EP0092785A2 - Aileron pour embarcation - Google Patents

Aileron pour embarcation Download PDF

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Publication number
EP0092785A2
EP0092785A2 EP83103834A EP83103834A EP0092785A2 EP 0092785 A2 EP0092785 A2 EP 0092785A2 EP 83103834 A EP83103834 A EP 83103834A EP 83103834 A EP83103834 A EP 83103834A EP 0092785 A2 EP0092785 A2 EP 0092785A2
Authority
EP
European Patent Office
Prior art keywords
fin
profile
finn
section
travel
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.)
Ceased
Application number
EP83103834A
Other languages
German (de)
English (en)
Other versions
EP0092785A3 (en
Inventor
Albert Reiter
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.)
REITER, ALBERT
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 EP0092785A2 publication Critical patent/EP0092785A2/fr
Publication of EP0092785A3 publication Critical patent/EP0092785A3/de
Ceased 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
    • B63B32/64—Adjustable, e.g. by adding sections, by removing sections or by changing orientation or profile

Definitions

  • the invention relates to a fin profiled in the form of a symmetrical wing for watercraft, in particular for (wind) surfboards, which is rigidly arranged on the water side of the vehicle floor in order to achieve directional stability.
  • this fin is formed from a correspondingly shaped piece of sheet metal, which is generally arranged on the rear side of the watercraft.
  • the consideration when arranging such fins was that the flow conditions below the critical Reynold number made the arrangement of such a fin made of sheet metal appear more favorable than that of a profiled fin. This is also true if there is a laminar flow on the underside of the vessel. In most watercraft, however, the flow at the rear of the vehicle floor is no longer laminar, but is clearly turbulent.
  • the profile is hydrodynamically changed towards the free end, with a steady or abrupt transition from a slim, low-resistance symmetrical profile at the vehicle floor and a relatively thicker symmetry profile with a high lift coefficient at the free end.
  • a fin 3, 4 is provided to stabilize the direction of this vehicle. 5, 6, 7, 8, 9 arranged.
  • the fin points like a sword away from the vehicle floor and is similar to a wing, symmetrical, profiled with the profile nose in the direction of arrow 2.
  • this symmetrical profile is hydrodynamically twisted towards the free end, in such a way that a slim, low-resistance profile is arranged near the vehicle floor and a thicker symmetry profile is arranged at the free fin end.
  • Fig. 1 shows a sword-like fin, the front edge of which runs at an obtuse angle against the direction of travel.
  • a fin is expedient in waters in which aquatic plants are to be expected, since in such an embodiment the aquatic plants wrapping around the fin can drift downwards / backwards.
  • the fin 3 On the vehicle floor, the fin 3, as can be seen from the cross section shown on the right, is provided with a slim, club-shaped profile 10, which merges towards the free fin end into a symmetry profile 11, which is thick relative to this, and has a high lift coefficient.
  • the slim profile 10 has a pressure point 12 located far back, which gradually shifts forward to the free fin end into the nose area.
  • the rest of the fin area towards the fin end is practically laminar flow, whereby the laminar flow finds a profile 11 with a high lift coefficient, so the fin 3 can work optimally or give the vehicle the desired directional stability.
  • the forwardly inclined pressure line 14 also ensures that the turbulent flow with gas bubbles present on the vehicle floor 1 does not migrate downward along the fin 3, but at most follows the fin 3 as a vortex braid in the vicinity of the vehicle floor 1. This is even more clearly the case with the fin 4 according to FIG. 2, whose nose leading edge 16 is also inclined in the direction of travel 2, with a correspondingly greater inclination of the pressure line 17 between the constantly changing profiles 10, 11.
  • FIG. 3 shows where a nose area 18 inclined forward and a vertical nose area 19 can be seen.
  • the pressure line 20 of the profiles 10, 11, 21 shown here in cross-section also extends at an angle approximately following the nose areas.
  • a fin 6 is shown with two constant profile sections 22 and 23.
  • the two profile sections 22, 23, wherein the near-ground profile section 22 in turn has a slim, low-resistance profile 10 and the end section 23 has a relatively thick buoyancy profile 11, are by a Plate 24, which acts as a boundary layer fence, is hydrodynamically separated from one another.
  • the pressure lines 25, 26 belonging to the profiles 10, 11 run in the profile 10 close to the ground approximately in the second third of the profile section 22, in the terminal profile section 23 approximately in the front third.
  • a similar version is shown in Fig. 5.
  • FIG. 7 shows a fin 9 which represents a practical embodiment of the fin shown in FIG. 6.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Body Structure For Vehicles (AREA)
  • Laminated Bodies (AREA)
  • Soil Working Implements (AREA)
EP83103834A 1982-04-23 1983-04-20 Fin for vessels Ceased EP0092785A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3215235 1982-04-23
DE3215235A DE3215235C2 (de) 1982-04-23 1982-04-23 Finne für Wasserfahrzeuge

Publications (2)

Publication Number Publication Date
EP0092785A2 true EP0092785A2 (fr) 1983-11-02
EP0092785A3 EP0092785A3 (en) 1984-11-28

Family

ID=6161786

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83103834A Ceased EP0092785A3 (en) 1982-04-23 1983-04-20 Fin for vessels

Country Status (2)

Country Link
EP (1) EP0092785A3 (fr)
DE (1) DE3215235C2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2680494A1 (fr) * 1991-08-19 1993-02-26 F2 Int Gmbh Aileron pour planche a voile.
US7244157B2 (en) * 2005-10-25 2007-07-17 Douglas James Simpson High-lift, low drag fin for surfboard and other watercraft

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3442921A1 (de) * 1984-11-24 1986-06-05 Gerd-Peter 2242 Büsum Ferring Finne fuer schnelle wasserfahrzeuge wie insbesondere surfbretter
DE8810058U1 (de) * 1988-08-06 1988-10-13 North Sails Windsurfing GmbH, 8122 Penzberg Vorrichtung zur Richtungsstabilisierung eines schnellen Wasserfahrzeugs

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3817202A (en) * 1973-07-05 1974-06-18 Outboard Marine Corp Anti-ventilation fence for a trim tab
US4089286A (en) * 1976-03-04 1978-05-16 Jeanne Greaves Hall Sheel Sailboat keel
US4044416A (en) * 1976-06-14 1977-08-30 Brewer Charles A Surfboard with adjustable fin
DE2826117A1 (de) * 1978-06-14 1979-12-20 Hannes Marker Finne fuer segelbretter
US4320546A (en) * 1979-07-23 1982-03-23 Knox Carleton R Surfboard
DE3141941A1 (de) * 1981-10-22 1983-05-05 Herbert 8000 München Schultes Finne fuer ein surfbrett

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US7244157B2 (en) * 2005-10-25 2007-07-17 Douglas James Simpson High-lift, low drag fin for surfboard and other watercraft
WO2007050473A3 (fr) * 2005-10-25 2008-12-11 Douglas James Simpson Derive a forte portance et faible trainee destinee a des planches de surf et a d'autres vehicules marins

Also Published As

Publication number Publication date
EP0092785A3 (en) 1984-11-28
DE3215235A1 (de) 1983-11-03
DE3215235C2 (de) 1984-12-06

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Legal Events

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

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AK Designated contracting states

Designated state(s): AT CH FR GB IT LI NL SE

PUAL Search report despatched

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Effective date: 19850525

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Effective date: 19860129

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: MISTRAL WINDSURFING AG

RIN1 Information on inventor provided before grant (corrected)

Inventor name: REITER, ALBERT

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: REITER, ALBERT

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Inventor name: REITER, ALBERT

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Effective date: 19881124