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60-Foot Tunnel adverse sidewash ailerons airplane configuration angle of attack attack is increased basic configuration chord Cngd coefficient control characteristics deg Figure deg/sec directional divergence directional instability directional stability becomes downwash dynamic stability EA-6B airplane effective dihedral feedback gain Figure 17 flaperon deflection flow-visualization tests free-flight tests fuselage gle of attack high angles high-angle-of-attack higher angles horizontal tail improve Inboard leading-edge droop inboard wing-leading-edge droop investigation Langley 30 Langley Research Center leading-edge glove strake lift coefficient longitudinal loss of directional maximum modified configuration NACA NASA pilot positive with trailing powered approach configuration presented in figure Reynolds numbers roll control roll damping Root chord rudder shown in figure sideslip speed brakes speed-brake panels stability and control stability becomes zero stability derivatives stability of cruise static force tests static lateral-directional stability takeoff takeoff-powered approach configuration trailing edge trailing-edge sections unstable vertical tail vertical-tail extension vortex system wind-tunnel windward vortex