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Relative Economy of Different Methods of Airplane Construction (1931)
NASA Technical Reports Server (NTRS) · leaf 46
N.A.C.A. Technical Memo.No.618 Figs.5,6,7 … Pig.5 Sections of Fig.6 Sections of typical wood spars. typical metal spars. Fig.7 Simnonds "Spartan" "biplane.NASA Technical Reports Server (NTRS)
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