A modified or gravity assit ski jump is developed, through an application of the calculus ov variations, to provide for the shortest takeoff roll for a thrust vector control type vertical or short takeoff and landing (V/STOL) aircraft that will maintain a better-than-minimum required rate of climb. As a means of comparisons between the resulting modified and a conventional ski jump, the equations of motion are programmed to model the takeoff performance using a ski jump. The results of this model are found to compare well with Naval Air Test Center ski jump test results of the AV-8A aircraft. A comparison of the standard and gravity assist ski jump shows a reduction of 30 percent in required ground roll and 20 percent in distance to a 50-ft altitude, while maintaining a better-than-minimum required rate of climb, with the modified ramp. A simpel modified ramp, using a pair of standard multiple girder bridging (MGB) ramps, is shown to provide similar improvements in takeoff performance. (DePo)


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    Title :

    Short take off performance using a gravity assist ski jump


    Additional title:

    Kurzstartflugzeug mit gravitationsueberwindendem Kufenfahrwerk


    Contributors:
    Furey, R.J. (author)

    Published in:

    Publication date :

    1983


    Size :

    34 Seiten


    Type of media :

    Report


    Type of material :

    Print


    Language :

    English




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