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Bell X-2 (Starbuster) - United States, 1955


Detailing the development and operational history of the Bell X-2 (Starbuster) Experimental Research Aircraft.


 Entry last updated on 10/24/2017; Authored by Staff Writer; Content ¬©www.MilitaryFactory.com

  Bell X-2 (Starbuster)  
Picture of Bell X-2 (Starbuster)


Like other American 1950s research aircraft, the Bell X-2 proved critical in furthering the frontiers of powered, manned high-speed flight.







Bell Aircraft Company was once again contracted by the National Advisory Committee for Aeronautics (NACA) and the United States Air Force (USAF) to provide a high-speed, rocket-powered research aircraft following their success with the Bell X-1 project of the late 1940s. This provided the impetus for the subsequent Bell X-2 to appear in the mid-1950s and continue the rigorous flight testing regime into the Mach 2 / Mach 3 speed range. The X-2 was essentially an evolved, more capable version of the X-1. A pair of X-2 aircraft were completed for the tests ahead and the product nicknamed "Starbuster".

To power the new aircraft the two-chamber, variable thrust Curtiss-Wright XLR-25 rocket engine of up to 15,000 lb output was installed and mated to throttle controls (controls which the X-1 lacked). Aerodynamic refinements were present about the sleeker, slimmer fuselage and a low-mounted, swept-wing mainplane assembly was used (unlike the straight wings of the X-1). The tail remained a single vertical fin with mid-mounted horizontal planes though all leading edges were also swept.

As with the X-1, the X-2 was an air-launched vehicle though this time a specially-modified Boeing B-50 Superfortress substituted for the original B-29 mothership. Also as in the X-1, the X-2 completed its first test flights solely under glide power with the first undertaken on June 27th, 1952 - landings aided by an integrated wheeled undercarriage arrangement. The first rocket-powered flight did not come until November 18th, 1955.






The X-2 became a record setter in its own right when it achieved a new speed record of Mach 2.87. It also became the first powered, manned aircraft to break the 100,000 foot altitude ceiling when it reached 126,200 feet on September 7th, 1956 (test pilot Iven Kincheloe at the controls). With some modifications added for Mach 3+ flight controlling, the X-2 then became the first aircraft to exceed Mach 3.0 on September 27th, 1956 (test pilot Milburn Apt). However, during this same flight, the aircraft experienced "inertia coupling" which spun the rocket plane out of control, killing Apt during his attempted ejection on May 12th, 1953.

Apt's death delayed further work involving the X-2 and the product was formally written off altogether in anticipation of the arrival of the more advanced North American X-15 rocket research aircraft arriving in the late part of the decade. Three of its kind would be built and the program would provide additional high speed data until its retirement in December of 1968.

As it stood, only the first X-2 prototype achieved any powered flights - 10 total - with seven glide flights to its name from the period of June 1952 to September 1956. The second prototype never completed its only powered flight and added three glide flights to its record before the end.




Bell X-2 (Starbuster) Specifications



Service Year: 1955
Status: Retired, Out-of-Service
Type: Experimental Research Aircraft
National Origin: United States
Manufacturer(s): Bell Aircraft - USA
Total Production: 2


Structural (Crew, Dimensions, Weights)



Operating Crew (Typical): 1
Overall Length: 37.73 feet (11.5 meters)
Overall Width: 32.15 feet (9.80 meters)
Overall Height: 11.81 feet (3.60 meters)

Weight (Empty): 12,346 lb (5,600 kg)
Weight (MTOW): 24,912 lb (11,300 kg)

Power / Performance (Engine Type, Top Speed)



Engine: 1 x Curtiss-Wright XLR25 rocket engine developing 15,000 lb of thrust.

Maximum Speed: 1,820 knots (2,094 mph; 3,370 kph)
Service Ceiling: 126,198 feet (38,465 meters; 23.90 miles)

Armament / Mission Payload



None. Internal provision housing flight data and test equipment.

Global Operators (Customers, Users)



United States

Model Variants



X-2 - Base Series Designation; two examples completed with the second aircraft lost to an in-flight accident.


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