From TheBestLinks.com
| Boeing Y1B-9
|
|
|
| Description
|
| Rôle | Light bomber
|
| Crew | Four
|
| First Flight |
|
| Entered Service | n/a
|
| Manufacturer | Boeing
|
| Number built | 1 YB-9, 1 Y1B-9, 5 Y1B-9A
|
| Dimensions
|
| Length | 52 ft | 15.8 m
|
| Wingspan | 76 ft 10 in | 23.4 m
|
| Height | 12 ft | 3.7 m
|
| Wing area | ft² | m²
|
| Weights
|
| Empty | lb | kg
|
| Loaded | 12,633 >> 13,932 lb | 5,730 >> 6,319 kg
|
| Maximum takeoff | lb | kg
|
| Capacity |
|
| Powerplant
|
| Engines | Pratt & Whitney R-1830-13 radial engines (2)
>> Curtiss V-1570-29 'Conqueror' (2)
|
| Power | 575 hp >> 600 hp | 429 kW >> 447.6 kW
|
| Performance
|
| Maximum speed | 163 mph >>
188 mph | 262.3 km/h >> 302.5 km/h
|
| Cruising speed | 137 mph >>
165 mph | 220.4 km/h >> 265.5 km/h
|
| Combat range | 500 miles >> 540 miles | 804 km >> 868 km
|
| Ferry range | miles | km
|
| Service ceiling | 19,400 >> 20,750 ft | 5,913 >> 6,324 m
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| Rate of climb | ft/min | m/min
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| Wing loading | lb/ft² | kg/m²
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| Power/Mass | .091 hp/lb >> .086 hp/lb | .15 kW/kg >> .142 kW/kg
|
| Armament
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| Guns | .30-calibre (7.62 mm) machine guns (2)
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| Bombs | 2,200 lb (1,000 kg)
|
The Boeing B-9 was the first all-metal monoplane bomber designed for the U.S. Army. The first service model, dubbed the YB-9 (http://www.wpafb.af.mil/museum/research/bombers/b1-54.htm), was originally tested and developed by Boeing as XB-901. The YB-9 was an enlarged alteration of Boeing's Model 200 Commercial Transport. The Pratt & Whitney R-1830-13 radial engines used on the YB-9 gave it a top speed of 163 mph (262 km/h).
The second test model, named the Y1B-9 (http://www.wpafb.af.mil/museum/research/bombers/b1-55.htm) (Y1B- indicating funding outside normal fiscal year procurement), used liquid-cooled Curtiss V-1570-29 'Conqueror' engines. The increased power from these engines, combined with increased streamlining of the engine nacelles, increased its top speed to 173 mph (278 km/h). With the exception of the B-2 Condor, liquid-cooled engines were never used on production bombers for the US military. The air-cooled radial engine was simpler and more reliable than the liquid-cooled engine, and less vulnerable to enemy damage.
The Y1B-9A (http://www.wpafb.af.mil/museum/research/bombers/b1-56.htm) was an improved version of the YB-9, featuring more powerful engines and a redesigned vertical stabiliser. Utilising two Pratt & Whitney R-1860-11 'Hornets', the plane was faster than any contemporary Pursuit aircraft. The Y1B-9 was the first closed-cockpit plane flown by the Army. Its high speeds made open cockpits extremely impractical.
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