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The Torsional and Bending Deflection of Full-Scale Duralumin Propeller Blades under Normal Operating Conditions, Special Report (1938)
NASA Technical Reports Server (NTRS) · leaf 14
Figs.1,3 H.A.O.A.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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