Accession Number:

AD0606059

Title:

THEORETICAL AERODYNAMICS OF FLEXIBLE WINGS AT LOW SPEEDS. III, APPROXIMATE RESULTS FOR WINGS OF LARGE ASPECT RATIO,

Descriptive Note:

Corporate Author:

ITEK CORP PALO ALTO CALIF VIDYA DIV

Personal Author(s):

Report Date:

1964-07-01

Pagination or Media Count:

9.0

Abstract:

On the basis of strip theory neglecting induced downwash, an analysis has been made to obtain the geometric and aerodynamic characteristics of a number of flexible wings. The wings have leading edges which lie in a plane and utilize a trailing-edge cable which can have curvatures in both horizontal and vertical planes. Analytical solutions have been found for wings with leading edges of different shape which satisfy both the equation of static equilibrium for the trailing-edge cable as well as flexible air-foil theory for the strips. The wings are designed for a specific design angle of attack with a value of the chordwise tension parameter chosen to avoid camber flutter. A number of calculative cases are presented to show how the wing characteristics vary with three basic parameters used in the theory. An exploratory attempt to include induced downwash in the calculations using Prandtl swept lifting line was not successful because of singularities in the induced downwash. A combination of the Weissinger and Prandtl methods was partially succesful but of limited accuracy. Further work is desirable to improve the accuracy before publishing the method. Further work is also required to investigate off-design characteristics. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE