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
On the other hand reference has been already made to the addition to the total drag which may be due to the elements of the control system when displaced from neutral position. While, therefore, they can have no sensible influence on the fuselage drag as such, they will, when in operative position, cause a definite addition to the drag as a whole. 1 See Division J III 13; also Division 0 VIII. SECTION 11 27 11. Influence of the Propulsive System on the Control System!. In I) and 9 reference was made to the influence of the wings and fuselage on the control surfaces by way of a disturbance to the airflow with generation of turbulence.
While, therefore, the effect of displaced ailerons is to produce a change in the lift, the effects on the two sides of the wing will be opposite in direction and will usually nearly balance, so that the effect on the lift as a whole is not usually of importance. SECTION 7 21 We reach, therefore, the general conclusion that so far as the lift as a whole is concerned, the influence of the control system, whether in neutral or displaced position, is small or negligible. However, it may not be out of place to note, with reference to the ailerons, that while their influence on the lift as a whole is small or negligible, the same is not the case with regard to the drag.
In free air, some turbulence may in general be expected; but the presence of the fuselage will increase this in degree and we may, therefore, expect that the control surfaces forming the empennage must normally be met by air with a relatively high degree of turbulence. The actual condition in this respect, will, furthermore, be due, not only to the presence of the fuselage, but also in still greater degree to the action of the propeller located at the nose of the fuselage. The actual condition at the empennage P.