Football with fins

Details Football with fins Football with fins

1992-06-18

1993-12-14

Marlo, George J.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273 65EF, 273 65EG, 273DIG20, 273 58K, A63B 4302

Patent

active

052695140

ABSTRACT:
A ball of prolate (football-shaped) configuration having external fins oriented at an angle relative to the longitudinal axis to promote rotation in flight and having leading and trailing edges positioned such that the net center of aerodynamic lift of said fins is located rearwardly of the ball's longitudinal midpoint.

REFERENCES:
patent: Re33449 (1990-11-01), Martin
patent: D322105 (1991-12-01), Ma
patent: 3225488 (1965-12-01), Goldfarb
patent: 3256020 (1966-06-01), Smith
patent: 3604352 (1971-09-01), Bench
patent: 4736948 (1988-04-01), Thomas
patent: 4772020 (1988-09-01), Martin
patent: 4887814 (1989-12-01), Winter
patent: 4919422 (1990-04-01), Ma
patent: 5133550 (1992-07-01), Handy
Shevell, Richard S., Fundamentals of Flight, 2d. ed., Prentice Hall, Inc., Englewood Cliffs, 1989, pp. 309, 312.
Schlichting et al., Aerodynamics of the Airplane, McGrall-Hill International Book Company, New York, 1979, pp. 137-166.
Clancy, L. J., Aerodynamics, Halsted Press, New York, 1975, pp. 489-490.

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