Aeronautics and astronautics – Aircraft structure – Details
Patent
1986-12-29
1989-03-21
Barefoot, Galen
Aeronautics and astronautics
Aircraft structure
Details
244 31, 244199, 244200, 102501, B64C 2306
Patent
active
048136352
ABSTRACT:
A projectile having a downstream extending surface of revolution which terminates as a blunt base has a plurality of circumferentially spaced apart U-shaped, downstream extending troughs in its surface. Each trough is essentially aligned with the direction of the bulk fluid flow adjacent the surface in the vicinity of the trough, and intersects the blunt base to form a trough outlet therein. The troughs are appropriately spaced apart, sized and configured to flow full over their entire length and to cause fluid to flow into the space immediately behind the blunt base, thereby reducing base drag on the projectile.
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patent: 4318669 (1982-03-01), Wennerstrom
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patent: 4455045 (1984-06-01), Wheeler
"Axisymmetric Bluff Body Drag Reduction Through Geometrical Modification", by Howard and Doodman, Journal of Aircraft, vol. 22, #6.
"Longitudinal Grooves for Bluff Body Drag Reduction", by Howard, Quass, Weinstein and Bushnell, AIAA Technical Note 81-4095, vol. 19, No. 4, Apr. 1981.
Paterson Robert W.
Presz, Jr. Walter M.
Werle Michael J.
Barefoot Galen
Revis Stephen E.
United Technologies Corporation
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