Reduced aerodynamic drag baseball bat

Details Reduced aerodynamic drag baseball bat Reduced aerodynamic drag baseball bat

1992-09-23

1994-02-08

Graham, Mark S.

Amusement devices: games

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

Target

273 72A, A63B 5906

Patent

active

052843327

ABSTRACT:
The invention is a baseball bat having a handle portion and an end portion, the end portion having a generally cylindrical surface, and a striking portion, the surface of the striking portion impressed with a plurality of shallow depressions. The depressions are sized and located so as to increase the turbulence of the boundary layer of air flowing over the bat, as compared to the turbulence that would arise under identical conditions due to flow of air over a substantially smooth surfaced control bat, so as to trip the boundary layer and reduce the drag coefficient experienced by the bat, as compared to the drag coefficient that would be experienced by said control bat. Suggested parameters for optimization of the dimple sizes are provided.

REFERENCES:
patent: 771247 (1904-10-01), Hillerich
patent: 1530427 (1925-03-01), Simon
patent: 2169774 (1939-08-01), Taylor
patent: 4763900 (1988-08-01), Carr
Robert K. Adair, The Physics of Baseball, Harper & Row, New York, N.Y., pp. 78-106 (1990).
R. W. Fox and A. T. McDonald, Introduction to Fluid Mechanics, pp. 37-44, John Wiley & Sons, Inc., N.Y., N.Y. (1973).

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