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The light airplane : modern theoretical aerodynamics as applied to light airplane design with a series of charts (1925)
NASA Technical Reports Server (NTRS) · leaf 39
Ql 1 1 1 1 1 1 1 ! 10 15 20 25 30 35 40 45 Span loading. Fig.5 Time to 5000 ft. vs. span loading.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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