EP0079113A1 - Aileron pour un support flottant - Google Patents

Aileron pour un support flottant Download PDF

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Publication number
EP0079113A1
EP0079113A1 EP82302693A EP82302693A EP0079113A1 EP 0079113 A1 EP0079113 A1 EP 0079113A1 EP 82302693 A EP82302693 A EP 82302693A EP 82302693 A EP82302693 A EP 82302693A EP 0079113 A1 EP0079113 A1 EP 0079113A1
Authority
EP
European Patent Office
Prior art keywords
fin
core body
outer layer
trailing edge
core
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Withdrawn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
EP82302693A
Other languages
German (de)
English (en)
Inventor
John Robert Davies
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0079113A1 publication Critical patent/EP0079113A1/fr
Withdrawn legal-status Critical Current

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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
    • B63B32/66—Arrangements for fixation to the board, e.g. fin boxes or foil boxes

Definitions

  • the present invention relates to a fin for a buoyant support.
  • buoyant support as used in this Specification is intended to include any form of floating guided vessel or board, and in particular is intended to include surfboards, surf sailing boards (the so-called “wind surfers”) surf canoes as well as more conventional vessels which may have a fin or keel for guidance purposes, for example sailing dinghys and the like.
  • the term “fin” will be understood to refer to any guide surface introduced from a buoyant support into the water, and includes not only a fixed fin or skeg, but also a keel (with a fixed keel or a drop keel) a dagger board, barge board or even a rudder.
  • All of these guide fins have a common function in providing a reaction surface against which water pressure acts to maintain a buoyant support on a selected course, or in some cases to vary the course in a selected manner.
  • Such guide veins have a leading edge and a tailing edge and are constituted by a generally flat plate-like element usually with a stream line cross section.
  • the conventional construction for such fins involves the formation thereof in a rigid and solid manner, for example by the use of marine plywood or, more commonly, a plastics, which may be a moulded plastics or grp (glass reinforced plastics - the so-called fibre glass). ;
  • the main design criteria of such fins has until now been to provide a maximum lateral resistance to movement whilst obtaining a minimum forward resistance to movement in consideration of the underwater flow pattern experienced by the fin at its particular location.
  • the first criterion is that of providing maximum lateral resistance in order adequately to obtain the guiding effect with the minimum surface area.
  • a low aspect ratio is required, that is one in which the fin is relatively short from front to back and relatively wide or deep in the transverse dimension.
  • the present invention seeks to provide a fin as hereinabove defined in which the conflicting requirements for guidance and manoeuvrability can be accommodated by virtue of its particular structure.
  • a fin for a buoyant support as hereinbefore defined comprises a generally flat body having a leading edge and a trailing edge, in which a trailing edge portion of the fin, including the trailing edge itself, is resiliently flexible.
  • the proportion of the area of the fin constituted by the said trailing edge portion may, in fact, exceed 50% in some cases, although in a preferred embodiment of the invention the trailing edge portion amounts to between 20% and 30% of the area of the fin.
  • the fin preferably has a stream lined cross section tapering towards the leading and trailing edges.
  • the leading edge portion of the fin is also made resilient.
  • the area of the leading edge portion will, of course, be rather smaller than that of the trailing edge portion since it is not required for this to be resiliently flexible but merely resilient, the degree of resilience offering a cushioned impact in the event that the fin strikes a non moving object.
  • the said trailing edge portion is further provided with a plurality of ribs extending in the direction of travel, these ribs extending outwardly from the trailing edge portion and defining between them a plurality of channels for guiding the water flow.
  • the fin body may be provided with means for removably attaching the fin to the said board such means may incorporate. fittings for a fin box of known construction.
  • a fin suitable for a buoyant support as hereinbefore defined comprises a generally flat (including stream lined) body portion and a resiliently flexible portion attached or integrally formed therewith.
  • the manner in which the resiliently flexible portion is attached to the rigid portion may include adhesives, or may include moulding or casting one or other of the two portions in a mould into which the other said portion has been fitted or previously cast.
  • the interengagement between the two portions may include. form engagement in the form of dovetails or other re-entrant channels, apertures in the core body and/or projections on the core body.
  • the present invention also comprehends a fin suitable for a buoyant support as hereinbefore defined, comprising a generally flat (including stream lined) body having a leading edge and a trailing edge, the body constituting a core of the fin which is entirely or substantially entirely covered with a coating of a resiliently flexible material which extends beyond the leading and trailing edges of the core to define, on its own, at least a trailing edge portion of the fin which is resiliently flexible with respect to the remainder of the fin.
  • Such cover also preferably includes a resilient leading edge portion extending a short distance in advance of the leading edge of the core.
  • the embodiment shown comprises a generally rigid reinforcing core member 11 having a conventional curved "sharks fin” shape including a curved leading edge 12, a curved trailing edge 13 and a substantially straight root edge 14.
  • the leading and trailing edges 12,13 respectively meet at a curved tip portion 15.
  • the reinforcing body 11 is entirely encased in a layer 29 of resilient flexible material which coats the two faces 21, 22 of the core body 11 between the leading edge 12 and the trailing edge 13 thereof, and extends forwardly to form the leading edge 23 of the fin itself, and rearwardly to constitute the trailing edge portion 24 and form the trailing edge 25 itself.
  • This trailing edge portion 24 tapers, as can be seen in Figure 2, from a thickness slightly greater than that of the trailing edge 13 of the core body 11 to a further edge at the trailing edge 25 itself.
  • Spaced along this trailing edge portion 24 are a plurality of ribs 26 which extend from the feathered trailing edge 25 itself to a point approximately coincident with the trailing edge 13 of the core body 11. These ribs 26 define between them a plurality of channels 27 which serve to increase the guiding effect of the fin.
  • the ribs 26, act as additional flexural reinforcement of the trailing edge portion 24 of the fin.
  • the trailing edge portion 24 also extends beyond the tip portion 15 of the core body 11 to form a resilient fin tip portion 28 which has adequte resistance to provide guidance for the flow of water during use, but is safely flexible in the event of contact with another surfer or with a fixed object such as a rock or the ground.
  • the trailing edge portion of the fin is not integrally moulded as part of an outer casing as in the case of the embodiment illustrated, but rather is separately formed and interlocked at the trailing edge of the core body 11 by means of adhesive and/or form engagement such as dovetails or t slots in this non illustrated embodiment the outer faces of the core body 11, corresponding to the faces 21, 22 constitute the outer surface of the forward portion of the fin and are flush with the lateral surfaces of the trailing edge portion.
  • the core body 11 When the fin is travelling through water the core body 11 provides sufficient rigidity for adequate guidance in a straight line, and the trailing edge portion 24 flexes to one side or the other to provide a curved stream line avoiding the formation of cavitation which would detract from the performance of the fin and increase the drag of the surfboard or other buoyant support on which the fin is fitted.
  • the core body 11 is substantially rigid, it preferably has a degree of flexural resilience sufficient to accommodate hard shocks such as on ground contact without breakage.
  • the fin illustrated in Figures 1 and 2 can be made in a two-part process comprising the casting or moulding of the core body 11 (or alternatively, this may be shaped by cutting or grinding down from a blank) and the attachment support 16 may be integrally formed with the core body 11 or attached thereto and reinforced by one or more reinforcing strips (not shown).
  • the core body 11 After the core body 11 has been formed it is inserted into a mould having the final shape of the desired fin and a urethane material injected into the mould to form the outer covering including the leading edge portion 23 and trailing edge portion 24 and the ribs 26.
  • the coating may also cover the attachment block 16 or may finish flush or square with the surface of this.
  • the flexible urethane coating need not, of course,
  • the fin of the present invention will look no different from conventional fins, but will have the improved performance and added safety features discussed.
  • the fin illustrated in the drawings is shown as a symmetrical fin, the present invention also comprehends an asymmetrical fin.
  • Some surfboards are fitted with twin fins, and for such boards asymmetrical fins have substantial advantages from the point of view of obtaining directional stability.
  • the fin structure illustrated in Figures 3 and 4 comprise a core body 11 having a leading edge 12 and trailing edge 13, and extending from a root edge 14 to which is integrally moulded a suitably shaped attachment block 16 for attachment of the finished fin to a fin box in a manner which will be described in more detail below, and a tip 15.
  • the shape of the completed fin is shown in broken outline in Figure 3, the fin being completed as in the embodiment of Figures 1 and 2 by an outer covering 29 of flexible resilient urethane material moulded over the core body 11.
  • the core body 11 is provided with a number of apertures 30, 31,32 extending along its "length" that is in a general direction of the extent of the fin from the root edge of the core body 11 to the tip 15 thereof.
  • the opening 30 lies substantially parallel to and adjacent the leading edge of the core body 11 where this is substantially straight
  • the opening 31 lies parallel to and adjacent the trailing edge 13 of the core body
  • the opening 32 lies closer to the tip 15 and is equally spaced between the leading edge 12 and the trailing edge 13.
  • Extending along an intermediate line of the core body 11 are a plurality of lateral projections 34, 35 (in the illustrated embodiment two such projections are shown, although they mmay be provided any number from one upwards) and these projections have generally flat faces 36, 37 which are exposed by the outer cover 29 and lie substantially flush with the surface of this outer layer in the finished fin.
  • This not only provides for complete security of the interconnection between the outer flexible resilient layer of urethane material which defines the outer shape of the fin, and the internal core body 11, but also provides a decorative feature if the urethane material of the outer cover is substantially opaque and of a different colour from that of the core body 11.
  • Variations in the degree of longitudinal stiffness can be achieved by varying the length of the core body 11 which, in this embodiment, has flat parallel faces 21, 22 (although, as in the embodiment of Figures 1 and 2, the faces could be curved to a streamline shape if desired) a longer core body providing a greater degree of stiffness and a shorter core body allowing a greater degree of flexural resilience.
  • the attachment block 16 shown in the embodiment of Figures 3 and 4 is of a conventional type having a transverse pin 17 extending through the end adjacent the trailing edge of the fin and a forwardly projecting "nose" 18 at the leading edge of the fin, through which passes an aperture 20 for receiving a fixing screw.
  • Conventional fin boxes with which surfboards are provided have an elongate slot with an undercut lip along which the transverse pin can slide (a suitable enlarged portion being provided for introducing the pin into the slot.
  • a captive nut also slides in the slot and can be clamped by means of a screw passing though the aperture 20.
  • the fin box is substantially longer than the attachment block 16 so that adjustments to the longitudinal position of the fin can be made by slackening the screw and sliding the attachment box 16 along the slot before retightening the screw.
  • FIG. 5 there is shown an alternative construction in which the attachment block 16 is provided with a plurality of inclined slots 40 having enlarged inner ends 41, and a fin box has a plurality of transverse rods or bars 19 equally spaced along the length thereof and spanning the slot in the fin box the slots 40 taper gradually from a wider mouth to a narrower throat immediately adjacent the enlarged ends 41, the throat being slightly smaller in transverse dimension than the diameter of the retaining rods 19 in the fin box so that the fin can be snap engaged by pushing the fin with the slots 40 engaged over the cooperating rods 19 until the rods 19 enter the enlarged ends 41.
  • This construction has the advantage of being adjustable along the length of the fin box through a number of predetermined positions and also of being releasable from the fin box upon impact above a predetermined threshold.
  • damage caused by the fin can be totally avoided since it not only has the resilient leading edge, but also is snap releasable from the surf board if the surf board should strike with the fin against any other object with a force sufficiently great to do any damage to the fin or to the object, the snap disengagement absorbing the force of the impact.
  • the slots 40 are inclined at approximately 45 0 so that the force applied to fit the fin in the fin box can be applied conveniently in a direction substantially perpendicular to the resilient leading edge which is itself rounded and sufficiently soft to provide a comfortable surface against which a bare hand can press in fitting the fin to the fin box.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laminated Bodies (AREA)
  • Bridges Or Land Bridges (AREA)
EP82302693A 1981-05-27 1982-05-26 Aileron pour un support flottant Withdrawn EP0079113A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8116083 1981-05-27
GB8116083 1981-05-27

Publications (1)

Publication Number Publication Date
EP0079113A1 true EP0079113A1 (fr) 1983-05-18

Family

ID=10522067

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82302693A Withdrawn EP0079113A1 (fr) 1981-05-27 1982-05-26 Aileron pour un support flottant

Country Status (3)

Country Link
EP (1) EP0079113A1 (fr)
AU (1) AU8415382A (fr)
ES (1) ES8304859A1 (fr)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326894A1 (de) * 1983-07-26 1985-02-14 Klepper Beteiligungs Gmbh & Co Bootsbau Kg, 8200 Rosenheim Finne mit klemmhalterung
DE3326893C1 (de) * 1983-07-26 1985-03-14 Klepper Beteiligungs Gmbh & Co Bootsbau Kg, 8200 Rosenheim Finne, insbesondere für ein Segelbrett
WO1992019492A1 (fr) * 1991-04-29 1992-11-12 852629 Ontario Inc. Derive a profil variable
FR2680494A1 (fr) * 1991-08-19 1993-02-26 F2 Int Gmbh Aileron pour planche a voile.
US5273472A (en) * 1991-11-06 1993-12-28 Surfco Hawaii Surfboard fins with flexible edges
US5306188A (en) * 1991-11-06 1994-04-26 Surfco Hawaii Method of applying a safety/maneuver enhancing fin to a surfboard
WO2008125123A1 (fr) * 2007-04-11 2008-10-23 University Of Tartu Dispositif accessoire pour agrandir la surface de l'aileron d'une planche de surf ou d'un engin nautique similaire
WO2008156603A1 (fr) * 2007-06-13 2008-12-24 Fin & Fin Surfboard Fin Company Dérive modulaire pour une planche de glisse, une planche à voile ou un autre dispositif aquatique
WO2009076706A1 (fr) * 2007-12-14 2009-06-25 Michael John Hort Caisson de dérive
WO2010115242A1 (fr) * 2009-04-09 2010-10-14 Surf Hardware International Pty Ltd Dispositifs à ailerons
US9266588B2 (en) 2012-12-03 2016-02-23 Flux Innovations Pty Ltd. Adjustable surfing fin
WO2017045011A1 (fr) * 2015-09-15 2017-03-23 Flying Fin Systems Pty Ltd Système d'aileron réglable
WO2017165915A1 (fr) * 2016-04-01 2017-10-05 Flying Fin Systems Pty Ltd Dérive élastiquement souple
EP3145806A4 (fr) * 2014-05-15 2018-02-14 Flying Fin Systems Pty Ltd. Système d'aileron réglable
US10106230B2 (en) * 2015-06-02 2018-10-23 Randal Richenberg Biomimic design stabilizing fin or keel for surface planing or submerged watercraft
AT525026A1 (de) * 2021-05-14 2022-11-15 Efoiler Gmbh Unterwasser-Tragfläche für ein Wasserfahrzeug
WO2023149280A1 (fr) * 2022-02-03 2023-08-10 勝慶 熊野 Ailette

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659300A (en) * 1969-07-25 1972-05-02 W A V E Corp Fin attachment structure for surfboards
US3965514A (en) * 1975-01-30 1976-06-29 Shafer Arthur B Adjustable and/or removable fin for surfboards
DE2826117A1 (de) * 1978-06-14 1979-12-20 Hannes Marker Finne fuer segelbretter
US4209867A (en) * 1978-03-20 1980-07-01 Abrams Henry H Iii Flexible surfboard

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3659300A (en) * 1969-07-25 1972-05-02 W A V E Corp Fin attachment structure for surfboards
US3965514A (en) * 1975-01-30 1976-06-29 Shafer Arthur B Adjustable and/or removable fin for surfboards
US4209867A (en) * 1978-03-20 1980-07-01 Abrams Henry H Iii Flexible surfboard
DE2826117A1 (de) * 1978-06-14 1979-12-20 Hannes Marker Finne fuer segelbretter

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3326894A1 (de) * 1983-07-26 1985-02-14 Klepper Beteiligungs Gmbh & Co Bootsbau Kg, 8200 Rosenheim Finne mit klemmhalterung
DE3326893C1 (de) * 1983-07-26 1985-03-14 Klepper Beteiligungs Gmbh & Co Bootsbau Kg, 8200 Rosenheim Finne, insbesondere für ein Segelbrett
WO1992019492A1 (fr) * 1991-04-29 1992-11-12 852629 Ontario Inc. Derive a profil variable
FR2680494A1 (fr) * 1991-08-19 1993-02-26 F2 Int Gmbh Aileron pour planche a voile.
US5273471A (en) * 1991-08-19 1993-12-28 F2 International Ges. M.B.H. Fin for a windsurf board
US5273472A (en) * 1991-11-06 1993-12-28 Surfco Hawaii Surfboard fins with flexible edges
US5306188A (en) * 1991-11-06 1994-04-26 Surfco Hawaii Method of applying a safety/maneuver enhancing fin to a surfboard
WO2008125123A1 (fr) * 2007-04-11 2008-10-23 University Of Tartu Dispositif accessoire pour agrandir la surface de l'aileron d'une planche de surf ou d'un engin nautique similaire
WO2008156603A1 (fr) * 2007-06-13 2008-12-24 Fin & Fin Surfboard Fin Company Dérive modulaire pour une planche de glisse, une planche à voile ou un autre dispositif aquatique
US8469757B2 (en) 2007-06-13 2013-06-25 Fin & Fin Surf Board Fin Company Modular fin for a surfboard, sailboard or other water-borne device
US8465334B2 (en) 2007-12-14 2013-06-18 Origin Fin Systems Pty Ltd. Fin box
WO2009076706A1 (fr) * 2007-12-14 2009-06-25 Michael John Hort Caisson de dérive
CN102458978A (zh) * 2009-04-09 2012-05-16 冲浪器材国际私人有限公司 翅片设备
WO2010115242A1 (fr) * 2009-04-09 2010-10-14 Surf Hardware International Pty Ltd Dispositifs à ailerons
US8764502B2 (en) 2009-04-09 2014-07-01 Surf Hardware International Pty Ltd. Fin devices
AU2010234222B2 (en) * 2009-04-09 2014-12-18 Surf Hardware International Pty Ltd Fin devices
US9266588B2 (en) 2012-12-03 2016-02-23 Flux Innovations Pty Ltd. Adjustable surfing fin
EP3145806A4 (fr) * 2014-05-15 2018-02-14 Flying Fin Systems Pty Ltd. Système d'aileron réglable
US9926051B2 (en) 2014-05-15 2018-03-27 Flying Fin Systems Pty Ltd Adjustable fin system
US10676165B2 (en) 2014-05-15 2020-06-09 Flying Fin Systems Pty Ltd Adjustable fin system
US10106230B2 (en) * 2015-06-02 2018-10-23 Randal Richenberg Biomimic design stabilizing fin or keel for surface planing or submerged watercraft
WO2017045011A1 (fr) * 2015-09-15 2017-03-23 Flying Fin Systems Pty Ltd Système d'aileron réglable
US10654547B2 (en) 2015-09-15 2020-05-19 Flying Fin Systems Pty Ltd Adjustable fin system
WO2017165915A1 (fr) * 2016-04-01 2017-10-05 Flying Fin Systems Pty Ltd Dérive élastiquement souple
US10926846B2 (en) * 2016-04-01 2021-02-23 Flying Fin Systems Pty Ltd Resiliently flexible fin
AT525026A1 (de) * 2021-05-14 2022-11-15 Efoiler Gmbh Unterwasser-Tragfläche für ein Wasserfahrzeug
WO2023149280A1 (fr) * 2022-02-03 2023-08-10 勝慶 熊野 Ailette

Also Published As

Publication number Publication date
AU8415382A (en) 1982-12-02
ES512577A0 (es) 1983-04-16
ES8304859A1 (es) 1983-04-16

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