초록 ▼

A propellant grain for a cylindrical casing has a cavity including an axially central opening with a combustion product exit port at one end. The grain bears a plurality of surfaces extending circumferentially about and disposed normally or helically to this opening so as to define, between these su

A propellant grain for a cylindrical casing has a cavity including an axially central opening with a combustion product exit port at one end. The grain bears a plurality of surfaces extending circumferentially about and disposed normally or helically to this opening so as to define, between these surfaces and axially of the casing, alternating sections of propellant and sections of a groove or grooves in the propellant. The groove sections extend radially from the opening to a distance selectable to provide the grain with a large initial surface area while providing a high propellant volume.

대표청구항 ▼

1. A grain of solid propellant comprising:a plurality of first surface sections defining a cavity in the grain, said first surface sections being disposed on a surface of revolution having an axis; a plurality of second surface sections further defining said cavity, said second surface sections exte

1. A grain of solid propellant comprising:a plurality of first surface sections defining a cavity in the grain, said first surface sections being disposed on a surface of revolution having an axis; a plurality of second surface sections further defining said cavity, said second surface sections extending radially from the surface of revolution and being spaced along said axis so that said second surface sections define a groove extending generally circumferentially of said surface of revolution and define a plurality of segments of propellant disposed oppositely of said groove in a direction along said axis; and, a gap, containing propellant, between said second surface sections and a periphery of the grain wherein said gap promotes a neutral bum of said propellant.