Su-4 attack bomber

The plane of the USSR of the Second World War Su-4 was a modification of the Su-2 bomber. The car was equipped with another engine and improved weapons. According to some reports, this aircraft fought in World War II, according to others, the Su-4 source with the AM-90 engine was in the experimental stage, but in all probability, it passed the test.

 The Su-4 was actually a modification of the Su-2 bomber with a more powerful engine. In addition, this attack bomber had more effective weapons – large-caliber guns were installed instead of conventional machine guns. In the book “History of the construction of aircraft of the USSR 1938-50.” B. B. Shavrov writes that at first it was planned to install the M-90 engine of E.V. Urmin, which was a two-row, star-shaped, 18-cylinder, much smaller diameter than other star-shaped engines.

In order not to get confused in modifications and engines, you can always hover over the image to read the name of the aircraft in this article.

Sukhoi believed that since the fall of 1941, serial production of the Su-2 could be transferred to the M-89 engine, which was created under the leadership of S.K. Tumansky and then E.V. Urbina. But, according to Pavel Osipovich, the engine of A.D. had many more advantages in-flight characteristics. Shvetsova M-82 – further development of the M-81. As promising engines, the M-90 and AM-37 were considered – under them, the chief designer from February 1941 began to design and build experimental Su-4 (BB-3) machines. Unlike the Su-2, they had to have not only a wooden fuselage but also a wooden wing with metal spars. It was planned that Taubin’s heavy machine guns would replace the ShKASs in the wings and on the upper turret.

Since the M-90 did not leave the experimental stage, the serial M-82 was installed on the machine. The wing consoles were made with the same metal spars with wooden ribs and plywood sheathing due to lack of duralumin. The armament of the Su-4 World War II USSR aircraft compared to the Su-2 bomber was more powerful – two large-caliber BS machine guns in the center section with the same two ShKAS machine guns at the shooter and 400 kg of bombs on the internal suspension. The plane gained a height of 6 thousand meters in 10.5 minutes, and the speed at the ground was 450 km / h. The aircraft underwent state tests in April 1942. The Su-4 aircraft was mass-produced and fought in the Great Patriotic War.

Nevertheless, the Su-4 was still tested with the M-90. There is information on the Internet that factory No. 289 manufactured a wing and a set of drawings for the Su-4 AM-37 aircraft and transmitted them to factory No. 135 in accordance with the departmental order of March 4, 1941. In July 1941, by order of the NKAP, all work on the aircraft was assigned to Plant No. 289. In October 1941, unfinished Su-4 M-90 and Su-4 AM-37 aircraft were evacuated to Molotov. By order of the NKAP in the summer of 1942, a fully finished Su-4 M-90 aircraft was handed over to Plant No. 29 evacuated to the city of Omsk for flight tests of the M-90. According to reports of the Air Force Research Institute, by April 15, 1943, the aircraft completed 9 flights with a raid of 4 hours 30 minutes. No evacuation work was carried out on the Su-4 AM-37 aircraft and in connection with the termination of the serial production of the Su-2 aircraft, a petition was filed before the People’s Commissar to remove this task from the plant’s plan.

The process of improving the Su-2 short-range bomber was not limited only to the above modifications. There were also unrealized projects. In a government decree of July 29, 1939, “On the creation of modified and new experienced bombers, attack aircraft and reconnaissance aircraft in 1939,” prescribed P.O. Sukhom “… To develop a conceptual design of a single-engine twin-seat bomber as a further development of the BB-1 and present it in NGO in July 1939 … “


  • Engine type 1 PD Shvetsov M-82
  • Horsepower 1 x 1250
  • Length, m 10.79
  • Wingspan, m 14.30
  • Wing Area, sq.m 29.00
  • Weight kg
  • fuel and oil 525
  • flight 4620
  • Speed km / h
  • near the ground 450
  • at an altitude of 486
  • landing 135
  • Climbing time 5 km, min. 10.5
  • Range, km 1000
  • Practical ceiling, m 9500
Graduated from Embry-Riddle Aviation University with a master's degree in aviation science. He began his career as an aviation researcher in local periodicals. Has a pilot license. Now are the author and developer of the Plane Worlds.