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Tupolev I-4The Tupolev I-4 (Development name ANT-5) was a Soviet fighter biplane. It was the first aircraft designed by Pavel Sukhoi. ANT-5 was a prototype of I-4 sesquiplane single-seat fighter. I-4 differed from ANT-5 by redesigned (to decrease drag) engine howling, added rocket launchers on upper wing and increased tailfin. The lower wing was nothing more than an attachment for the wing struts; it was (almost) removed in the second series (I-4bis), used as a parasite fighter in Zveno experiments with TB-3 bomber. The I-4 was the first Soviet all metal fighter. One 480hp M-22 engine. Total 369 were built. In service in 1928-1933. Development of 1927. External links: http://www.aviation.ru/Tu/#ANT-5
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