Accession Number : AD0757257

Title :   The Numerical Solution and Analysis of Airplane Spin Equations Modeled in a Fixed Coordinate System.

Descriptive Note : Master's thesis,

Corporate Author : NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF

Personal Author(s) : Champoux,Robert Louis

Report Date : DEC 1972

Pagination or Media Count : 139

Abstract : Three forms of the airplane spin equations of motion, derived by Buehler form the basis for the development of a computer program designed to seek dynamically stable equilibrium solutions of a spinning aircraft. The program incorporates two solution techniques: one based upon Euler integration, the other, a version of minimization by gradient search. Secondary programs are developed to generate power off glide parameters for use in the validation of the equations of motion, and evaluate equation residuals obtained from a grid of initial conditions over the potential solution space. F-111 and F-4 aerodynamic force and moment models were utilized to evaluate the solution methods and equations of motion. The numerical results indicate that the F-111 and F-4 data are not representative of the actual aircraft and, therefore, it is highly unlikely that dynamically stable equilibrium solutions can be achieved from these models. (Author Modified Abstract)

Descriptors :   (*JET FIGHTERS, SPINNING(MOTION)), (*AERODYNAMIC LOADING, NUMERICAL ANALYSIS), MATHEMATICAL MODELS, COMPUTER PROGRAMS, FORCE(MECHANICS), EQUATIONS OF MOTION, PARTIAL DIFFERENTIAL EQUATIONS, NUMERICAL INTEGRATION, STABILITY, THESES

Subject Categories : Attack and Fighter Aircraft
      Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE