## Measurements of Ground Effect on a Low-aspect-ratio Ogee-wing Airplane Model and Calculations of Landing-flare Trajectories |

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10-foot tunnel 6.8 feet/second aerodynamic characteristics airplane entering ground angle of attack angle-of-attack range CALCULATIONS OF LANDING-FLARE configuration descent rates encountered drag coefficient drag usually encountered dynamic pressure Effect of model elevon characteristics encountered at touchdown entering ground effect equations of motion excessive for normal feet/second 2.07 meters/second fighter-type airplane flare flight-path angle free-stream velocity ft/sec full-scale airplane ground proximity ground-plane belt ground-plane boundary layer ground-plane boundary-layer removal increases in lift-curve induced drag usually initial conditions landing gear landing trajectories LANDING-FLARE TRAJECTORIES Langley 300-MPH Langley Research Center lift coefficient lift-curve slope longer time spent longitudinal stability low-lift coefficients m/sec model height model-support moving belt moving-belt ground plane NASA TN normal load factor normal operational landing Ogee ogee-wing planform Physical Constants pitch attitude pitching-moment coefficient Pitching-moment parameters rate of descent reduction in induced Reynolds number shown in figure slope and longitudinal sq ft System of Units wind-tunnel wing