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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 engine.

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 .