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Boeing Y1B-20

Experimental Heavy Bomber Aircraft

Though a production order was signed for two prototypes, the US Army was quick to cancel the large experimental Boeing Y1B-20.
Authored By: Staff Writer | Edited: 4/4/2019
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Year: 1938
Status: Cancelled
Manufacturer(s): Boeing Company - USA
Production: 0
Capabilities: Ground Attack; X-Plane;
Crew: 10
Length: 109.25 ft (33.3 m)
Width: 156.82 ft (47.8 m)
Height: 23.29 ft (7.1 m)
Weight (Empty): 87,524 lb (39,700 kg)
Weight (MTOW): 105,160 lb (47,700 kg)
Power: 4 x Wright GR-2600-A73 radial piston engines developing 1,350 horsepower each driving three-bladed propeller units.
Speed: 258 mph (415 kph; 224 kts)
Range: 3,977 miles (6,400 km; 3,456 nm)
Operators: United States
Leading up to its famous stable of World War 2 heavy bombers, Boeing undertook a variety of projects to further existing technologies and enhance qualities for long endurance flight of heavy airframes. One such program became the Y1B-20 (Boeing Model 316), an offshoot of the experimental XB-15. The original XB-15 was born of a 1933 United States Army Air Corps (USAAC) initiative seeking a bomber capable of 5,000 mile endurance reaching speeds of 200 miles per hour with a 2,000lb bomb load. The Y1B-20 was essentially an evolved, dimensionally larger version designed around use of more powerful engines - 4 x Wright GR-2600-A73 rated at 1,350 horsepower being the intended type. While presented to the Army (and accepted through two prototype orders), the product was cancelled before manufacture of either airframe had begun. As such, no examples were ever completed by Boeing and the project was lost to aviation history.

The four-engine arrangement and general aerodynamic design of the Y1B-20 was estimated to allow for a maximum speed of 258 miles per hour with a cruising speed of 242 miles per hour. Operational range was listed at 4,000 miles. Comparatively, the YB-15 - which saw considerably more interest and usage by the US Army - exhibited a maximum speed of 200 miles per hour and cruising at 150 miles per hour. Range was 5,130 miles while its service ceiling was 18,900 feet. The famous B-17 (G-model) allowed for a maximum speed of 290 miles per hour, cruising at 180 miles per hour, a range of 2,000 miles and a service ceiling of 35,600 feet.

As a heavy bomber, the Y1B-20 was slated to carry ordnance loads up to 17,600lbs internally. As with other bombers of the period, the aircraft was to be defensed through a network of purposefully placed machine guns numbering seven - 3 x 0.30 caliber and 4 x 0.50 caliber in nature.

At any rate, like the XB-15 before it, the Y1B-20 helped Boeing to lay the foundation for its stable of important bombers serving during World War 2 and beyond.


3 x 0.50 caliber Browning M2 heavy machine guns.
3 x 0.30 caliber Browning M1919 machine guns.

Up to 17,600lb of internal stores (conventional drop bombs).

Graphical image of an aircraft medium machine gun
Graphical image of an aircraft heavy machine gun
Graphical image of an aircraft conventional drop bomb munition

Variants / Models

• Y1B-20 - Base Series Designation
• Model 316 - Boeing Company Model Designation
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