Patent ID: 8191351

Claim:
A solid fuel rocket motor, comprising: a solid fuel grain; a primary igniter; and a secondary igniter embedded in an end surface of the solid fuel grain; wherein the solid fuel grain adapted to 1) burn outwardly from a center surface facing a center perforation when ignited by the primary igniter, and 2) burn longitudinally from the end face when ignited by the secondary igniter; wherein the secondary igniter ignites the end face of the solid fuel grain when the temperature of the secondary igniter exceeds a predetermined ignition temperature; wherein the rocket motor further comprises an inhibitor layer to inhibit ignition of the center surface of the solid fuel grain when the grain is ignited by the secondary igniter; wherein the solid fuel rocket motor produces a first level of thrust when ignited by the primary igniter; and wherein the solid fuel rocket motor produces a second level of thrust substantially lower than the first level of thrust when ignited by the secondary igniter.