Douglas 423

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Douglas Model 423
Role Heavy bomber
Manufacturer Douglas Aircraft
Status Design only
Primary user United States Army Air Force
Number built 0

The Douglas Model 423 was a bomber aircraft design developed by American aircraft manufacturer Douglas to compete with the Convair B-36 design for a major U.S. Army Air Force contract for an intercontinental bomber in 1941. Although identified as the Douglas XB-31 in some publications, the project documents indicate that it was designed much later than the R40-B competition.


In April 1941, the possibility of Great Britain falling to Nazi Germany seemed very real, and so the United States Army Air Corps unveiled a competition for a long-range bomber with intercontinental range (10,000 miles), making it capable of conducting air-strikes on Nazi-occupied Europe from US bases. Douglas stated that it did not wish to produce an 'out-and-out 10,000-mile (16,090 km) airplane project', instead proposing the Model 423 with a range of 6,000 miles (9,654 km).[1] The Douglas Model 423 was eventually rejected in favor of the Consolidated Model 36, which became the Convair B-36 Peacemaker.

Specifications (Model 423)[edit]

(Note: The primary source labels this project as the XB-31, which was much smaller, earlier project, competing with the B-29 and B-32)

Data from McDonnell Douglas aircraft since 1920 : Volume I (erroneously labelled as XB-31)[2]

General characteristics

  • Crew: 8
  • Length: 117 ft 3 in (35.74 m)
  • Wingspan: 207 ft (63 m)
  • Height: 42 ft 7 in (12.98 m)
  • Wing area: 3,300 sq ft (310 m2)
  • Empty weight: 109,200 lb (49,532 kg)
  • Max takeoff weight: 198,000 lb (89,811 kg)
  • Powerplant: 4 × Pratt & Whitney R-4360 Wasp Major 28-cylinder air-cooled radial piston engines, 3,000 hp (2,200 kW) each
  • Propellers: 3-bladed constant-speed propellers

Performance Armament

  • Guns:
    • 6× 0.50 in (13 mm) machine guns in remote ventral and dorsal turrets
    • 2× 37 mm (1.5 in) cannon
  • Bombs:
    • 25,000 lb (11,000 kg) of bombs

See also[edit]

Aircraft of comparable role, configuration and era

Related lists



  1. ^ Buttler, Tony, and Griffith, Alan, 2015. American Secret Projects: Fighters, Bombers, and Attack Aircraft, 1937–1945. Manchester: Crecy Publishing. ISBN 978-1906537487.
  2. ^ Francillon, René J. (1988). McDonnell Douglas aircraft since 1920 : Volume I. London: Naval Institute Press. p. 607. ISBN 0870214284.


  • Francillon, René J. McDonnell Douglas Aircraft since 1920. London: Putnam & Company Ltd., 1979. ISBN 0-370-00050-1.
  • Jones, Lloyd S. U.S. Bombers: B-1 1928 to B-1 1980s. Fallbrook, California: Aero Publishers, Inc., 1974. ISBN 0-8168-9126-5.

External links[edit]