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)
Short take off performance using a gravity assist ski jump
Kurzstartflugzeug mit gravitationsueberwindendem Kufenfahrwerk
US Government Reports ; Mar ; 1-34
1983
34 Seiten
Report
Englisch
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