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Contribution to the theory of propeller vibrations (1930)
NASA Technical Reports Server (NTRS) · leaf 25
N.A.C.A. Te clinical Memorandum No,568 Figs.4,5 … Fig.5 Arrangement of propellers on 3 engine airplane (from "Flugsport" 1927,p.489).NASA Technical Reports Server (NTRS)
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