The Problem of Fatigue: A Further Comment on the Contributions of Mr J. Shapiro and Mr W. A. P. Fisher

To the Editor, Sir, It was interesting to read W. A. P. Fisher's reply to J. Shapiro on that most engaging of subjects—fatigue. Both may be warmly praised for the frankness with which they expressed their personal opinions. The course of the discussion, however, prompts yet another view‐point to be stated concerning fatigue of aircraft in general rather than fatigue of helicopters in particular.