By W. F. Durand (auth.), William Frederick Durand (eds.)
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Extra resources for Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics
For any value of the wind velocity as based on the latter, the air column operative on the propeller will be slowed down, the thrust generally will be increased and the value of v/nD for zero thrust will be increased. S. A. Technical Report No. 220, 1926; P. AIRPLANE AS A WHOLE 24 of v/nD and, near the start must lie above that for the propeller alone (see Fig. 2). However, as the slip becomes greater with decreasing values of v/nD, the gain in net thrust decreases and ultimately the two curves meet and cross.
In studying the developments of the present Division, the reader will find it helpful to keep in mind these successive steps or stages, as guides or connecting links between the successive sections. 1. Introduction. The aerodynamic theory of airships deals with the loads imposed on the structural system of airships by the air forces, and with the problem of stability and the required fin areas. As a basic assumption the theory assumes the substitution of a perfect, nonviscous fluid for air, and for this reason fails to be of use for the computation of the performance, since solids moving in a perfect fluid experience no resistance.
B: As regards the fin and rudder: (8) By way of increased velocity in the propeller wake with general disturbance of flow, influence on angle of attack and increased turbulence, all due to the same general causes as for the horizontal surfaces. (9) By way of a lateral force or rolling moment due to the rotary component in the propeller wake, the same as for the horizontal surfaces. (10) Note should also be made of the possibility of a serious or even almost total loss of useful effect on the tail control surfaces in case they are operative in a "dead air" wake due either to the fuselage or an oversized propeller hub or some combination of the two.
Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics by W. F. Durand (auth.), William Frederick Durand (eds.)