The Boeing XP-8 (Boeing Model 66) was a prototype American biplane fighter of the 1920s, notable for its unusual design incorporating the engine radiator into the lower wing. == Design and development == Boeing developed the prototype in 1926 as a private venture, with the goal of winning the Army Air Corps competition announced in 1925.
The Boeing XP-8 (Boeing Model 66) was a prototype American biplane fighter of the 1920s, notable for its unusual design incorporating the engine radiator into the lower wing. == Design and development == Boeing developed the prototype in 1926 as a private venture, with the goal of winning the Army Air Corps competition announced in 1925.
Source: Wikipedia "Boeing XP-8" · CC BY-SA 4.0
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