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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 35
0 30 40 50 60 70 80 90 100 110 Velocity, miles per hour, Fig.l .Curves of power available and required, 500 pound light airplaneNASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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