Projectile with reduced base drag

Details Projectile with reduced base drag Projectile with reduced base drag

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.

REFERENCES:
patent: 871825 (1907-11-01), Schupmann
patent: 2074201 (1937-03-01), Bechereau
patent: 3072368 (1963-01-01), Seddon et al.
patent: 3434425 (1969-03-01), Critcher
patent: 3481531 (1969-12-01), MacArthur et al.
patent: 3588005 (1971-06-01), Rethorst
patent: 3635308 (1972-01-01), Millman
patent: 3776363 (1973-12-01), Kuethe
patent: 3873048 (1975-03-01), Platou
patent: 3919840 (1975-11-01), Markowski
patent: 4318669 (1982-03-01), Wennerstrom
patent: 4343506 (1982-08-01), Saltzman
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.

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