According vserasprostranennoy while the theory, the presence of the triplex could fully cover the entire available range of tasks army division-level. For the development of all 3 systems meet the Bureau of Plant an experienced Mechanical Engineering. Kirov (plant number 185) under PN Syachentova and S. Ginsburg. Responsible designer of this project was named V. Moskvin.
As a basic chassis for ACS was elected as a light tank T-26 mod. 1933, the creation of which was established in Leningrad. Due to the fact that the existing tank assembly is not suited to the ACS, Building T-26 has been revised significantly.
Separation of management together with controls ACS, the seat of the driver, as elements of the box left on their own place in the nose machine. But the engine compartment had to be moved to the center of the body, separating it from other self-propelled armored compartment divider. In the engine compartment contained a standard internal combustion engine of the T-26, 90 hp, the main clutch, shortened driveshaft, radiator, fan, oil and fuel tanks, which were broken hermetic Partitions. Engine compartment SPG SU-5 has been linked with a special pocket with side holes that served to discharge cooling air. On the roof of the engine department there were two hatches for access to the candle, carburetor, valves and oil filter, and holes with armored shutters that were used for the cooling air.
The fighting compartment is in the rear of the vehicle. There is a 15-mm self-propelled guns broneschitom housed weapons and locations for the calculation (4 people). To dampen the recoil while firing at the ground sank a special share, located in the rear of the vehicle. In this might apply more side supports.
Chassis did not undergo configurations in comparison with the serial tank T-26. For each of the sides of it consisted of the following components: 8 rollers, which were collected in 4 carts (first and 2-aya/3-ya and fourth carts had a total suspension with shock absorbers on the leaf springs), 4 idlers. The steering wheel is back, leading a frontal.
All three ACS has a single chassis and different, priemuschestvenno applicable weapons:
1. The main armament SPG SU-5-1 was 76.2 mm divisional gun model. 1902/30 years. (The length of the barrel 30 gauge). The initial velocity of the projectile — 338 m / s. Vertical angles pointing guns ranged from -5 to +60 degrees horizontal — 30 degrees in the sector, without turning the unit casing. The delivery of fire calculation used telescopic sight and a panorama of Hertz. Most firing range was 8,760 meters with an elevation angle of 40 degrees guns. Rate of guns made 12 shots per minute. Shooting was carried from place without the use of openers with lowered Polikey loader. Ammunition ACS consisted of 8 shots.
2. The main armament SPG SU-5-2 was 122 mm howitzer obr.1910/30 years. (12.8 caliber barrel length), which is a modified design of different cradles. The initial velocity of the projectile was equal to 335.3 m / s. Pointing angles in the vertical plane varied from 0 to 60 degrees to the horizontal — 30 degrees without turning the unit casing. The delivery of fire calculation used telescopic sight and a panorama of Hertz. Most firing range was 7,680 meters use a piston valve provided decency rate of 5-6 rounds per minute. Shooting was carried from place without the use of openers with lowered Polikey loader. Ammunition consisted of 4 and 6 of the projectile charge.
3. The main armament SPG SU-5-3 was 152.4 mm mortar divisional arr. 1931 (9.3 caliber barrel length). The initial velocity of the projectile — 250 m / s. Pointing angles in the vertical plane varied from 0 to 72 degrees, pointing angles in the horizontal plane — 12 degrees without turning the unit casing. When firing the calculation used the panorama of Hertz. Most firing range was 5,285 meters. The use of wedges provided a rate of 4-5 rounds per minute at elevations of up to 30 degrees and 1-1.5 shot at elevations above 30 degrees. Ammunition consisted of 4 rounds. When used in the conduct of fire 2 plowshares, which were installed on the outside aft ACS.
For the transport to the SPG SU-5 munitions on the battlefield was supposed to use a special armored Ammunition.
Combat weight SPG SU-5 ranged from 10.2 to 10.5 tons depending on the modification. The crew consisted of ACS and 5 persons (driver and 4 crew members). Fuel capacity of 182 liters was enough to make 170 km. march on the highway.
The fate of the project
Factory testing of all 3 cars were laminated from 1 October to 29 December 1935. Total ACS were: SU-5-1 — 296 km., SU-5-2 — 206 km., SU-5-3 — 189 km., With all this last November 1, 1935 has been sent to the parade in the capital. In addition to running car and experienced shooting SPG SU-5-1 and SU-5-2 produced by 50 shots, SPG SU-5-3 produced 23 shots.
The results of the tests were made following conclusions: "ACS different tactical mobility, which allows them to move on the roads and out of the transition to the firing position for the 76 and 122 mm SS-5 is instant for 152-mm version takes 2-3 Minutka (because the shooting involves the introduction of stops). During the tests revealed shortcomings and machines that carried: the lack of strength of the bracket, which connected the cradle to the trunnion collar, bandages and feeble support wheels. All identified deficiencies had fundamentally meaning and simply eliminated.
According to the plans in 1936 was supposed to make a batch of 30 self-propelled guns SU-5. In this case, the military favored version of the SU-5-2 with a 122-mm howitzer. From the SU-5-1, they shall be removed in favor of an artillery tank AT-1, and 152-mm mortars chassis SU-5-3 was pretty feeble. First 10 production cars were ready by the summer of 1936. Two of them were almost immediately sent back to the 7th Mechanized Corps to undergo military trials, which lasted from June 25 to Jul
y 20, 1936 and passed in Luga. During the test machines have their own power 988 and 1014 km. respectively, producing 100 shots any.
The results of the military tests found that the SPG SU-5-2 troop tests passed. SU-5-2 were quite mobile and high during the campaign, having a sufficient maneuverability and good stability in the management of the fire. Usually, SAU used for firing from open positions, serving as artillery support. If you make a number of additions to their design data to make better self-propelled armament mechanized units, in particular as a means of artillery support.
To the main shortcomings identified by the machine carried: the missing ammunition, its proposed increment up to 10 rounds. Also proposed increment horsepower because ACS was overloaded and strengthen springs. Silencer offered to move to another location, and the separation of management to equip fan.
Some of these prirekany military was eliminated in the process of production of the remaining 20 self-propelled guns, but to increase and strengthen the capacity of the motor suspension and failed. A number of recent cars that were produced in autumn 1936, also received additional armored plates that covered the gunner's seat on the sides. Proposed changes in the structure of SPG SU-5 configuration and the results of military trials, then start their batch creation, but instead of this, in 1937, work on the program there "small triplex" were completely collapsed. Maybe it was connected with the arrest of one of the designers of the first PN Syachentova.
ACS already made from the first batch entered service mechanized corps and brigades of the Red Army. In the summer of 1938 these machines have even taken part in the fighting against the Japanese at Lake Khasan. SS5 acted in the nameless heights in the Zaozernaya and artillery batteries from the 2nd Mechanized Brigade Special Far Eastern Army. Because of the short duration of the hostilities that have ended 11 August 1938, the use of self-propelled guns was of a very limited nature. Despite this, in reporting indicated that the ACS provided substantial support to the infantry and tanks.
In September 1939, during the "liberation" campaign in Western Belarus and Ukraine, the battery SU-5, which was part of the 32nd Armored Brigade made the 350-km march, but in engagements with Polish troops did not participate. After a march of one unit was sent to the factory for the passage of the overhaul.
As of June 1, 1941 as part of the Red Army, there were 28 self-propelled guns SU-5: 8, especially in the West, and 9 in the Kiev area especially the military, 11 on the Far Eastern front. Of them properly was only 16 cars. Some information about using the ACS data into a sublime Russian war has yet been found. They are all likely to have been abandoned due to defective or lost in the first week of fighting.
Tactical and technical characteristics: SU-5-2
Weight: 10.5 tons
Length 4.84 m, width 2.44 m, height 2.56 m
Crew: 5 people.
Reservations: 6 to 15 mm.
Armament122-mm howitzer obr.1910/30 years
Ammunition: 10 rounds
Engine: in-line 4-cylinder carburetor air cooling of the T-26 90 hp
The highest speed: on the highway — 30 km / h
Progress in store: on the highway — 170 km.