Buoys – rafts – and aquatic devices – Swimming aid to increase stroke efficiency – Foot attached
Patent
1996-01-11
1998-05-05
Sotelo, Jesus D.
Buoys, rafts, and aquatic devices
Swimming aid to increase stroke efficiency
Foot attached
A63B 3108
Patent
active
057466319
ABSTRACT:
Methods are disclosed for increasing lift and decreasing drag on hydrofoils and swim fins. These methods include providing a hydrofoil with a highly swept back leading edge portion and orienting the hydrofoil 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. The lee surfaces of the hydrofoil are provided with a substantially unobstructed flow path as well as a separation reducing contour so as to permit lift generating attached flow conditions to form along such lee surfaces. Substantially rigid structural reinforcement is provided to prevent the hydrofoil from deforming significantly during use. 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 a hydrofoil are provided with an anhedral contour that forms a substantially lengthwise channel with the recess or venting means located along the center axis of this lengthwise channel. Methods are disclosed for applying these lift generating and drag reducing methods to both non-flexible and flexible hydrofoil blades that are used in reciprocating propulsion strokes through a fluid medium. Also provided are methods for significantly controlling and reducing the build up of torsional stress forces within a flexible hydrofoil as it is encouraged to twist to a reduced angle of attack during use.
REFERENCES:
patent: 169396 (1875-11-01), Ahlstrom
patent: 783012 (1905-02-01), Biedermann et al.
patent: 871059 (1907-11-01), Douse
patent: 1324722 (1919-12-01), Bergin
patent: 1445538 (1923-11-01), Harsen
patent: 2241305 (1941-05-01), Hill
patent: 2950487 (1960-08-01), Woods
patent: 3084355 (1963-04-01), Ciccottelli
patent: 3086492 (1963-04-01), Holley
patent: 3411165 (1968-11-01), Murdoch
patent: 3422470 (1969-01-01), Mares
patent: 3453981 (1969-07-01), Gause
patent: 3773011 (1973-11-01), Gronier
patent: 3922741 (1975-12-01), Semeia
patent: 3934290 (1976-01-01), Le Vasseu
patent: 4007506 (1977-02-01), Rasmussen
patent: 4025977 (1977-05-01), Cronin
patent: 4083071 (1978-04-01), Forjot
patent: 4193371 (1980-03-01), Baulard-Caugan
patent: 4521220 (1985-06-01), Schoofs
patent: 4541810 (1985-09-01), Wenzel
patent: 4738645 (1988-04-01), Garofalo
patent: 4781637 (1988-11-01), Caires
patent: 4820218 (1989-04-01), Van de Pol
patent: 4857024 (1989-08-01), Evans
patent: 4934971 (1990-06-01), Picken
patent: 4940437 (1990-07-01), Piatt
patent: 4944703 (1990-07-01), Mosier
patent: 4954112 (1990-09-01), Negrini et al.
patent: 5163859 (1992-11-01), Beltrani et al.
patent: 5304081 (1994-04-01), Takizawa
patent: 5324219 (1994-06-01), Beltrani et al.
patent: 5358439 (1994-10-01), Paola
patent: 5435764 (1995-07-01), Testa et al.
"33202 of 1880" (Picture From Book-Found in US PTO) (115/28).
"Test Dive" Article in Jan./Feb. 1996 Issue of Sport Diver Magazine.
"Oceanic V-Drive Fins" in May/Jun. 1996 Issue of Sport Diver Magazine.
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