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B-17 YB-40 (Gunship)

1,601 Whycantimakeagoodplane66  8 months ago
Auto Credit Based on Braden's YB-40 gunship

Design and developmentClose-up of the array of .50-caliber guns on the Boeing YB-40 Flying Fortress.Work on the prototype, Project V-139, began in September 1942 by converting the second production B-17F-1-BO (serial number) built. Conversion work was done by Lockheed's Vega company.The aircraft differed from the standard B-17 in that a second manned dorsal turret was installed in the former radio compartment, just behind the bomb bay and forward of the ventral ball turret's location. The single .50-caliber light-barrel (12.7 mm) Browning machine gun at each waist station was replaced by two of them mounted side by side as a twin-mount emplacement, with a mount for each pair of these being very much like the tail gun setup in general appearance. The bombardier's equipment was also replaced by two .50-caliber light-barrel Browning AN/M2 machine guns in a remotely operated Bendix designed "chin"-location turret, directly beneath the bombardier's location in the extreme nose. (Role: Bomber Escort) (Made: 1942) (Retired 1943)

General Characteristics

  • Predecessor YB-40 gunship
  • Created On iOS
  • Wingspan 100.2ft (30.5m)
  • Length 72.7ft (22.1m)
  • Height 22.9ft (7.0m)
  • Empty Weight 28,355lbs (12,861kg)
  • Loaded Weight 41,570lbs (18,855kg)


  • Horse Power/Weight Ratio 0.132
  • Wing Loading 31.6lbs/ft2 (154.5kg/m2)
  • Wing Area 1,313.7ft2 (122.0m2)
  • Drag Points 10707


  • Number of Parts 331
  • Control Surfaces 7
  • Performance Cost 1,327