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adverse yaw aileron stick force Airplane Conditions Bell Aircraft Corporation Bell P-63A-1 airplane Bell P-J9D-1 airplane center of gravity center-of-gravity positions clean condition COMMITTEE FOR AERONAUTICS control characteristics directional stability dorsal fin due to sideslip effect elevator stick force enlarged horizontal tail enlarged vertical tail flaps and gear flight tests fuselage gross weight inches increase installed Langley Field level-flight speed lift coefficient longitudinal-stability mean aerodynamic chord miles per hour NACA normal acceleration normal rated power nose wheel original vertical tail oscillation P-63 airplane percent mean aerodynamic pounds power 2600 RPM rated power 2600 rated-power rearward recovery required to trim rolling maneuvers rolling velocity rudder force shown in figure sideslip angle Sideslip characteristics spiral divergence sq ft stability and control stability characteristics stabilizer incidence stalling speed steady turning stick-fixed stick-force gradient stick-free straight flight take-off trim tab trimmed to zero turning flight vertical-tail loads wing guns