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It varies widely with the chamber pressure and other details of the engine design. Some examples of first-stage engines with their approximate nozzle ratios: RD-180 (Atlas V) 36:1 F-1 (Saturn V) 16:1 Merlin 1D (Falcon 9) 16:1 SSME (STS, SLS) 77:1 For ideal performance, the expansion should reduce the exhaust pressure to be equal to the ambient atmospheric ...


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