Mixed fuel control system for a rocket motor

Claim 1

A CONTROL SYSTEM FOR A ROCKET MOTOR OF THE KIND HAVING IGNITER EQUIPMENT AND COMBUSTION EQUIPMENT FOR A MIXTURE OF LIQUID FUEL AND LIQUID OXIDIZER FORMING THE PROPELLENT, A RESERVOIR, PUMP AND VALVE MEANS FOR THE FUEL, CONDUITS CONNECTING THE RESERVOIR TO THE PUMP AND THE PUMP TO THE VALVE MEANS RESPECTIVELY, AND A RESERVOIR, PUMP AND VALVE MEANS FOR THE OXIDIZER, AND CONDUITS CONNECTING THE OXIDIZER RESERVOIR TO THE OXIDIZER PUMP AND THE LATTER TO THE OXIDIZER VALVE MEANS RESPECTIVELY, THE OXIDIZER PUMP BEING OF THE KIND WHICH WILL ALLOW A FLOW THROUGH IT WHEN IT IS NOT BEING OPERATED; INCLUDING AN ADDITIONAL VALVE INTERPOSED IN THE CONDUIT CONNECTING THE OXIDIZER RESERVOIR TO THE ASSOCIATED PUMP, THE OXIDIZER PUMP AND THE ASSOCIATED VALVE MEANS BEING ARRANGED AT A LEVEL TO BE SUPPLIED WITH OXIDIZER BY GRAVITY WHEN SAID ADDITIONAL VALVE IS OPEN IN ORDER TO COOL THESE PARTS TO A TEMPERATURE AT WHICH EVAPORATION CEASES, A CONDUIT EXTENDING FROM THE OXIDIZER VALVE MEANS TO THE ASSOCIATED RESERVOIR TO RETURN EVAPORATED OXIDIZER TO THE RESERVOIR AND, WHEN THE OXIDIZER PUMP IS RUNNING, TO INITIALLY RETURN ITS OUTPUT TO THE OXIDIZER RESERVOIR, MEANS RESPONSIVE TO THE PRESSURE OF THE OUTPUT OF THE OXIDIZER PUMP, A VALVE IN THE CONDUIT INTERCONNECTING THE FUEL RESERVOIR AND THE ASSOCIATED PUMP, AND DELAY MEANS FOR ACTUATING SAID LAST-MENTIONED VALVE FROM SAID PRESSURERESPONSIVE MEANS AFTER THE PRESSURE OF THE OUTPUT OF THE OXIDIZER PUMP REACHES A PREDETERMINED VALUE.