High Gallery
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U.
S. Military Aircraft Boeing Y1B-9A Musee de 1' Air |
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In 1930, drawing on its experience with the model 200 monomial monoplane, Boeing began the private venture design of a revolutionary bomber using the same combination of low set cantilever wing, stressed-skin fuselage, and retractable landing gear. The company planned inline and radial engine variants as the model 214 and 215 respectively. First to fly, in April 1931 was the model 215 with two 575-hp Pratt & Whitney R-1860-13 radials. The US Army Air Corps evaluated this type as the XB-901, and then bought it as the YB-9. The service also bought the incomplete model 215 as the Y1B-9 and order five of an improved version as the Y1B-9A (company designation model 246) The Y1B-9 flew in November 1931 with 600-hp Curtiss V-1570-29 Conqueror engine but was soon re-engine with R-1860s, an the Y1B-9As were completed with this engine. Extensive testing confirmed the overall capability of the Boeing design, but a production contract went instead to the Martin B-10 with its nose mounted gun turret and enclosed cockpit. |
TECHNICAL DATA
| Description |
Specifications |
| Manufacturer: Boeing | Length: 51 ft. 9 in. |
| First Flight: April 1931 | Height: 12 ft. 0 in. |
| Model: Y1B-9A | Wing Span: 76 ft. 10 in. |
| Crew: Five | Wing Area: 954.0 sq. ft. |
| Nickname: | Empty Weight: 8,941 lb. |
| Basic Role: Light bomber. | Max. Weight: 14,320 |
| Other Versions: YB-9: model 215, YIB-9: model 214, YIB-9A: model 46 with specifically military equipment and a revised vertical tail. | Armament: Two 0.3-in (7.62-mm) trainable machine guns, and up to 2,260 lb. of bombs lb. |
| Principal User: U. S. A. |
Propulsion |
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Performance |
Power Plant: Pratt & Whitney SR-1860-11 radial piston engines. |
| Range: 540 miles. | Horsepower: 600-hp. |
| Max. Speed: 186 mph. | No. Of Engines: Two |
| Ceiling: 20,750 ft. | |
| Climb Rate: 900 ft. per minute. |