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  • Aircraft Stability and Control
  • 1980-1984  (2)
  • 1940-1944  (1)
  • 1935-1939
  • 1
    Publication Date: 2019-06-28
    Description: A pursuit type airplane encountered severe diving moments in high-speed dives which make recovery difficult. For the purpose of investigating these diving moments and finding means for their reduction, a 1/6-scale model of the airplane was tested in the 16-foot high-speed wind tunnel at Ames Aeronautical Laboratory. The test results indicate that up to a Mach number of at least 0.75, the limit of the tests, the dive-recovery difficulties can be alleviated and the longitudinal maneuverability improved by the substitution of a long symmetrical fuselage for the standard fuselage.
    Keywords: Aircraft Stability and Control
    Type: NACA-WR-A-65
    Format: application/pdf
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  • 2
    Publication Date: 2019-07-13
    Description: A fully coupled vibration model, consisting of a rotor with only flapping degrees of freedom plus pylon and fuselage pitching motion, was used in a parametric study undertaken to investigate the response characteristics of a simplified helicopter. Among the parameters studied were uncoupled body frequency, blade stiffness, hinge offset, advance ratio, and mast height. Results from the harmonic balance solution of the equations of motion show how each of these quantities affects the response of the model. The results also indicate that there is a potential for reducing vibration response through the judicious definition of the design parameters.
    Keywords: Aircraft Stability and Control
    Type: AIAA Paper 81-0616R , Dynamics Specialists Conference; Apr 09, 1981 - Apr 10, 1981; Atlanta, GA; United States|Journal of Aircraft; 19; 4; 297-303
    Format: text
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  • 3
    Publication Date: 2019-07-13
    Description: Inadequacies in the military specification for helicopter handling qualities, MIL-H-8501A, have long been recognized, and the latest procurements by the U.S. Army used special Prime Item Development Specifications (PIDS). This paper assesses the efficacy of these PIDS and suggests that changes should be made. In particular, the structure developed in MIL-F-8785B (ASG) (the specification for flying qualities of piloted airplanes) should be incorporated. Improved requirements must be based on a systematic data base and concentrated on topics most important in preliminary design: static and dynamic stability, control power and sensitivity, and interaction with controllers and displays. Emphasis should be on current military helicopter missions and helicopter idiosyncrasies such as cross-coupling, nonlinearities, and higher-order dynamics.
    Keywords: Aircraft Stability and Control
    Type: AIAA Paper 80-1592R , Atmospheric Flight Mechanics Conference; Aug 11, 1980 - Aug 13, 1980; Danvers, MA; United States|Journal of Aircraft; 19; 2; 138-144
    Format: text
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