Fin assembly

Abstract

A fin assembly is adapted for rear mounting on a projectile. The assembly s a body with a longitudinal axis and a front adapted for mounting to the projectile. A plurality of angularly spaced fins are pivotally mounted on the body for rotating outwardly from an axial to an extended position. Each of these fins has a pivot point and a center of gravity. The center of gravity for each fin in the axial position is spaced radially inward from the pivot point. Slots formed within the projectile body aid in retaining the fins in their axial position.

What is claimed is: 
     
       1. In a fin assembly adapted for rear mounting on a projectile, said fin assembly comprising a body having a fin hub, which said body has a longitudinal axis and a front adapted for mounting to the projectile and a plurality of angularly spaced fins pivotally mounted on said body for rotating outwardly form an axial to an extended position, each of said fins having a pivot point and a center of gravity, the center gravity for each fin in the axial position being spaced radially inward from said pivot point, said body adapted to at least partially receive and retain each of said fins when in said axial position.   
     
     
       2. A fin assembly according to claim 1 wherein said body includes: an axisymmetric midsection with said fin hub having a flared front section.   
     
     
       3. A fin assembly according to claim 1, wherein said fin hub has a generally cylindrical midsection.