- #Cleveland plans boeing model 94 mailplane skin#
- #Cleveland plans boeing model 94 mailplane registration#
The new bomber proved impossible to intercept during air exercises in May 1932, strengthening calls for improved air defense warning systems. The first of the five Y1B-9As entered service with the 20th and 49th Bombardment Squadrons, 2nd Bomb Group on 14 September 1932, with all being in service by the end of March 1933. Martin Company had flown a prototype of a more advanced bomber, the XB-907, which was ordered into production as the Martin B-10. Although it equaled the speed of all existing American fighter aircraft, no further aircraft were built, as the Glenn L. While enclosed canopies were considered and designed, the B-9 was never fitted with them.
The five Y1B-9A service test aircraft had the Pratt & Whitney R-1860-11 Hornet engines which powered the re-engined YB-9 and Y1B-9 and a redesigned vertical stabilizer. The air-cooled radial engine was lighter and more reliable than the liquid-cooled engine, and less vulnerable to enemy damage. With the exception of the B-2 Condor, liquid-cooled engines were never used on production bombers for the United States military. The YB-9, meanwhile, had been re-engined with more powerful Hornets, demonstrating slightly better performance than the Y1B-9, which was therefore also re-engined with Hornets. The increased power from these engines, combined with increased streamlining of the engine nacelles, increased its top speed to 173 mph (278 km/h). The Y1B-9 ( Y1 indicating funding outside normal fiscal year procurement), powered by two liquid-cooled Curtiss V-1570-29 'Conqueror' engines, first flew on 5 November 1931. Testing was successful, and both the XB-901 and the as-yet incomplete Model 214 were purchased as the YB-9 and Y1B-9 respectively on 13 August 1931, with an order for a further five for service testing following shortly. It was leased to the Air Corps for testing under the designation XB-901, demonstrating a speed of 163 mph (262 km/h).
#Cleveland plans boeing model 94 mailplane registration#
The first of the two prototypes to fly was the radial powered Model 215 which, carrying civil markings and the aircraft registration X-10633, made its maiden flight on 13 April 1931. Like the Monomail, a retractable tailwheel undercarriage was used. Two gunners, each armed with a single machine gun sat in nose and dorsal positions, while a radio operator sat inside the fuselage. The pilot and co-pilot sat in separate open cockpits, with the co-pilot, who doubled as the bombardier sitting forward of the pilot. Both aircraft were low winged cantilever monoplanes with a slim, oval cross-section fuselage accommodating a crew of five. The two aircraft differed only in the engines used, with the Model 214 to be powered by two liquid-cooled Curtiss V-1570-29 Conqueror engines while the Model 215 had two Pratt & Whitney R-1860 Hornet radial engines. Using its own money, Boeing decided to build two prototypes of its new bomber design as a private venture. The United States Army Air Corps bomber squadrons were largely equipped with slow biplanes such as the Keystone B-6, and Boeing decided to design and build a twin-engined bomber using the same techniques used in the Monomail to re-equip the Air Corps.
#Cleveland plans boeing model 94 mailplane skin#
The Monomail was of radical design for the time, being a semi-monocoque, stressed skin cantilever monoplane with a retractable undercarriage. In May 1930, Boeing had flown its Model 200 Monomail single-engined mailplane.
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