THE PERFORMANCE OF PROPELLERS OPERATING AT ZERO ADVANCE RATIO.

The thesis is concerned with methods of predicting the performance, that is, the overall thrust and power, of air propellers operating at zero advance ratio. Measurements from two such propellers, often called static thrust propellers because they are designed to operate at zero forward speed, are used as a basis for evaluating the following performance prediction methods the modified Lock - Goldstein method, and the Gartshore - Gray method. Both prediction methods give fairly good estimates of overall thrust. The former method gives a poor radial distribution of thrust while that of the latter method is relatively good. Conventional strip analysis is also evaluated using measured inflow velocities and while agreement between theory and experiment can be excellent it is conditional upon the assumptions made with respect to blade section characteristics and the use of tangential inflow velocity. Author