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Boeing Y1B-20

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Boeing Y1B-20
Type Heavy bomber
Manufacturer Boeing
Maiden flight n/a
Status Cancelled
Primary user United States Army Air Forces
Number built 0

The Boeing Y1B-20 (Boeing 316) was designed as an improvement on the Boeing XB-15. (Y1B- indicates a funding source outside normal fiscal year procurement.) It was slightly larger than its predecessor, and was intended to use much more powerful engines. It was presented to the Army in early 1938, and two orders were placed soon after. The order was reversed before construction began.

Despite their cancellation, the XB-15 and Y1B-20 laid the groundwork for the B-29 Superfortress, one of the most famous and most successful World War II bombers.

Specifications (as designed)

General characteristics

  • Crew: 10
  • Length: 109 ft 2 in (33.3 m)
  • Wingspan: 157 ft 0 in (47.8 m)
  • Height: 23 ft 4 in (7.1 m)
  • Wing area: ft² (m²)
  • Empty weight: 87,500 lb (39,700 kg)
  • Loaded weight: 91,500 lb (41,500 kg)
  • Max takeoff weight: 105,100 lb (47,700 kg)
  • Powerplant:Wright GR-2600-A73 , 1,350 hp (1,000 kW) each



  • Guns:
    • 3× .30 in (7.62 mm) machine guns
    • 4× .50 in (12.7 mm) machine guns
  • Bombs: 17,600 lb (6,620 kg)

External links

Related content

Related development

Comparable aircraft

Designation sequence

345 (B-29)
345 (B-39)
345 (B-44)
345 (B-50)

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