Published online by Cambridge University Press: 24 August 2017
1 The negative speeds of advance corresponding to various rates of fall or movement; either without, i.e., “free engine,” or with only inadequate engine powder.
2 The paper also summarises tests taken on propellers of eleven blade sections and twelve blade outlines, and having 2, 3, 4, 6 and 8 blades. It also gives a systematic method of solving problems which involve variables which are connected by empirical relations.
3 I.N.A., p. 288 (1917).
4 Appendix I. of this paper, which deals with the helicopter problem, will be found reprinted in the Proc. of the Aer. Soc., Vol. XXVIJ. (1925), p. 337-341.