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Improving the Performance of Multi-engined Airplanes by Means of Idling Propellers : the "free-wheel" Propeller (1930)
NASA Technical Reports Server (NTRS) · leaf 21
Fig.4 N.A.C.A. Technical Memorandum TTo.561 … Fig.4 Characteristic curves,p, cL,p=f( nD ),for a family of propellers with profileII* L, constant^ ;2 "blades.NASA Technical Reports Server (NTRS)
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