Patent ID: 8222583

Claim:
A water-entry projectile comprising: a body; one or more drag-stabilizing elements; one or more attachment members adapted to couple said one or more drag-stabilizing elements to said body via a corresponding curved base which conforms circumferentially to an outer surface of said body, and said drag-stabilizing elements being disposed about an aft end of said body; wherein said one or more attachment members are adapted to cause said one or more drag-stabilizing elements to detach from said projectile during air-borne flight prior to water entry; an impact sensitive element, said impact sensitive element connected to one or more of said one or more attachment members and extending over a portion of said aft end of said projectile; a delay element, said delay element connecting one or more of said one or more attachment members to said impact sensitive element; wherein said impact sensitive element is adapted to ignite said delay upon receipt of a kinetic impact; and a coil extending through a center of said projectile, said coil coated with a thermally reactive material.