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Read e-book online Aerodynamic Theory: A General Review of Progress Under a PDF

By W. F. Durand (auth.), William Frederick Durand (eds.)

ISBN-10: 3642896278

ISBN-13: 9783642896279

ISBN-10: 3642914845

ISBN-13: 9783642914843

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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

Sample text

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.

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. AIRPLANE AS A WHOLE 26 is, therefore, due to these two agencies in combination, of which, however, at the present moment, we direct attention more especially to the part due to the fuselage. The result which we are now considering is, therefore, simply that of turbulent air flowing over the control surfaces as compared with air relatively free from turbulence.

Moreover, since airship design draws on the whole domain of aerodynamics and sincc special airship aerodynamics should contain as its most notable problem the full analysis of airship drag, it seems quite possible that from airship theory may some day come forward such fundamental progress in aerodynamics as shall revolutionize our technique of air travel. Airship design involves, as a spccial field, the investigation of air forces brought into existencc by the motion through the air of large, bulky, streamlined solids.

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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.)


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