SP-4221 The Space Shuttle
Decision
Fully-reusable shuttle concepts of
1969; R indicates the stage is reusable. 1: Triamese of General
Dynamics. 2: Two-stage arrangement with both stages thrusting at
launch. 3: Two stages, upper stage ignited at high altitude. 4:
Faget's concept. 5: Concept of NASA-Langley, with both stages as
lifting bodies. (NASA)
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