Eagle Engineering Lunar Lander 3D model

This reusable, single-stage crewed lunar lander was proposed by Eagle Engineering in the early 1990s, as part of a series of transportation architecture studies for NASA. It featured a main cabin sized for 6 astronauts, derived from a Space Station Freedom module, and a low-hung airlock module for easy EVA access to the lunar surface which also could dock directly to a pressurized rover. Use of hydrogen and oxygen propellants offered high performance and also allowed easy evolution towards in-situ resource utilization. A pair of small, expendable cargo pods next to the main cabin allowed relatively easy unloading of cargo via crane

The lander would have been staged from low Earth orbit. An orbital transfer vehicle would boost it to translunar injection. The lander would then land on the moon, return to orbit, and dock with an aerobraking heat shield which it would use to aerocapture back into LEO for astronaut unloading and reuse

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