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XB-44 Superfortress

From PlaneSpottingWorld, for aviation fans everywhere

The Boeing XB-44 was a B-29 Superfortress upgraded with Pratt & Whitney R-4360-33 Wasp Major supercharged radial engines.

First flying in May 1945, the XB-44 proved 50 mph faster than the B-29. Production was planned as the B-29D, but became the B-50 in December 1945. Officially, the aircraft's new designation was justified by the changes separating the B-29D from its predecessors- a common practice under this designation system and era. Unlike later designation system aircraft families were given many more letter number combinations; the DC-2 family was given 8 different letter-number combinations.


  • Knaack, Marcelle Size. Post-World War II Bombers. Washington, D.C.: Office of Air Force History, 1988. ISBN 0-912799-59-5. p. 163.

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Designation sequence

345 (B-29) - 367 - 377 - 400
345 (B-39)
345 (B-44)
345 (B-50)

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