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Thrust and power required in climbing (1923)
NASA Technical Reports Server (NTRS) · leaf 25
Figs. 16,17,18,19- … Fig. 16 Simplification of the r curve in the vicinity of r0. Fig. 19 Comparison with the climhing formula of Kann.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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