Sep 28 1977
From The Space Library
NASA reported that LeRC research under the Aircraft Energy Efficiency Program (ACES) might bring back the use of propellers, once considered obsolete, in fast commercial aircraft service. Advances in composite-material technology had led to design of small diameter 8-blade propellers that might save 20 to 40% in fuel over current turbofan engines. (MSFC Release 77-206)
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