American bomber project
The Boeing Y1B-20 (Boeing 316) was designed as an improvement on the Boeing XB-15. 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 Boeing B-29 Superfortress.
Specifications (as designed).
General characteristics* Crew: 10* Length: ()* Wingspan: ()* Height: ()* Empty weight: ()* Gross weight: ()* Max takeoff weight: ()* Powerplant: 4 × Wright GR-2600-A73
 geared radials
, 1,350 hp (1,000 kW) 
Performance* Maximum speed: (, )* Cruise speed: (, ) * Range: (, ) * Power/mass: 0.059 hp/lb (97 W/kg)
Armament
See also.
Related development
Aircraft of comparable role, configuration, and era
Related lists
References.
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