Projectile with reduced base drag.

摘要

A projectile having a downstream extending surface of revolution (306) which terminates as a blunt base (304) 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 (306) in the vicinity of the trough, and intersects the blunt. base (304) 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 (304), thereby reducing base drag on the projectile.