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
Likewise for the fin and rudder, the increase in axial velocity will have the effect of modifying the angle of attack and the rate of change of this angle, with corresponding results on its effect in connection with maneuvers and flight stability. Then we must further include the rotary component of the velocity in the propeller wake. It is' clear that this will have the direct effect of modifying the angle of attack for the entire system of tail surfaces from the value which it would have under flow without rotation.
As we have already seen, the action of the lifting system, significant for present purposes, is the production of lift through the combination of velocity and circulation, the latter for a given lift varying inversely as the speed. 1 See Division L VI. Aerodynamic Theory VI 2 P. i, the entire picture of the flow of air over the plane. In addition to this general effect due to downwash, the direction of flow of the air leaving the following edge of the plane will be further modified in some degree, and we thus find the control system, working in a flow of air with generally a definite downward component as compared with the direction of airflow at a great distance.
S. A. Technical Report No. 342, 1930. MILLIKAN, C. , and KLEIN, A. , The Effect of Turbulence, Aircraft Engineering, August 1933. RELF, E. : Results From the Compressed Air Tunnel, The Journal of the Royal Aeronautical Society, January 1935. See also Division G 19. 16 P. AIRPLANE AS A WHOLE part of the wings lying within the wake, comprising an increase of both lift and drag, and the production of a rolling moment. The first of these is due primarily to the increasc in axial velocity while the latter is due to the component of rotation which characterizes the motion of the air in the wake.
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.)