A few more mechanical-flight formulas without the aid of polar diagrams (1928)
NASA Technical Reports Server (NTRS) · leaf 30
30 N.A.C.A. Technical Memorandum No .457 Figs.7 & 8 … Fig.8 Inverse values of the L/D ratios of various air- planes plotted against their best gliding speeds.
NASA Technical Reports Server (NTRS) · Legacy CDMS · Schrenk
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
