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A Gas-generator Cycle can also specifically refer to a way of designing a turbopump-fed Liquid Rocket engine, where some of the propellant is burned to drive the turbopump, and the exhaust is dumped overboard (usually through a Nozzle ) instead of being fed into the main Combustion Chamber . Many liquid rockets are designed this way, for example the Saturn V F-1 and SpaceX Merlin engines. Usually, the propellants are burned in a highly fuel-rich mix to keep flame temperatures low -- O:F ratios below 0.5 are common.

Another good example is the V-2 Rocket , which used Hydrogen Peroxide decomposed by a liquid Sodium Permanganate Catalyst solution as a gas generator. This was used to drive the main Turbopump to pressurize the LOX - Ethanol propellants.

A common gas generator is the Chemical Oxygen Generator .

Gas generators have also been used to power Torpedo es. Hydrogen Peroxide is frequently used in such applications.