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| Y1B-20
|
| Description
|
| Role | Heavy bomber
|
| Crew | 10
|
| First Flight | n/a
|
| Entered Service | n/a
|
| Manufacturer | Boeing
|
| Number built | 0
|
| Planned Dimensions
|
| Length | 109 ft 2 in | 33.3 m
|
| Wingspan | 157 ft | 47.8 m
|
| Height | 23 ft 4 in | 7.1 m
|
| Wing Area | ft² | m²
|
| Weights
|
| Empty | 87,500 lb | 39,690 kg
|
| Loaded | 91,500 lb | 41,504 kg
|
| Maximum Takeoff | 105,100 lb | 47,673 kg
|
| Capacity |
|
| Powerplant
|
| Engines | Wright GR-2600-A73 geared radials (4)
|
| Power | 1,350 hp | 1007 kW
|
| Estimated Performance
|
| Maximum Speed | 258 mph | 415 km/h
|
| Cruising Speed | 242 mph | 389 km/h
|
| Combat Range | 4,000 miles | 6436 km
|
| Rate of Climb | ft/min | m/min
|
| Wing Loading | lb/ft² | kg/m²
|
| Power/Mass | .059 hp/lb | .097 kW/kg
|
| Armament
|
| Guns | .30-calibre machine guns (3), .50-calibre machine guns (4)
|
| Bombs | 17,600 lb
|
The Boeing Y1B-20 (Model 316) was designed as an improvement on the XB-15. (Y1B- indicates a funding source outside normal fiscal year procurement.) It was slightly larger than its predecessor, and used much more powerful engines. It was presented to the Army in early 1938, and two orders were planced soon after. The order was reversed before construction began.
Despite their failure, the XB-15 and Y1B-20 laid the groundwork for the B-29 Superfortress, one of the best World War II bombers.
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