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FR2941672A1 - Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat - Google Patents

Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat Download PDF

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Publication number
FR2941672A1
FR2941672A1 FR0900490A FR0900490A FR2941672A1 FR 2941672 A1 FR2941672 A1 FR 2941672A1 FR 0900490 A FR0900490 A FR 0900490A FR 0900490 A FR0900490 A FR 0900490A FR 2941672 A1 FR2941672 A1 FR 2941672A1
Authority
FR
France
Prior art keywords
centerboards
leading edge
drift
boat
respect
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Withdrawn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
FR0900490A
Other languages
French (fr)
Inventor
Louis Routou
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
Priority to FR0900490A priority Critical patent/FR2941672A1/en
Publication of FR2941672A1 publication Critical patent/FR2941672A1/en
Withdrawn legal-status Critical Current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 
    • B63B3/00—Hulls characterised by their structure or component parts
    • B63B3/14—Hull parts
    • B63B3/38—Keels

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

Abstract

The device has a set of centerboards with a round leading edge (2), and a hollow cut off rib (4) placed on an interior side of the centerboards with respect to a boat. The cut off rib is located from an outer side of the centerboards by departing from the leading edge. Thickness of the cut off rib is equal to half of thickness of the centerboards. The cut off rib is arranged in parallel to the leading edge and extended toward a trailing edge. The centerboard is designed in a same proportion as that of a national advisory committee for aeronautic profile.

Description

- i- La présente invention concerne le profil d'un plan antidérive asymétrique pour voilier ou multicoque avec deux dérives. Avec le plan antidérive classique la chute de portance pour des angles d'incidence supérieurs à 12°, provoque sur le profil intrados un décrochement dû au décollement des filets d'eau. Des tourbillons apparaissent, leurs existences sont nuisibles et créent un gaspillage d'énergie dû à la traînée. Un sillage, une masse d'eau reste accrochée au bateau. The present invention relates to the profile of an asymmetric anti-drift plane for sailboats or multihulls with two fins. With the conventional anti-drift plane the lift drop for angles of incidence greater than 12 °, causes on the intrados profile a detachment due to the detachment of the nets of water. Whirlwinds appear, their existences are harmful and create a waste of energy due to the drag. A wake, a body of water remains attached to the boat.

Plan antidérive, selon l'invention, caractérisé en ce qu'un jeu de doubles dérives comportant chacune un décrochement, sur le coté intrados, à partir du deuxième tiers en partant du bord d'attaque et possèdent une épaisseur égale à la moitié de la dérive totale. Plan antidérive selon l'invention comporte un décrochement sur l'intrados du profil où se forme un tourbillon qui renvoie l'eau vers l'avant contre le décrochement, transformant une partie de la résistance due à la traînée en une force d'avancement. La zone tourbillonnaire provoquée par le décrochement agit comme une couche limite laminaire, ce qui réduit la traînée. Ce même décrochement résiste à un décrochage bien au-delà de 12°. Le redan se prolonge jusqu'au bord de fuite. Anti-drift plane, according to the invention, characterized in that a set of double fins each having a recess, on the intrados side, from the second third from the leading edge and have a thickness equal to half of the total drift. Anti-drift plane according to the invention comprises a recess on the intrados of the profile where a vortex is formed which returns the water forward against the recess, transforming a part of the resistance due to the drag into a forward force. The vortex zone caused by the strike acts as a laminar boundary layer, which reduces drag. This same detachment withstands a stall well beyond 12 °. The redan extends to the trailing edge.

Les dessins annexés illustrent l'invention : La figure 1 représente en coupe la dérive bâbord (tribord amure). La figure 2 représente en coupe la dérive tribord (bâbord amure). The accompanying drawings illustrate the invention: Figure 1 shows in section the port drift (starboard tack). Figure 2 shows in section the starboard drift (port tack).

En référence à ces dessins, les dérives sont basées sur le profil asymétrique avec des bords d'attaque arrondies (2) suivant ce même profil comme les bords extrados tribord et bâbord (1). La modification apportée à ce profil se trouve sur les bords intrados (3) des dérives tribord et bâbord où un redan, parallèle au bord d'attaque, a été creusé (4) permettant d'utiliser les traînées d'eau en une force de poussée. Ce redan, créant une zone tourbillonnaire qui agit comme une couche limite laminaire, réduit la traînée, augmente la portance et augmente le décroche bien au-delà de 12°. Les deux dérives se terminant sur un bord de fuite (5) classique. Les proportions de la dérive sont les mêmes que pour un profil NACA. With reference to these drawings, the fins are based on the asymmetric profile with rounded leading edges (2) following the same profile as the extrados and starboard port side (1). The modification made to this profile is located on the underside (3) of the starboard and port side fins where a redan, parallel to the leading edge, has been dug (4) allowing to use the water streaks in a force of thrust. This redan, creating a swirl zone that acts as a laminar boundary layer, reduces drag, increases lift and raises the stall well beyond 12 °. The two fins ending on a trailing edge (5) classic. The proportions of the drift are the same as for a NACA profile.

Claims (6)

REVENDICATIONS1) Plan antidérive, caractérisé en ce qu'il est constitué par un jeu de deux dérives et en ce que chaque dérive possède un bord d'attaque arrondi et un redan sur le coté intérieur de la dérive par rapport au bateau CLAIMS1) Anti-drift plane, characterized in that it consists of a set of two fins and in that each fin has a rounded leading edge and a step on the inner side of the fin with respect to the boat 2) Plan antidérive, selon la revendication 1, caractérisé par un redan se situant à partir du deuxième tiers de la dérive en partant du bord d'attaque. 2) anti-drift plane, according to claim 1, characterized by a redan lying from the second third of the drift from the leading edge. 3) Plan antidérive, selon la revendication 1, caractérise en ce que ce redan soit d'une épaisseur égale à la moitié de l'épaisseur de la dérive. 3) anti-drift plane, according to claim 1, characterized in that this redan is of a thickness equal to half the thickness of the drift. 4) Plan antidérive, selon la revendication 1, caractérise en ce que le redan soit parallèle au bord d'attaque. 4) anti-drift plane, according to claim 1, characterized in that the step is parallel to the leading edge. 5) Plan antidérive, selon la revendication 1, caractérisé en ce que le redan se prolonge jusqu'au bord de fuite. 5) anti-drift plane, according to claim 1, characterized in that the redan extends to the trailing edge. 6) Plan antidérive, selon l'une quelconque des revendications précédentes, caractérisé en ce que la dérive est dans les mêmes proportions qu'un profil NACA. 6) anti-drift plane, according to any one of the preceding claims, characterized in that the drift is in the same proportions as a NACA profile.
FR0900490A 2009-02-05 2009-02-05 Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat Withdrawn FR2941672A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR0900490A FR2941672A1 (en) 2009-02-05 2009-02-05 Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR0900490A FR2941672A1 (en) 2009-02-05 2009-02-05 Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat

Publications (1)

Publication Number Publication Date
FR2941672A1 true FR2941672A1 (en) 2010-08-06

Family

ID=41066153

Family Applications (1)

Application Number Title Priority Date Filing Date
FR0900490A Withdrawn FR2941672A1 (en) 2009-02-05 2009-02-05 Asymmetric anti-drift device for e.g. sailing ship, has set of centerboards with round leading edge, and hollow cut off rib placed on interior side of centerboards with respect to boat

Country Status (1)

Country Link
FR (1) FR2941672A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2416158A1 (en) * 1978-01-31 1979-08-31 Calcul Nautique Small boat hull fitted with bilge keels - and central keel at stern allowing vessel to rest upright when grounded
FR2600725A1 (en) * 1986-06-26 1987-12-31 Fertis Demeter Lifting wing surface
WO1999057007A1 (en) * 1998-05-06 1999-11-11 Elms Australia Pty. Ltd. Improved hydrofoil device
US20040104309A1 (en) * 2002-06-21 2004-06-03 Darko Segota Method and system for regulating external fluid flow over an object's surface, and particularly a wing and diffuser

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2416158A1 (en) * 1978-01-31 1979-08-31 Calcul Nautique Small boat hull fitted with bilge keels - and central keel at stern allowing vessel to rest upright when grounded
FR2600725A1 (en) * 1986-06-26 1987-12-31 Fertis Demeter Lifting wing surface
WO1999057007A1 (en) * 1998-05-06 1999-11-11 Elms Australia Pty. Ltd. Improved hydrofoil device
US20040104309A1 (en) * 2002-06-21 2004-06-03 Darko Segota Method and system for regulating external fluid flow over an object's surface, and particularly a wing and diffuser

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Effective date: 20141031