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The Boeing Model 15 was a United States single-seat open-cockpit biplane fighter aircraft of the 1920s, manufactured by the Boeing company. The Model 15 saw service with the United States Army Air Service (as the PW-9 series) and with the United States Navy as a carrier-based fighter (as the FB series). ==Design and development== The design of the Model 15 was based on studies of the Fokker D.VII, of which 142 were brought back to the U.S. for evaluation as part of the Armistice Agreement ending World War I. Many of the features were similar. The Model 15 had a fuselage of welded steel tubing braced with piano wire, while the tapered single bay wings were fabric on a wooden frame, with spruce and mahogany wing spars and three-ply wood ribs. Wing struts were changed from the normal wood used in Boeing designs to streamlined steel tubes. The landing gear had a straight axle, streamlined into a small chord wing.〔 The original engine was a Wright-Hispano, but when the liquid-cooled Curtiss D-12 became available the aircraft was redesigned, moving the radiator from the nose to a "tunnel" under the engine.〔 Along with some other minor design changes to the wings, the design was finalized on January 10, 1922.〔 The Army expressed interest in the new design, and agreed to provide armament, powerplants, and test the aircraft, while leaving Boeing the rights to the aircraft and design. The contract was signed on April 4, 1923〔 and the first prototype, designated ''XPW-9'' for "Experimental Pursuit, Water-cooled engine", flew on June 2, 1923.〔 The XPW-9 competed with the Curtiss Model 33 for contracts for a pursuit aircraft to replace the Thomas-Morse MB-3A in the United States Army Air Service.〔Bowers 1989, p.82.〕 Ultimately, both models were accepted; the Curtiss aircraft was designated PW-8 and the Model 15 PW-9. The Air Service preferred the PW-9, which outperformed the PW-8 in all performance aspects except speed, and was built on a more rugged and easier to maintain design, ordering 113 aircraft (only 25 PW-8s were procured).〔 A naval version was also developed, designated ''FB'', and 44 aircraft produced. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Boeing Model 15」の詳細全文を読む スポンサード リンク
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