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The second X-4 Bantam in flight[1]

The X-4 was an experimental aircraft intended to evaluate flight conditions at transonic speeds.

History[]

Development of the X-4 began on5 April 1946, when the US Army Air Force's Technical Service awarded Northrop Aircraft Corporation a contract for construction and preliminary flight testing for a pair of XS-4 research aircraft, as part of project MX910.[2]

References[]

  1. War thunder X-4
  2. Miller, Jay. The X Planes X-1 to X-45. Midland Publishing. 2001. ISBN 1 85780 109 1 Page 80