| Boeing Y1b-9 |
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| u.s. bomber aircraft 1930-1939 | |
| b-09, boeing | |
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| y1b-9 | |
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The Boeing B-9 was the first all-metal Monoplane Bomber designed for the United States Army Air Corps . The first service model, dubbed the '''YB-9''', 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 (''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 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. SPECIFICATIONS (Y1B-9A)
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