Patent ID: 11884408
Assignee: GOODRICH CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC B  F | IPC B  F

Claim 0:
1. A solid propellant propulsion motor for an ejection catapult assembly, comprising:
a motor case configured to be coupled to the ejection catapult assembly;
a forward propellant grain extending along a longitudinal axis of the motor case between a forward end of the motor case and a first burn inhibitor layer in the motor case;
the first burn inhibitor layer disposed axially adjacent to the forward propellant grain;
an aft propellant grain disposed axially adjacent to the first burn inhibitor layer;
a second burn inhibitor layer disposed axially adjacent to an aft end of the aft propellant grain; and
an ablative material layer disposed on a radially inner surface of the aft propellant grain, wherein during operation of the solid propellant propulsion motor, the solid propellant propulsion motor includes:
a first phase of combustion of the forward propellant grain, and
a second phase of combustion of the aft propellant grain, the first phase of combustion having a higher pressure burn and a shorter duration relative to the second phase of combustion.