Accession Number : AD0889039

Title :   A Study of Folding Proprotor VTOL Aircraft Dynamics. Volume I. Analytical Methods.

Descriptive Note : Final rept. Feb 69-Feb 71,

Corporate Author : BELL HELICOPTER TEXTRON INC FORT WORTH TX

Personal Author(s) : Yen, Jing G. ; Weber, Gottfried E. ; Gaffey, Troy M.

Report Date : SEP 1971

Pagination or Media Count : 302

Abstract : The report describes the results of a study of the dynamic stability and response during the feathering and folding of the blades of a folding-proprotor VTOL. The study involved the development of analytical methods of predicting the dynamic characteristics during feathering and folding, correlation of the theoretical methods with experimental data, a dynamic analysis of a representative folding-proprotor VTOL design, and a parametric study to identify design factors which can be used to control dynamic characteristics during feathering and folding. Correlation of the theory with measured dynamic stability and response characteristics during feathering and folding is good, and indicates the analytical methods can be used with confidence. The results of the dynamic analysis indicate satisfactory stability and response characteristics can be achieved in a 66,000-pound gross-weight class, folding-proprotor VTOL. The results of the parametric study are summarized in terms of design guidelines. This volume contains the development of the theory, correlation of theory with experimental data, and the dynamic analysis and parametric study. (Author)

Descriptors :   (*CONVERTIBLE PLANES, AERODYNAMIC CHARACTERISTICS), ROTOR BLADES(ROTARY WINGS), STABILITY, FLUTTER, FREQUENCY, MATHEMATICAL ANALYSIS.

Subject Categories : V/STOL
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE