The Boeing NB (or Model 21) was a primary training aircraft developed for the United States Navy in 1923. It was a two-bay, equal-span biplane of conventional configuration with interchangeable wheeled and float undercarriage. The pilot and instructor sat in tandem, open cockpits.
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| - بوينغ أن بي (ar)
- Boeing NB (en)
- Boeing NB (es)
- Boeing NB (in)
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| - طائرة بوينغ NB (أو طراز 21) هي طائرة تدريب متقدمة طورت لخدمة البحرية الأميركية في عام 1923. كانت مصممة من برجين، ذو جناحين مسطحين بتصميم تقليدي عجلات متبادلة وجنازير تحت جسم الطائرة. يجلس المدرب والمتدرب في قمرتين خلف بعضهما. (ar)
- El Boeing NB (o Model 21) fue un avión de entrenamiento primario desarrollado para la Armada de los Estados Unidos en 1923. (es)
- The Boeing NB (or Model 21) was a primary training aircraft developed for the United States Navy in 1923. It was a two-bay, equal-span biplane of conventional configuration with interchangeable wheeled and float undercarriage. The pilot and instructor sat in tandem, open cockpits. (en)
- Boeing NB (atau Model 21) adalah pesawat pelatihan utama dikembangkan untuk Angkatan Laut Amerika Serikat pada tahun 1923. Pesawat pelatihan itu dua-bay, biplan konfigurasi konvensional dengan dipertukarkan roda dan undercarriage mengapung. Para pilot dan instruktur duduk bersama-sama, cockpit terbuka. (in)
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| - طائرة بوينغ NB (أو طراز 21) هي طائرة تدريب متقدمة طورت لخدمة البحرية الأميركية في عام 1923. كانت مصممة من برجين، ذو جناحين مسطحين بتصميم تقليدي عجلات متبادلة وجنازير تحت جسم الطائرة. يجلس المدرب والمتدرب في قمرتين خلف بعضهما. (ar)
- The Boeing NB (or Model 21) was a primary training aircraft developed for the United States Navy in 1923. It was a two-bay, equal-span biplane of conventional configuration with interchangeable wheeled and float undercarriage. The pilot and instructor sat in tandem, open cockpits. The NBs were produced in two batches; the first (NB-1) were powered by radial engines and the second by war-surplus V-8s still in the Navy's inventory. The original prototype evaluated by the Navy had been assessed as being too easy to fly, and therefore of limited use as a trainer. In particular, it was noted that the aircraft was impossible to spin. The NB-1 design attempted to introduce some instability, but it was soon discovered that while it was now possible to get the aircraft into a spin, it was virtually impossible to recover from one. A series of modifications were made to attempt a compromise. (en)
- El Boeing NB (o Model 21) fue un avión de entrenamiento primario desarrollado para la Armada de los Estados Unidos en 1923. (es)
- Boeing NB (atau Model 21) adalah pesawat pelatihan utama dikembangkan untuk Angkatan Laut Amerika Serikat pada tahun 1923. Pesawat pelatihan itu dua-bay, biplan konfigurasi konvensional dengan dipertukarkan roda dan undercarriage mengapung. Para pilot dan instruktur duduk bersama-sama, cockpit terbuka. Para NB diproduksi dalam dua batch, yang pertama (NB-1) yang didukung oleh mesin radial dan yang kedua oleh perang-Surplus Vee-8 masih dalam persediaan Angkatan Laut. Prototipe asli dievaluasi oleh Angkatan Laut telah dinilai sebagai terlalu mudah untuk terbang, dan oleh karena itu penggunaan terbatas sebagai pesawat pelatihan. (in)
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