Typewritten letter from Frederick Lanchester to Sir Richard Gregory

Scope and Content

This letter was returned by Gregory to Lanchester. Lanchester considers the author of the notice has missed the significance of the paper which he explains: i.e. theory and laboratory experiment had hitherto shown disagreements, and theory (as propounded in Lanchester’s “Aerial Flight”) had been under a cloud although recently it had been found to agree fairly well with full-scale results. “The paper made it clear that the theory was not at fault, but that it only applied with precision under the conditions of high Reynolds numbers …” Lanchester follows this general statement with more detailed summary of points made in the paper in support of this claim.