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The dangerous flat spin and the factors affecting it (1931)
NASA Technical Reports Server (NTRS) · leaf 49
K.A.O.Aa Technical Memorancluin No,6 29 Figs.25,26 … Fig.26 Horizontal empennage with open spaces next to fuselage.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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