Appraisal of Method of Flutter Analysis Based on Chosen Modes by Comparison with Experiment for Cases of Large Mass Coupling
Appraisal of Method of Flutter Analysis Based on Chosen Modes by Comparison with Experiment for Cases of Large Mass Coupling

Author: Donald S. Woolston

Publisher:

Published: 1949

Total Pages: 22

ISBN-13:

DOWNLOAD EBOOK

Results are presented for a series of flutter studies in which a Rayleigh type analysis based on chosen modes is applied to a uniform model wing carrying an arbitrarily placed concentrated weight in order to appraise the accuracy of the assumption of uncoupled modes of vibration. The results are compared with experiment.

Aerodynamic Properties of Cruciform-wing and Body Combinations at Subsonic, Transonic, and Supersonic Speeds
Aerodynamic Properties of Cruciform-wing and Body Combinations at Subsonic, Transonic, and Supersonic Speeds

Author: John R. Spreiter

Publisher:

Published: 1949

Total Pages: 646

ISBN-13:

DOWNLOAD EBOOK

The aerodynamic forces and moments exerted on pitched and yawed wing-body combinations consisting of a slender body of revolution and a cruciform arrangement of thin wings have been investigated by two theoretical methods. One method, an extension of the slender wing-body theory of NACA TN No. 1662, makes possible the determination of simple closed expressions for the load distribution, of simple closed expressions for the load distribution, the forces, and the moments for slender cruciform-wing and body combinations in which the wings may be dissimilar plan form. The second method treats cruciform-wing and body combinations consisting of a body of revolution and identical wings of arbitrary aspect ratio and plan form. The results are valid at subsonic, transonic, and supersonic speeds.