EP0169855A1 - Planche de surf et derive - Google Patents

Planche de surf et derive

Info

Publication number
EP0169855A1
EP0169855A1 EP85900592A EP85900592A EP0169855A1 EP 0169855 A1 EP0169855 A1 EP 0169855A1 EP 85900592 A EP85900592 A EP 85900592A EP 85900592 A EP85900592 A EP 85900592A EP 0169855 A1 EP0169855 A1 EP 0169855A1
Authority
EP
European Patent Office
Prior art keywords
fin
surfboard
main portion
wing members
leading
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP85900592A
Other languages
German (de)
English (en)
Inventor
Ben Lexcen
Cheyne Darren Horan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STAR FIN Pty Ltd
Original Assignee
STAR FIN Pty Ltd
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 STAR FIN Pty Ltd filed Critical STAR FIN Pty Ltd
Publication of EP0169855A1 publication Critical patent/EP0169855A1/fr
Withdrawn legal-status Critical Current

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
    • 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

Definitions

  • the present invention is directed to a hydrodyna icall efficient fin for surfboards, surf skis or the like, and a surfboard having such a fin.
  • fin design has been largely empirical, i. on a "trial-and-error" basis, rather than scientific.
  • the present invention provides a hydrodynamically efficient fin designed on a scientific basis using the aerodynamic, characteristics of an aeroplane wing, namely the "Spitfire” aeroplane wing, and the stability characteristics of a wingle system. It is known, for example from Australian Patent
  • winglets are added to stabilize the surfboard. Since th winglets of the prior art surfboard are merely added to a conventional fin without any overall integrated design, the resultant fin is less efficient hydrodynamically, and speed was sacrificed for stability.
  • the winglets are formed integrally with the fin and have a side profile which is an extension of the fin profile.
  • An improved board is also provided, the board being designed to exploit the speed advantages of the fin.
  • an improved fin for use on aquatic craft such as surfboards, surf skis or the like, characterised in that said fin has a main portion with an aeroplane wing profile, i.e. a substantially straight leading edge and a trailing edge curve towards the leading edge, an aerofoil cross-section, and a pair of wing members, said wing members extending laterally outwardly from the main portion of the fin on opposite sides at the bottom thereof, wherein the leading and trailing edges of the wing members are extensions of the leading and trailin edges, respectively, of the main portion.
  • an aeroplane wing profile i.e. a substantially straight leading edge and a trailing edge curve towards the leading edge, an aerofoil cross-section, and a pair of wing members, said wing members extending laterally outwardly from the main portion of the fin on opposite sides at the bottom thereof, wherein the leading and trailing edges of the wing members are extensions of the leading and trailin edges, respectively, of the main portion.
  • laterally outwardly is not limited to wing members which are perpendicular to the fin body, but includes a wing member having a component in a direction perpendicular to the plane of the main portion.
  • the wing members extend outwardly and downwardly from the fin so that the fin and two wing members are equally spaced circumferentially.
  • cavitation is greatly reduced. (Cavitation is the formation of vacuums by a body travelling through a fluid). Reduction of cavitation results in a corresponding reduction in "drag” which translates into increased forward driving power. As a result, the surfboard rider can achieve greater speeds with the fin of the present invention.
  • the winglet design also increases aneouvrability since a smaller turning circle is required. Further, the wings serve to "hold" the board to the wave resulting in greater stability and control over the board.
  • the fin of the present invention can be made by any suitable known technique, such as fibreglass moulding.
  • the fin is made from injection moulded plastic.
  • an improved surfboard said surfboard having a fin as described above, rounded rails and a rounded nose.
  • the term “rails" refers to the bottom side edges of th surfboard. Such a surfboard presents less resistance to wa flow thereby allowing greater acceleration through turns an higher speeds on waves.
  • Fig. 1 is a front, elevation of the fin of a preferred embodiment
  • Fig. 2 is a cross sectional view along A-A of Fig. 1
  • Fig. 3 is a cross sectional view along B-B of Fig. 1
  • Fig. 4 is a perspective view of the winged fin of Fig.
  • Fig. 5 is a side elevational view of the winged fin of Fig. 1 showing its profile
  • Fig. 6 is a plan view of a surfboard according to another embodiment of the present invention.
  • Fig. 7 is a side view of the surfboard of Fig. 6
  • Fig. 8 is an end view of the surfboard of Fig. 6
  • Fig. 9 is a part cross-sectional view of a rail of a prior art surfboard
  • Fig. 10 is a plan view of the nose of a prior art surfboard.
  • Fig. 11 is a part cross-sectional view of a rail of th surfboard of Fig. 6, and Fig. 12 is a plan view of the nose of the surfboard of Fig. 6.
  • the fin 10 of the preferred embodiment comprises a main fin portion 12 having winglets, i.e. a pair of wing members 14, 16 at its lower end.
  • the wi members 14, 16 extend downwardly and outwardly from the fin body 12.
  • the wing members 14, 16 are orientated at an angle of 120° to the fin body 12, an to each other.
  • the cross sectional shape of the fin 10 (see Figs. 2
  • S 3 is of aerofoil shape for optimum performance through th water.
  • the side profile of the fin shown in Fig. 5, is of aeroplane wing shape, e.g. similar to that of the Spitfire aeroplane. It has a substantially straight leading edge perpendicular to the direction of motion and a trailing edge which curves forward towards the leading edge.
  • the wing members are designed integrally with the fin body, i.e. the leading and trailing edges of the wing members are extensions of the leading and trailing edges, respectively, o the main fin body. The use of wing members, and the integrated design, leads to a reduction in cavitation and dra and a corresponding increase in the speeds which can be achieved.
  • the fin of the present invention is designed to achieve higher, speeds ye with a sufficient degree of control.
  • the main fin body has the profile of an aeroplane-wing to minimiz drag, and the wing members are added for stability but designed integrally with the main fin body so as not to hampe its performance.
  • the fin is made of plastics material according to known techniques, e.g. injection moulding.
  • the surfboard 20 of a further embodiment is shown in Fig. 6. It tapers from a wide tail 22 to a rounded nose 24, as shown also in Fig. 12. It is to be noted that unlike the pointed nose of prior art surfboards (see Fig. 10) the nose o the surfboard of the preferred embodiment is rounded and tend to prevent the board from "digging" into the wave.
  • the rails 26 of the illustrated surfboard are thickened and rounded (Fig. 11), in comparison to the square edge rails of the prior art surfboards (Fig. 9). The rounded rail presents less water resistance and allows the board to "roll” into the wave during turns, rather than digging into the water. This enables the board to take advantage of the higher speeds which can be attained with the fin described above.
  • the angle of the wing members on the fin can be varied.
  • the fin is also suitable for other craft such as sailboards, surf or wave skis, and the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Toys (AREA)

Abstract

Une dérive hydrodynamiquement efficiente (10) pour une planche de surf, un ski de surf ou analogues comprend un corps de dérive (12) et une paire d'organes d'ailettes (14, 16) s'étendant latéralement vers l'extérieur sur les côtés opposés du corps de dérive (12) à l'extrémité inférieure de celui-ci. Le corps de dérive (12) possède un profil d'aile d'avion et une section transversale de surface portante. Une planche de surf améliorée comprend une dérive à ailettes du type ci-décrit, ainsi que des lisses arrondies, augmentant la stabilité et la manoeuvrabilité.
EP85900592A 1984-01-26 1985-01-25 Planche de surf et derive Withdrawn EP0169855A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU3347/84 1984-01-26
AUPG334784 1984-01-26

Publications (1)

Publication Number Publication Date
EP0169855A1 true EP0169855A1 (fr) 1986-02-05

Family

ID=3770484

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85900592A Withdrawn EP0169855A1 (fr) 1984-01-26 1985-01-25 Planche de surf et derive

Country Status (4)

Country Link
EP (1) EP0169855A1 (fr)
IT (1) IT1199651B (fr)
WO (1) WO1985003237A1 (fr)
ZA (1) ZA85629B (fr)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2302315B (en) * 1993-04-23 1997-06-18 Richard John Winston Harvey A method of adapting a boardsail
US6254446B1 (en) * 2000-03-09 2001-07-03 Kendon Thigpen Wakeboard fin
WO2003057559A1 (fr) 2002-01-14 2003-07-17 C & C Fin Designs Pty Ltd Assemblage de derive
AU2005220278B1 (en) * 2005-10-11 2006-09-14 Cremin, Michael Gordon Surfboard fin assembly
US7509917B2 (en) 2007-03-09 2009-03-31 Magnasail, Llc Apparatus and method to optimize sailing efficiency
AU2013204785C1 (en) 2012-07-09 2019-09-05 Fin Control Systems Pty. Limited Fin Plug for Water Craft
AU2013204755A1 (en) 2012-11-14 2014-05-29 Fin Control Systems Pty. Limited A Fin Plug for a Water Craft
US10800495B1 (en) * 2014-11-29 2020-10-13 Paul Thomas Enhanced planing devices and systems
FR3120350A1 (fr) * 2021-03-03 2022-09-09 matthias gibaud Ailette asymétrique Divisions pour ailerons.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3121890A (en) * 1961-09-01 1964-02-25 Jr Joseph F Rumsey Water ski
AU3166371A (en) * 1971-07-26 1973-02-01 Richards Designs Pty. Ltd Improvements in surfboard design
AU485984B2 (en) * 1974-02-08 1975-08-14 Dynafoil, Inc Hydrofoil watercraft
NL8200457A (nl) * 1982-02-05 1983-09-01 Norport Pty Ltd Zeiljacht.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8503237A1 *

Also Published As

Publication number Publication date
IT1199651B (it) 1988-12-30
ZA85629B (en) 1985-09-25
WO1985003237A1 (fr) 1985-08-01
IT8519250A0 (it) 1985-01-28

Similar Documents

Publication Publication Date Title
US4320546A (en) Surfboard
US7207526B2 (en) High efficiency tip vortex reversal and induced drag reduction
US7793604B2 (en) Planing sailboard
US8821205B2 (en) Low-drag fin and foil system for surfboards
US6379204B2 (en) Stabilizing element for use on mobile devices
US7244157B2 (en) High-lift, low drag fin for surfboard and other watercraft
AU760365B2 (en) Water vehicle stabilizer and accelerator
EP0169855A1 (fr) Planche de surf et derive
US6767266B2 (en) Stabilizing element for use on mobile devices
WO2007130700A2 (fr) Systeme d'aileron destine a une planche de surf
KR960001562B1 (ko) 선박용 방향타
EP0459076A1 (fr) Catamaran stable de course avec des propriétés de hydroplane
RU2104898C1 (ru) Серфинг с плавником
WO1999022986A1 (fr) Engin flottant
US5003904A (en) Keel assembly
US6964240B1 (en) Hull for high speed water craft
AU2012219417B2 (en) Low-drag fin and foil system for surfboards
JPH01244957A (ja) 端板を有する地面効果翼機
US5464358A (en) Airfoil jump ski
US1749017A (en) Speed boat
US20260116500A1 (en) Hydro Foil Having One or More Wings with Dual in Line Protrusions with Continuous Leading Edge
US20110030600A1 (en) Sailboard with slotted winglets
WO2006066140A2 (fr) Derive a faible trainee et systeme d'ailerons pour planches de surf
JPH04104097U (ja) ラム翼型高速艇
USRE33768E (en) Water ski construction

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): AT BE CH DE FR GB LI LU NL SE

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19860102

RIN1 Information on inventor provided before grant (corrected)

Inventor name: LEXCEN, BEN

Inventor name: HORAN, CHEYNE DARREN