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set by the engine's thermodynamic cycle. In an open gas-generator cycle, a small fraction of the propellants is burned and the turbine exhaust is dumped overboard, giving a mechanically simple but slightly less efficient powerhead. In a staged combustion cycle the preburner gas is routed into the main chamber instead, raising performance but demanding higher pressures, more demanding seals and more careful materials selection. In a full-flow staged combustion cycle

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