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

Claim 8:
9. An ejection catapult assembly, comprising:
a mortar tube; and
a solid propellant propulsion motor configured to propel the mortar tube, the solid propellant propulsion motor comprising:
a motor case,
a forward propellant grain disposed at a forward end of the motor case,
an aft propellant grain disposed axially aft of the forward propellant grain and fluidly isolated from the forward propellant grain, and
an ablative material layer disposed on a radially inner surface of the aft propellant grain, the ablative material layer configured to erode during burning of the forward 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.