The '140' was a reconnaissance/bomber aircraft, derived from the OKB-1 EF 131 with Soviet turbojet engines. The initial version, a tactical jet bomber with a secondary reconnaissance role, was initiated as the EF-140 by Dr. Brunolf Baade, at OKB-1, in 1947. The six Jumo 004 engines of the EF-131 were replaced by two Mikulin AM-TKRD-01 axial flow turbojets, rated at 32.372 kN (7,280 lb) thrust, in large nacelles attached to the underside of the wing at the same position.[1] Using the airframe of the second EF-131 prototype, the '140' was very similar in appearance, and to its forebear Junkers Ju 287, with the classic Junkers-style crew compartment in the nose, wings swept forward 19°50' with marked dihedral, and the underslung engine nacelles extending forward of the leading-edge. Construction was of aluminium alloy stressed skin, with a semi-monocoque fuselage, wings with multiple spars covered with stressed skin panels, and high strength steel for highly stressed parts. Defensive armament consisted of VDB-6 dorsal and NDB-1M ventral remotely controlled turrets controlled by the gunner, in the rear of the crew compartment, using upper and lower periscopes.