The Curtiss-Wright X-100 was built primarily to flight test Curtiss-Wright¡s concept of using propeller "radial force" instead of wing lift for conventional flight. It first hovered in free flight in September 1959 and made its first short take-off and landing flight on March 1960. Its first and only transition from vertical to horizontal took place in April 1960.

Credits - Curtiss-Wright Corp.