Patent ID: 11958790
Assignee: NEDERLANDSE ORGANISATIE VOOR TOEGEPAST-NATUURWETENSCHAPPELIJK ONDERZOEK TNO
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 5:
6. The propellant grain according to claim 1, said propellant grain having a prism or cylindrical shape and a concentric perforation passing through the grain in the length direction that provides the inner surface, wherein said inner layer has a symmetrical cross-sectional shape that comprises one or more vertices directed toward the outer surface, and wherein the grain has an A/B ratio of about equal to the ratio of the linear burn rate of the fast-burning propellant composition to the linear burn rate of the slow burning propellant composition, wherein A is defined as the part of a geometrical line that passes the inner layer and B is defined as the part of said geometrical line that passes the outer layer, wherein the geometrical line is a line extending from the center of the grain to the outer surface while being orthogonal on the contact surface, which is defined as the surface at which the outer and the inner layers meet.