▁prototype , ▁power ed ▁by ▁two ▁ ▁B MW ▁VI ▁V - 1 2 ▁engines . ▁R - 6 ( R ▁– ▁Raz vy ed ch ik ▁– ▁reconna issance ) ▁reconna issance ▁version , ▁power ed ▁by ▁two ▁ ▁Mik ul in ▁M - 1 7 F ▁V - 1 2 ▁engines . ▁first ▁flight ▁ 1 9 2 9 , ▁tri als ▁ 1 9 3 0 . ▁K R - 6 ( K R ▁– ▁Kre iser ▁Raz vy ed ch ik ▁– ▁cru iser ▁reconna issance ) ▁esc ort ▁f ighter ▁version ▁ 1 9 3 4 , ▁power ed ▁by ▁two ▁ ▁Mik ul in ▁M - 1 7 ▁V - 1 2 ▁engines , ▁fitted ▁with ▁two ▁P V - 2 ▁machine ▁guns ▁and ▁a ▁second ▁gun ner . ▁K R - 6 P Al tern ative ▁design ation ▁of ▁the ▁MR - 6 ▁float plane ▁version . ▁MP - 6 ▁ 2 M - 1 7 ( Mor sk oj ▁Pa ass az h ir sk ii ▁– ▁se ap lane ▁passenger ▁transport ) ▁Civil ▁float plane ▁version , ▁power ed ▁by ▁two ▁ ▁Mik ul in ▁M - 1 7 ▁V - 1 2 ▁engines .. ▁PS - 7 ▁ 2 M - 1 7 ( Pa ass az h ir sk ii ▁– ▁passenger ▁transport ) ▁Civil ▁transport ▁version ▁PS - 7 ▁ 2 M - 1 7 , ▁cargo ▁and ▁passenger ▁transport , ▁first ▁versions ▁open ▁co ck pit , ▁one ▁version ▁en