PROPULSION ENGINE TYPES Which is the preferred type? It actually depends on the purpose of the rocket. As you have seen, the Space Shuttle uses both types at different times in its launch sequence. This approach permits the strengths of each to be used to the fullest. With each propellant type having its own advantages and disadvantages, both these chemical engines will continue to play unique and important roles in the nation’s space program. 28 of 39
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