▁and ▁new ▁nac elles ▁for ▁the ▁V K - 1 ▁engines , ▁and ▁the ▁fitting ▁of ▁D T - V 1 ▁and ▁D T - N 1 ▁tur rets , ▁replacing ▁those ▁of ▁the ▁' 1 4 0 ', ▁armed ▁with ▁ 2 ▁× ▁ 2 3 mm ▁can non ▁each . ▁Fl ight ▁testing ▁of ▁' 1 4 0 - R ' ▁comm enced ▁on ▁ 2 0 ▁October ▁at ▁a ▁spe cially ▁built ▁air field ▁near ▁the ▁GO Z - 1 ▁factory ▁at ▁B ork i , ▁( the ▁German ▁workers ▁were ▁not ▁admitted ▁to ▁ ▁Ty op ly y ▁Stan ▁for ▁security ▁reasons ), ▁where ▁four ▁fl ights ▁were ▁carried ▁out , ▁all ▁of ▁which ▁suffered ▁from ▁severe ▁v ibration ▁of ▁the ▁wings . ▁ ▁The ▁final ▁variant ▁of ▁' 1 4 0 ' ▁was ▁the ▁' 1 4 0 - B / R ', ▁which ▁was ▁a ▁reconna issance ▁bom ber , ▁power ed ▁by ▁the ▁same ▁engines ▁but ▁with ▁increased ▁weight ▁and ▁reduced ▁performance . ▁Design ▁work , ▁static ▁tests ▁and ▁construction ▁were ▁complete ▁and ▁ground ▁testing ▁of ▁the ▁aircraft ▁partially ▁completed ▁when ▁all ▁work ▁on ▁' 1 4 0 - R ' ▁and ▁' 1 4 0 - B / R ' ▁aircraft ▁was ▁terminated ▁by ▁the ▁Council ▁of ▁Minister s ' ▁directive ▁No . ▁ 2 4 7 4 - 9 7 4 ▁issued ▁on ▁ 1 8 ▁June ▁ 1 9 5 0 . ▁ ▁Vari ants ▁▁ 1 4 0 The ▁initial ▁prototype ▁tact