The "Magnus effect" - the principle of the Flettner rotor (1925)
NASA Technical Reports Server (NTRS) · leaf 28
N.A.C.A. Techtiloal MemcraEduisi He. 310 Figs.9,10,11 & 12 … Fig. 12 Stream lineo aod mar- ginal layer in the casa of a rotating cylinder, from a photc by Prajidti.
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