A) 1was Sikorsky Igor Ivanovich a wellknown aircraft engineer and manufacturer. 2was igor the first to make experiments in helicopter design. 3 did Sikorsky become an American citizen in 1928. 4 did tupolev work as the head of design bureau. b)where was sikorsky born. where did igor produce the first successful helicopter. when was tupolev born. what did tupolev design. c)did sikorsky or tupolev design the first russian wind tunnel. d)During his career he directed the design of more than 100 military and commercial aircraft, including the TU-2 and TU-4 bombers used in the World War II, didn't he
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