EntityQ1145680· pop 20· linked from 210 articlesX-19Sign in to save1963 experimental tiltrotor aircraft by Curtiss-WrightConnectionsBell/Boeing V-22 OspreyEntitylist of X-planesEntityT55EntityInternational Standard Book NumberEntityhelicopterEntityWayback MachineEntityDaytonEntityUnited States Air ForceEntityprototypeEntityCurtiss P-40 WarhawkEntityX-15EntityX-1EntityBoeing X-37EntityfuselageEntityaircraft propellerEntityCurtiss SB2C HelldiverEntityNASA X-43EntityX-20 Dyna-SoarEntityGrumman X-29EntityCurtiss C-46 CommandoEntityCategories1950s United States experimental aircraftAircraft first flown in 1963Aircraft with retractable tricycle landing gearCurtiss aircraftQuadrotorsTandem-wing aircraftTiltrotor aircraftTurboshaft-powered aircraftTwin-engined four-prop tractor aircraft