Boeing XB-38 Flying Fortress The XB-38 was destroyed and the project was canceled, in part because the V-1710 engines were needed for other projects such as the Lockheed P-38 Lightning, Bell P-39 Airacobra, Curtiss P-40 Warhawk, North American P-51A Mustang, and Bell P-63 Kingcobra fighters. Boeing XB-38 Flying Fortress The XB-38 Flying Fortress was a single example conversion of a production B-17E Flying Fortress, testing whether the Allison V-1710 V type engine could be substituted for the standard Wright R-1820 radial engine during early World War II. The XB-38 was the result of a modification project undertaken by Boeing and Vega (a subsidiary of
38th Flying Training Wing (World War II) in advanced (Phase III) two and four engine training, along with bombardier training and before June 1944, glider training. Graduates of the advanced schools were commissioned as Second Lieutenants, received their "wings" and were reassigned to Operational or Replacement Training Units operated by one of the four numbered air fores in the zone of interior. As training requirements changed during the war, schools were activated and inactivated or transferred to meet those requirements. The schools of the wing used a wide variety of planes to support its numerous training needs: 38th Flying Training Wing (World War II) The 38th Flying