Armoured attack aircraft BS-2 (CKB-55)
In connection with the unsuccessful Spanish experience with the combat use of reconnaissance aircraft and fighters for direct air support of troops in conditions of strong enemy air defence, on 16 December 1937 the chief of armament and material - technical supply of the VVS KA in the creation of a plan of experimental aircraft design for 1938 and experts - military engineer 1. P.A. Losyukov and P.V. Rudintsev, a military engineer of the 2nd degree, raised with all their sharpness the question of the immediate inclusion in the plan of the construction of a special attack aircraft, "... operating at low altitude and possessing powerful offensive and defensive weapons and with an engine that develops maximum power near the ground ..."