Author : Norman E. Gowin
Publisher :
Page : 30 pages
File Size : 31,55 MB
Release : 1959
Category : Least squares
ISBN :
Author : Ernest L. Black
Publisher :
Page : 204 pages
File Size : 19,75 MB
Release : 1969
Category : Aerodynamics
ISBN :
Author : Herman S. Fletcher
Publisher :
Page : 48 pages
File Size : 35,91 MB
Release : 1971
Category : Airplanes
ISBN :
Methods presented in five different publications have been used to estimate the low-speed stability derivatives of two unpowered airplane configurations. One configuration had unswept lifting surfaces, the other configuration was the D-558-II swept-wing research airplane. The results of the computations were compared with each other, with existing wind-tunnel data, and with flight-test data for the D-558-II configuration to assess the relative merits of the methods for estimating derivatives. The results of the study indicated that, in general, for low subsonic speeds, no one text appeared consistently better for estimating all derivatives.
Author : Albert E. Brown
Publisher :
Page : 52 pages
File Size : 44,84 MB
Release : 1959
Category : Aerodynamics
ISBN :
Author : Paul W. Kirster
Publisher :
Page : 86 pages
File Size : 25,4 MB
Release : 1974
Category :
ISBN :
Two methods for extracting stability derivatives from flight data are compared. A modified Newton-Raphson minimization technique and a digital-analog (hybrid) matching technique were used to analyze the same data maneuvers obtained from two aircraft. About 55 maneuvers of an F-111E aircraft were analyzed over a Mach number range of 0.3 to 2.0 and an angle of attack range of 3 to 19 degrees. About 15 maneuvers were analyzed for the X-24A lifting body at Mach numbers of 0.8 and 0.9 and an angle of attack range of 4 to 13 degrees. Stability derivatives were extracted from these maneuvers, and the results from the two techniques along with wind tunnel results were compared. (Modified author abstract).
Author : John D. Bird
Publisher :
Page : 88 pages
File Size : 50,58 MB
Release : 1950
Category : Aerodynamics
ISBN :
Experimentally determined lateral-stability derivatives of a swept-wing airplane are presented to show effects of slots, flaps, propeller, and ventral fins and are sued in calculations of a number of lateral disturbed motions. The calculated motions are compared with those obtained in flight tests to determine the applicability of the experimental stability derivatives . The effects of nonlinearity of some of the aerodynamic forces with sideslip are shown by a few supplemental calculations.
Author : Frederick O. Smetana
Publisher :
Page : 122 pages
File Size : 28,67 MB
Release : 1972
Category :
ISBN :
Author : Kenneth W. Iliff
Publisher :
Page : 68 pages
File Size : 11,55 MB
Release : 1971
Category : Differential equations, Nonlinear
ISBN :
Author : James J. Donegan
Publisher :
Page : 40 pages
File Size : 35,52 MB
Release : 1951
Category : Aeronautics
ISBN :
A method is presented for obtaining the over-all longitudinal-stability coefficients and frequency response of an aircraft from an analysis of arbitrary maneuvers in which simple instrumentation is used. Although the method presented deals entirely with the aircraft, it is equally applicable to other problems which can be expressed by second-order differential equations.
Author : Robert O. Schade
Publisher :
Page : 726 pages
File Size : 47,55 MB
Release : 1952
Category : Airplanes
ISBN :
The results of an experimental and theoretical investigation of the effects of large artificial variations of four rotary stability derivatives on the dynamic lateral stability and control of a 45 degree sweptback-wing airplane model are presented. The experimental results are presented mainly in the form of flight ratings for stability, control, and general flight behavior. Calculations of period and damping and of the response of rolling and yawing disturbances are also presented.
