Flying qualities problems of modern, full-authority electronic flight control systems are most often related to the introduction of additional time delay in aircraft response to a pilot input. These delays can have a significant effect on the flying qualities of the aircraft. Time delay effects are reexamined in light of recent flight test experience with aircraft incorporating new technology. Data from the X-29A forward-swept-wing demonstrator, a related preliminary in-flight experiment, and other flight observations are presented. These data suggest that the present MIL-F-8785C allowable-control system time delay specifications are inadequate or, at least, incomplete. Allowable time delay appears to be a function of the shape of the aircraft response following the initial delay. The cockpit feel system is discussed as a dynamic element in the flight control system. Data presented indicate that the time delay associated with a significant low-frequency feel system does not result in the predicted degradation in aircraft flying qualities. The impact of the feel system is discussed from two viewpoints: as a filter in the control system which can alter the initial response shape and, therefore, the allowable time delay, and as a unique dynamic element whose delay contribution can potentially be discounted by special pilot loop closures.


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    Title :

    Effect of Time Delay on Flying Qualities: An Update


    Contributors:

    Publication date :

    1986


    Size :

    13 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




    Effect of time delay on flying qualities - An update

    Smith, R. E. / Sarrafian, S. K. | NTRS | 1986



    Effect of time delay on flying qualities - An update

    Smith, R. E. / Sarrafian, S. K. | NTRS | 1986


    Effect of time delay on flying qualities: An update

    Smith, R. E. / Sarrafian, S. K. | NTRS | 1986


    Effect of time delay on flying qualities - An update

    SMITH, R. E. / SARRAFIAN, S. K. | AIAA | 1986