Copy typewritten letter from Frederick Lanchester to F.M. Green

Scope and Content

Lanchester refers to different figures of airscrew efficiency obtained in his theoretical solution given in his paper “The Screw Propeller” (Proceedings of the Institution of Automobile Engineers, Vol 9. pp 263 – 324). Lanchester refers to “figure 23 facing page 142” [in the printed volume figure 23 faces page 310].