nato reporting cart soviet passenger variant bomber reverse engineered copy american boeing designed immediately end world war number components emergency landings soviet_union running fuel bombing japan fuselage soviet_union flew november aircraft successfully tested recommended serial production ultimately produced pressing military orders requirement aircraft design development basic design work completed bomber decided design passenger variant fuselage given internal designation intended use components possible reduce costs save development time low wing landing gear powered radial engines design work mock began february confirmed order single prototype following month production decision known testing speed construction prototype number components utilized included outer wing panels engine flaps tail assembly internal equipment wing center section redesigned span increased fuselage entirely new changed wing position mid wing low wing aircraft changed conventional stepped configuration different configurations proposed cabin layout government version mixed class passenger model configuration seats prototype appears built mixed class configuration confirmed completed october flight november began manufacturer trials october engine fire fourth flight caused crash landing traced design defect american built control system identifying problem fixing prolonged manufacturer trials october redesignated went state acceptance trials ended december met design goals accepted production factories committed building aircraft higher priority requirement type fully satisfied existing sent russian scientific research institute evaluation military transport aircraft december afterward variety tests scrapped design modified military transport placed production specifications data general characteristics crew capacity passengers length wingspan height wing area weight loaded weight max takeoff weight powerplant radial engines performance maximum speed mph range nmi service ceiling wing loading power mass
Tupolev Tu-70