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North American XB-21

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The North American XB-21 (North American NA-21) was a prototype bomber aircraft evaluated by the United States Army Air Corps in 1937 but not ordered into production. The North American assigned model number was NA-21.

The aircraft first flew on December 22 1936 and the type was promising enough for the Air Corps to initially place an order for five YB-21 pre-production machines. All these were cancelled, however, when it was found that Douglas' comparable B-18 Bolo was available for around half the price ($63,977 against $122,600). Consequently, no aircraft other than the single initial prototype were built.

Specifications (XB-21)

General characteristics

  • Crew: 6-8
  • Length: 61 ft 9 in (18.8 m)
  • Wingspan: 95 ft 0 in (29.0 m)
  • Height: 14 ft 9 in (4.50 m)
  • Wing area: 1,120 ft² (104 m²)
  • Empty weight: 19,082 lb (8,674 kg)
  • Loaded weight: 27,253 lb (12,388 kg)
  • Max takeoff weight: 40,000 lb (18,000 kg)
  • Powerplant:Pratt & Whitney R-2180-1 radial engines, 1,200 hp (900 kW) each



References and external links

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Comparable aircraft

Designation sequence

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ja:XB-21 (爆撃機)