- 3 0 0 ▁was ▁designed ▁at ▁the ▁OK B - 3 0 0 ▁design ▁b ureau ▁led ▁by ▁Serge i ▁T um ans ky ▁in ▁the ▁late ▁ 1 9 5 0 s . ▁The ▁engine ▁was ▁originally ▁intended ▁for ▁the ▁T up ole v ▁Tu - 1 2 1 ▁high - alt itude ▁high - speed ▁cru ise ▁miss ile . ▁Due ▁to ▁a ▁lack ▁of ▁Soviet ▁resources ▁and ▁fund ing ▁the ▁engine ▁cas ing ▁was ▁mainly ▁steel , ▁and ▁in ▁areas ▁exposed ▁to ▁high ▁temper atures , ▁ 3 0 ▁mic rom et re ▁silver - pl ated ▁steel . ▁At ▁the ▁time , ▁the ▁USS R ▁did ▁not ▁have ▁the ▁resources ▁to ▁explo it ▁met als ▁such ▁as ▁tit an ium ▁or ▁other ▁allo ys ▁which ▁could ▁have ▁reduced ▁the ▁weight ▁of ▁the ▁engine . ▁The ▁Tu - 1 2 1 ▁was ▁later ▁can ce led , ▁but ▁its ▁basic ▁design ▁was ▁used ▁in ▁the ▁T up ole v ▁Tu - 1 2 3 ▁reconna issance ▁dr one . ▁ ▁Performance ▁The ▁maximum ▁thrust ▁was ▁ 7 , 5 0 0 ▁kil og rams ▁force ▁( 7 3 . 5   k N , ▁ 1 6 , 5 0 0   l bf ) ▁dry ▁and ▁▁ 1 1 , 2 0 0 ▁kil og rams ▁force ▁( 1 1 0   k N , ▁ 2 4 , 7 0 0   l bf ) ▁with ▁after burn er . ▁This ▁thrust ▁enabled ▁the ▁M iko yan