SSM-A-5 Boojum

The XSSM-A-5 Boojum, also known by the project number MX-775B, was a supersonic cruise missile developed by the Northrop Corporation for the United States Air Force in the late 1940s. Intended to deliver a nuclear warhead over intercontinental range, it was determined to be too ambitious a project given technical difficulties with the SM-62 Snark which it was to follow on from, and was canceled in 1951.

XSSM-A-5 Boojum
Northrop Boojum (final).png
The final design of the XSSM-A-5
TypeCruise missile
Place of originUnited States
Service history
Used byUnited States Air Force
Production history
ManufacturerNorthrop Corporation
No. built0
Mass112,000 pounds (51,000 kg)
Length85 feet 4 inches (26.01 m)
Height14 feet 9 inches (4.50 m)

EngineTwo J47 turbojets
Wingspan50 feet 10 inches (15.49 m)
3,153 mi (5,075 km)
Flight ceiling70,000 feet (21,000 m)
SpeedMach 2
Celestial navigation


As part of a United States Army Air Forces effort to develop guided missiles for the delivery of nuclear weapons, the Northrop Corporation was awarded a development contract in March 1946 for the design of two long-range cruise missiles. Designated MX-775, the contract called for a subsonic missile, the MX-775A, later designated SSM-A-3 Snark; and a more advanced supersonic missile, MX-775B, which in 1947 was given the name SSM-A-5 Boojum,[1] Northrop naming the missiles after characters from the works of Lewis Carroll.[2]

Given the company designation of N-25B, the design of the Boojum took place over the next several years, and produced a number of variations on the concept. The finalized design called for a long, slender missile, fitted with delta wings, and powered by a pair of General Electric turbojet engines, mounted in nacelles near the tips of the wing.[1][N 1]

The missile was intended to be launched utilizing a rocket sled; air-launch from a Convair B-36 heavy bomber was an alternative that was studied.[1] The missile would climb at subsonic speeds to its operating altitude, then conduct a supersonic dash to the target area, being guided using a celestial navigation system.[1] A "slipper" type drop tank would be jettisoned halfway through the flight.[3] The Boojum was intended to be capable of carrying a warhead weighing up to 5,000 pounds (2,300 kg) over a range between 1,500 to 5,000 miles (2,400 to 8,000 km).[4]


At the end of 1946, the contracts that had been awarded to Northrop were revised; the Snark was canceled, while the Boojum was to be fully developed as an operational system.[5] Northrop lobbied for the reinstatement of the Snark, however; this was successful in getting the program reauthorized during 1947, with the Boojum being deferred to a follow-on project.[5]

Despite the design having been finalized, the United States Air Force (which the USAAF had become in 1948) determined that the project was technologically unfeasible, given continuing development difficulties and technical problems encountered during the Snark's development. Accordingly, in 1951, the Boojum project canceled, before any prototypes of the missile had been constructed.[1][4]

See alsoEdit



  1. ^ A similar configuration would later be used by the Lockheed SR-71 Blackbird reconnaissance aircraft.


  1. ^ a b c d e Parsch 2007
  2. ^ Collins 2007, p.26.
  3. ^ Werrell 1985, p.141.
  4. ^ a b Polmar and Norris 2009, p.178.
  5. ^ a b Werrell 1985, p.93.


  • Collins, Martin J. (2007). After Sputnik: 50 Years of the Space Age. New York: HarperCollins. ISBN 978-0-06-089781-9. Retrieved 2011-02-12.
  • Parsch, Andreas (2007). "Northrop SSM-A-5 Boojum". Directory of U.S. Military Rockets and Missiles. Retrieved 2011-02-12.
  • Polmar, Norman; Robert Stan Norris (2009). The U.S. Nuclear Arsenal: A History of Weapons and Delivery Systems Since 1945. Annapolis, MD: Naval Institute Press. ISBN 978-1-55750-681-8. Retrieved 2011-02-12.
  • Werrell, Kenneth. (1985) The Evolution of the Cruise Missile. Maxwell AFB, AL: Air University Press. ASIN B000R51FWA. Retrieved 2011-02-12