 2006-05-16 Board Of Regents Of The University Of Texas System Methods for reducing the viscous drag on a surface and drag reducing device

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Publication number Priority date Publication date Assignee Title
US2261558A (en) * 1939-02-28 1941-11-04 Orloff Benjamin Fluid supported vehicle and method of producing the same
WO1980001673A1 (en) * 1979-02-13 1980-08-21 A Malmstroem Surface structure of a surface adapted for movement relative to a fluid
US5167552A (en) * 1990-02-01 1992-12-01 Wellington Leisure Products, Inc. Textured water sports board
US5171623A (en) * 1990-12-27 1992-12-15 Yee Norman D Drag reducing surface depressions
US5238434A (en) * 1991-03-15 1993-08-24 Kransco Textured bottom skin for bodyboards and method
US5378524A (en) * 1991-05-28 1995-01-03 Blood; Charles L. Friction reducing surface and devices employing such surfaces
US5638766A (en) * 1992-12-09 1997-06-17 Pusterla; Anthony Francis Water craft with disc surface skimmers
US5618215A (en) * 1995-01-10 1997-04-08 Earth & Ocean Sports, Inc. Aquatic sports board
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US6415730B1 (en) * 2000-11-29 2002-07-09 Westerngeco L.L.C. Dimpled marine seismic fairing
US7044073B2 (en) * 2002-04-26 2006-05-16 Board Of Regents Of The University Of Texas System Methods for reducing the viscous drag on a surface and drag reducing device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013177612A1 (en) * 2012-05-28 2013-12-05 3Dfins Pty Ltd Watercraft fin
USD702304S1 (en) 2012-05-28 2014-04-08 Courtney James Potter Full dimple fin
USD702305S1 (en) 2012-05-28 2014-04-08 Courtney James Potter Partial dimple fin
JP2015517954A (en) * 2012-05-28 2015-06-25 サイドウェイズ スポーツ リミテッドＳｉｄｅｗａｙｓ Ｓｐｏｒｔｓ Ｌｉｍｉｔｅｄ Watercraft fins
EP2855256A4 (en) * 2012-05-28 2016-03-23 Sideways Sports Ltd Watercraft fin
US9688365B2 (en) 2012-07-09 2017-06-27 Fin Control Systems Pty Limited Fin plug for water craft
US9862467B2 (en) 2012-07-09 2018-01-09 Fin Control Systems Pty Limited Securing mechanism for water craft fin
US10377452B2 (en) 2012-07-09 2019-08-13 Fin Control Systems Pty Limited Fin plug for water craft
US9957021B2 (en) 2012-11-14 2018-05-01 Fin Control Systems Pty. Limited Fin plug for a water craft
WO2016083977A1 (en) 2014-11-24 2016-06-02 Elenco De Qualidade Equipamentos De Controlo Unipessoal, Lda Hull for vessel or board having hydrodynamic elements formed as recesses
US20180237112A1 (en) * 2015-08-18 2018-08-23 Jbooks Holdings Pty Ltd A fin for a surfboard
KR20180001134U (en) * 2016-10-14 2018-04-24 대우조선해양 주식회사 Resonance avoidance type pre-swirl stator
KR200493217Y1 (en) * 2016-10-14 2021-02-19 대우조선해양 주식회사 Resonance avoidance type pre-swirl stator

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