Method for Evaluating the Effectiveness and Weight of Aircraft Deceleration Devices
Final rept. 15 Jun 1967-15 Jun 1968
ROHR CORP CHULA VISTA CA
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A program was established in order to develop a standard and expedient method for estimating the performance and weights of deceleration devices used to decrease the landing ground roll of an aircraft. The method of approach to the problem was to obtain all data available both from flight test and theory and to compile a step-by-step procedure for determining the weight penalties and the force increments affecting aircraft landing performance. Specifically, procedures are provided for determining airplane lift and drag, and decelerative force increments and weight penalties due to high lift devices, spoilers, wheel brakes, speed brakes, drag chutes and thrust reversers. In addition, a cursory study was made to evaluate the effectiveness of various factors affecting landing distance of three current military aircraft. The study showed that the ground roll distance was strongly influenced by touchdown speed also that, of all the decelerating devices studied, the thrust reverser was the one most effective in reducing stopping distance. It is therefore recommended that further studies be conducted to optimize thrust reversers and devices such as deflected thrust, which reduce touchdown velocity.
- Gliders and Parachutes