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The indicial lift and pitching-moment coefficients are derived for flat-plate triangular wings at supersonic speeds. Coefficients are determined for angle-of-attack distributions corresponding to sinking and pitching wings. The wing with supersonic edges is completely analyzed, the wing with subsonic edges is partially analyzed; the solution in this case being completed for very narrow wings by an application of slender wing theory. In case of the supersonic edges, a comparison is made with known two-dimensional results and also with results for the same triangular wing in reversed flow.
The problem of the build-up of lift on two- and three-dimensional wings flying at high speeds is discussed as a boundary-value problem for the classical wave equation. Kirchhoff's formula is applied so that the analysis is reduced, Just as in the steady state, to an investigation of sources' and doublets. Some simple applications of this method are considered, including the determination of the starting lift of a three- dimensional wing and the potential functions for some types of unsteady vortex motion.

Report

United States. National Advisory Committee for Aeronautics

Published: 1952

Total Pages: 78


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Highly regarded text deals with aeroelasticity as well as underlying aerodynamic and structural tools. Topics include incompressible flow, flutter, model theory, and much more. Over 300 illustrations. 1955 edition.
Includes the Committee's Technical reports no. 1-1058, reprinted in v. 1-37.