A - Human Necessities – 63 – B
Patent
A - Human Necessities
63
B
A63B 31/08 (2006.01) A63B 31/11 (2006.01) B63H 1/36 (2006.01) B63B 1/24 (2006.01) B63H 1/26 (2006.01) B63H 16/04 (2006.01) B63H 25/38 (2006.01)
Patent
CA 2240851
Methods are disclosed for increasing lift and decreasing drag on hydrofoils and swim fins. The methods include providing a hydrofoil (104) with a highly swept back leading edge portion (108) and orienting the hydrofoil (104) at a significantly reduced angle of attack in which the reduced angle of attack occurs at an angle that is substantially transverse to the hydrofoil's direction of movement through a surrounding fluid medium. Methods are disclosed for providing a hydrofoil with a substantially longitudinal recess or venting system located substantially along the center axis of the hydrofoil. The attacking surfaces of such hydrofoil are provided with an anhedral contour that forms a substantially lengthwise channel with the recess or venting system located along the center axis of this lengthwise channel. The central recess or venting system also permits the water flowing in an attached manner along the lee surfaces of the hydrofoil to merge with the water flowing from the attacking surfaces through the recess or venting system so that lift is efficiently generated.
L'invention porte sur des procédés accroissant la portée et réduisant la traînée d'ailes hydrodynamiques et de palmes de natation. Ces procédés consistent à donner à la zone (108) du bord d'attaque de l'aile hydrodynamique (104) une forme en flèche très fermée et à orienter ladite aile (104) en un angle d'attaque notablement réduit correspondant à un angle sensiblement perpendiculaire au sens du déplacement de la palme dans le milieu fluide environnant. L'invention porte également sur des procédés consistant à pratiquer dans la palme un évidement ou un système de ventilation longitudinal sensiblement centré. Les surfaces d'attaque de ladite palme présentent un contour en dièdre négatif formant avec l'évidement ou le système de ventilation un canal sensiblement centré sur l'axe longitudinal. L'évidement ou le système de ventilation permettent par ailleurs à l'eau s'écoulant sur les surfaces arrière de la palme de se mélanger dans l'évidement ou le système de ventilation avec celle provenant des surfaces d'attaque, ce qui permet de produire la poussée avec un haut rendement.
Mccarthy Peter Thomas
Smart & Biggar
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