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Analysis of flight and wind-tunnel tests on Udet airplanes with reference to spinning characteristics (1929)
NASA Technical Reports Server (NTRS) · leaf 31
N.A.C.A. Technical Memorandum llo.502 (Crnt. cf Fig,13) (Continuation of Fig.13.)NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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