Projectile with an extendable boattail

Details Projectile with an extendable boattail Projectile with an extendable boattail

1986-02-21

1987-06-23

Kyle, Deborah L.

Aeronautics and astronautics

Missile stabilization or trajectory control

Externally mounted stabilizing appendage

102489, F42B 13273

Patent

active

046747060

ABSTRACT:
A projectile having a streamline assembly which includes a frusto-conical saddle secured to the boattail area of the projectile bullet, a carrying cylinder having one end secured to the saddle, with multiple, concentrically oriented, tapered, collapsible rings normally located inside the opposite end of the carrying cylinder and biased against a pressure disk fitted against the opposite end of the carrying cylinder, wherein firing of the projectile causes the pressure disk to tear away from the carrying cylinder and deploy the collapsible rings outwardly of the carrying cylinder and behind the bullet in a "beehive" configuration, to reduce air resistance as the projectile moves through the atmosphere. In a preferred embodiment the pressure disk is pressed against the carrying cylinder by means of a brass screw, the threads of which engage an aperture in the saddle and are stripped from the brass screw to release the disk when the projectile is fired.

REFERENCES:
patent: 229499 (1880-06-01), Turner
patent: 399880 (1889-03-01), Graydon
patent: 2297130 (1942-09-01), Bomar
patent: 3282216 (1966-11-01), Calfee et al.
patent: 3412962 (1968-11-01), Killian

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