| The Lunar Lander and the Propellant Transporter are the two LTS spacecraft that are rocket powered. The specific impulse of the engine has a significant affect on the performance of the system and a value of 440 sec. has been assumed in our computations. An engine that meets those requirements is a version of the Pratt & Whitney RL-10. To fit the size limitations of the fairing of the Delta II Heavy rocket, the rocket engine may have to be modified to fit into the 0.9-meter space available in LTS spacecraft. Throttlability: To compensate for rocket shutdown transience, a small amount of thrust modulation will be required.
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Lunar Landers and Propellant Transporters use Lox/Hydrogen rocket engines.
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