ROCKET MOTOR AND COMPONENTS THEREOF

A rocket motor and rocket motor feed system (100; 300; 400) are disclosed. The rocket motor feed (100; 300; 400) system includes a sonic choke (120; 200; 320; 420; 421) which passively regulates the mass flow rate of gaseous propellant passing through the sonic choke (120; 200; 320; 420; 421). An injector (125; 325; 425; 500) is provided and isolates the upstream feed line (110; 310; 410; 411) of the rocket motor feed system (100; 300; 400) from a combustor (130; 330; 430; 550). Regenerative cooling circuits (322; 422) are disclosed. Self-pressurised gaseous propellants may be used with the rocket motor and rocket motor feed system (100; 300; 400). Suitable propellants are disclosed. Bi-propellants may be used. The sonic choke (120; 200; 320; 420; 421) may provide a ratio of oxidiser:fuel to a combustor (130; 330; 430; 550). Rocket motor feed systems (100; 300; 400) with separate fuel and oxidiser branches are also disclosed. A rocket motor utilising such a feed system is disclosed.