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The dangerous flat spin and the factors affecting it (1931)
NASA Technical Reports Server (NTRS) · leaf 41
N.A.C.A, Technical Memorandum No, 629 Fig. 5 … Fig. 5 Plat-spinning seaplane falling almost vertically at a midspan angle of attack of about 60°NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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