And here is the only Soviet four-engined dive bomber ever proposed. This was about two weeks worth of work for me to replicate everything from the gun barbettes to the dive brakes (first try ever) to the exhaust pipes on each individual engine. Enjoy.

Features:

AG-1 - Nose .30 cal ShKAS machine guns
AG-2 - Dorsal .30 cal ShKAS machine guns
AG-3 - Ventral .30 cal ShKAS machine guns
VTOL Slider (down) - Retractable dive brakes
Camera 1 - Bomb sight. (Note: It is not accurate and is more for cosmetic reasons.)

History:
In April 1939, Andrei Tupolev was given the task of designing a fast, four-engine dive bomber that could evade fighters and flak by flying at high speeds at altitudes of 29,528 to 32,808 feet. It recieved the designation of ANT-57, or PB-4M-105. Although having four engines, it was much smaller than the long-range four-engined Petlyakov Pe-8 (TB-7) heavy bomber. In addition to the previous features, the ANT-57 was to have the following characteristics: a range of 3,107 to 3,728 miles, pressurized cabins for the crew because of the high altitudes at which it was to fly, and it also needed to be able to dive at high speeds, up to 559 mph. The armament consisted of six .30 cal ShKAS machine guns and a crew of three. The engines were four turbocharged Klimov M-105TK engines. It did not progress past the drawing board.

Gallery:

Three-view of ANT-57 (PB-4M-105)

Inboard profile of ANT-57

Size comparison of ANT-57 to Petlyakov Pe-8 (TB-7)

Size comparison of ANT-57 (PB-4M-105) to Heinkel He 177 Grief