Single chamber rap having centerport inhibitor

Claim 1

A rocket assisted projectile having in combination: (a) a projectile casing; (b) a solid propellant charge within the projectile casing extending substantially throughout the length of the casing and having an inhibited centerport therein which axially extends substantially throughout the length of the propellant charge; (c) said propellant charge being a cast single explosive sensitized charge selected from the group consisting of double base propellants, composite-modified double base propellants and cross-linked propellants in which high explosive is present in an amount of from about 60 to 80 weight percent, and said charge having bifunctional characteristics to produce rocket thrust for the projectile in flight and high explosive blast of the projectile at target; (d) said propellant charge being chemically bonded to an inhibitor adjacent the casing inner wall and also to the inhibitor of the inhibited centerport by a chemical bonding system at each chemically bonded surface; (e) said chemical bonding system at each said propellant surface being a two-layer composite including as a first layer an inhibitor material selected from the group of neoprene and a vinyl chloride-vinyl acetate/triphenylmethane triisocyanate formulation, and as a second layer a polyvinylformal together with a cross-linking agent therefor bonded both to said propellant and to said first layer; and (f) said inhibitor layer adjacent the inner casing wall bonded to said inner casing wall.