By W. F. Durand (auth.), William Frederick Durand (eds.)
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Extra info for Aerodynamic Theory: A General Review of Progress Under a Grant of the Guggenheim Fund for the Promotion of Aeronautics
The amount of such loss will obviously depend on many circumstances, but again for the conditions of the reference, the indicated values of the loss ranged from 2 to 5 per cent for normal operative values of v/nD. The typical combination assumed for the preceding discussion has been taken as a propeller and a fuselage. Evidently the same general principles apply and the same general results will follow for the combination of a propeller and an engine nacelle in the case of multi-engined planes, or for any similar combination of a propeller with an obstruction placed near and in its direct wake.
Put in these terms, it is clear that such influence must be small or negligible. The elevator and rudder are located at the tail end of the fuselage and the ailerons are on the wings usually far removed from the central body of the plane. Remembering then that the aerodynamic result of the fuselage, or of the nonlifting system generally, is the development of drag, it seems clear that the elements of the control system can have no sensible influence on the conditions which determine the amount of such drag and we may, therefore, dismiss this part of the subject without further consideration.
In general, therefore, the tail control surfaces must be so set for what may be called their zero position, as to take due account of these changes in the direction of airflow. In addition to this change of direction, the presence of the wing will further induce some degree of turbulence in the air leaving it and meeting the tail surfaces. This effect will, therefore, conjoin with that due to the same general cause resulting from the presence of the fuselage and the action of the propeller, as referred to later in 9 and 11.
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.)