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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 22
N.A.CA. Technical Memorandum No.561 Figs»5 & 6 … Fig. 6 Characteristic curves,ka ,kp=f ( £5 ) ,for a family of propellers with profile II. 1,constants— j2 blades.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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