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The Boeing Model 81 was an American training aircraft built by Boeing in 1928. The Model 81 was a development of the Model 64. It was powered by a newly developed engine, the 125 hp 4-cylinder radial engine. Operating at a much lower rpm than most engines (1000 rpm) it required the use of a large high-pitch propeller.

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  • بوينغ طراز 81 (ar)
  • Boeing Model 81 (en)
  • Boeing Model 81 (es)
  • Boeing Model 81 (in)
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  • طائرة بوينغ طراز 81 طائرة تدريب أميركية بنيت من قبل شركة بوينغ في عام 1928. هي تطوير لطراز 64. استعملت المحرك المطور حديثا بقوة 125 حصان فيرتشايلد-كامينيز بأسطوانات محرك شعاعي. تبتشغيل في أقل دورة في الدقيقة من معظم محركات (1000 دورة في الدقيقة) المطلوب استخدامها بشكل كبير في الملعب المروحة. (ar)
  • El Boeing Model 81 fue un avión de entrenamiento estadounidense construido por Boeing en 1928. El Model 81 fue un desarrollo del Model 64. Estaba equipado con un motor recién desarrollado, el radial de 125 hp y cuatro cilindros.​ Operando a muchas menos rpm que la mayoría de los motores (1000 rpm), requería el uso de una gran hélice de elevado paso.​ (es)
  • Boeing Model 81 adalah pesawat latih Amerika dibangun oleh Boeing pada tahun 1928. Model 81 adalah pengembangan dari Model 64. Hal ini didukung oleh mesin baru yang dikembangkan, mesin radial 4-silinder 125 hp Fairchild-Caminez. Operasi pada rpm jauh lebih rendah daripada mesin yang paling tinggi (1000 rpm) dan memerlukan penggunaan baling-baling besar. (in)
  • The Boeing Model 81 was an American training aircraft built by Boeing in 1928. The Model 81 was a development of the Model 64. It was powered by a newly developed engine, the 125 hp 4-cylinder radial engine. Operating at a much lower rpm than most engines (1000 rpm) it required the use of a large high-pitch propeller. (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/Boeing_81B_with_Wright_J-6-5_installed_(side).jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Boeing_81_closeup_of_125_hp_Fairchild-Caminez_4-cylinder_radial_engine.jpg
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  • United States (en)
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  • Boeing School (en)
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  • Bowers, 1989. p. 144 (en)
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  • trainer (en)
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  • طائرة بوينغ طراز 81 طائرة تدريب أميركية بنيت من قبل شركة بوينغ في عام 1928. هي تطوير لطراز 64. استعملت المحرك المطور حديثا بقوة 125 حصان فيرتشايلد-كامينيز بأسطوانات محرك شعاعي. تبتشغيل في أقل دورة في الدقيقة من معظم محركات (1000 دورة في الدقيقة) المطلوب استخدامها بشكل كبير في الملعب المروحة. (ar)
  • The Boeing Model 81 was an American training aircraft built by Boeing in 1928. The Model 81 was a development of the Model 64. It was powered by a newly developed engine, the 125 hp 4-cylinder radial engine. Operating at a much lower rpm than most engines (1000 rpm) it required the use of a large high-pitch propeller. After initial flight tests with the Fairchild-Caminez, the prototype was refitted with a 145 hp Axelson engine, redesignated Model 81A and delivered to the Boeing School of Aeronautics. There, it was re-engined a number of times, first with a 115 hp Axelson engine, redesignated Model 81B. It then received a 165 hp Wright J-6-5, then a 100 hp Kinner K-5 and a redesigned vertical tail. Redesignated Model 81C, it would later be removed from training service, re-engined with an Axelson engine, and used as a classroom trainer. On 21 June 1928, the second Model 81 built was delivered to the US Navy at Anacostia, Maryland for $8,300, and redesignated Boeing XN2B. Its trial with the Fairchild engine was unsatisfactory, and on 10 January 1929 it was refitted by Wright Aeronautical with a 160 hp Wright J-6-5 engine. Despite increased performance, it was not ordered into production. (en)
  • El Boeing Model 81 fue un avión de entrenamiento estadounidense construido por Boeing en 1928. El Model 81 fue un desarrollo del Model 64. Estaba equipado con un motor recién desarrollado, el radial de 125 hp y cuatro cilindros.​ Operando a muchas menos rpm que la mayoría de los motores (1000 rpm), requería el uso de una gran hélice de elevado paso.​ (es)
  • Boeing Model 81 adalah pesawat latih Amerika dibangun oleh Boeing pada tahun 1928. Model 81 adalah pengembangan dari Model 64. Hal ini didukung oleh mesin baru yang dikembangkan, mesin radial 4-silinder 125 hp Fairchild-Caminez. Operasi pada rpm jauh lebih rendah daripada mesin yang paling tinggi (1000 rpm) dan memerlukan penggunaan baling-baling besar. (in)
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  • Fairchild-Caminez (en)
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