The North American X-10 (originally designated RTV-A-5) was an unmanned technology demonstrator developed by North American Aviation. It was a subscale reusable design that included many of the design features of the SM-64 Navaho missile. The X-10 was similar to the development of the Bell X-9 Shrike project, which was based on features of the GAM-63 RASCAL. Development To facilitate development of the long-range Navaho surface-to-surface cruise missile, North American Aviation (NAA) developed the RTV-A-5 (Research Test Vehicle, Air Force), or X-10 in 1951. This vehicle was to prove critical flight technology for the design of the Navaho cruise missile. These included proving the basic aerodynamics to Mach 2, flight testing the inertial guidance unit and flight control avionics to the same speed, and validate the recovery system for the next phase in the Navaho program. Preliminary design of the X-10 was completed in February 1951 and the first vehicle was delivered to Edwards Air Force Base in May 1953. The first flight occurred on 14 October 1953. The X-10 was powered by two Westinghouse J40 turbojet engines with afterburners, and equipped with landing gear for conventional take off and landing. The combination of a delta wing with an all-moving canard gave it extremely good aerodynamics in the transonic and supersonic environments. It also made the vehicle unstable requiring active computer flight control in the form of an autopilot. Thus, the X-10 is similar to modern military fighters which are flown by the onboard computer and not directly by the pilot. Though the X-10 was receiving directional commands from a radio-command guidance system, these commands were sent through the on-board computer which implemented the commands. Later X-10s included an N-6 inertial navigation system which completely controlled the vehicle through the cruise portion of the flight. Operational history At the time it entered service, the X-10 was one of the fastest turbojet-powered aircraft flown. From 1953 to 1955 a total of five X-10s flew 15 flights at Edwards AFB. There it reached a maximum flight speed of Mach 1.84, flew a distance of , and reached an altitude of . These were performance levels superior to nearly all manned turbojet aircraft (the exception being the YF-104 Starfighter). In 1955 the program moved to Cape Canaveral, Florida, to complete the test program. Here a new set of six X-10 vehicles completed the testing of the N-6 inertial navigation system at supersonic speeds,