More than 50 different modifications and experimental vehicles based on the T-26 light infantry tank chassis were developed in the USSR in the 1930s, with 23 modifications going into series production. The majority were armoured combat vehicles: flame tanks, artillery tractors, radio-controlled tanks (teletanks), military engineering vehicles, self-propelled guns and armoured personnel carriers. They were developed at the Leningrad Factory of Experimental Mechanical Engineering (from 1935 known as the Factory No. 185 named after S.M. Kirov) by talented Soviet engineers P.N. Syachentov, S.A. Ginzburg, L.S. Troyanov, N.V. Tseits, B.A. Andryhevich, M.P. Zigel and others. Many Soviet tank engineers were declared "enemies of the nation" and repressed during Stalin's Great Purge from the middle of the 1930s. As a result, work on self-propelled guns and armoured carriers ceased in the USSR during that time. T-26 light tanks were also modified into armoured combat vehicles in the field during wartime.
Flame-throwing tanks formed around 12 per cent of the series production of T-26 light tanks. [1] It should be mentioned that the abbreviation "OT" (Ognemetniy Tank which stands for Flame-throwing Tank) appeared only in post-war literature; these tanks were originally called "KhT" (Khimicheskiy Tank which stands for Chemical Tank), or BKhM (Boevaya Khimicheskaya Mashina; Fighting Chemical Vehicle) in the documents of the 1930s. All chemical (flame-throwing) tanks based on the T-26 chassis (KhT-26, KhT-130, KhT-133) were designated BKhM-3. The vehicles were intended for area chemical contamination, smoke screens and for flame-throwing.
The TKhP-3 chemical equipment for smoke screens and chemical contamination was developed in 1932. This equipment could be easily installed on any T-26 light tank and was produced by the "Compressor" Factory, (introduced for smoke screening as the TDP-3 from summer 1934; 1,503 such sets were produced to the end of 1936). [1]
Additional variants of the ST-26 (with a sliding system of bridge laying and with a tipping system of bridge laying) were also tested from 1932. The first had a massive guide frame and a special boom (the bridge could be laid in 3 min 20 sec, the raise operation took 6-7 min), while the second was equipped with a special swinging-boom with a rack-and-pinion drive. All three variants of the ST-26 participated in military maneuvers of the Leningrad Military District in the summer of 1933; subsequently series production of the ST-26 with a cable system of bridge laying was begun as it proved to be more reliable and less complicated to maintain. The Defence Committee of the USSR ordered the production of 100 ST-26 to the end of 1933, but only 44 vehicles were assembled by the Factory No. 174 by 1934, and 20 in 1935. The delay was attributed to the manufacture of the metal bridges, carried out by the Gipstalmost Factory and several workshops using semi-handicraft techniques.
Specifications: weight - 9.5–10 tonnes (10.5–11.0 short tons); crew - 2 men (commander and driver); speed - 28 km/h (17 mph); range - 120 km (75 mi).
The Armoured Engineering Section of the Red Army's Research Institute of Engineer Equipment (NIIIT RKKA) in co-operation with the Gipstalmost Factory developed an improved engineer tank at the end of 1936, with a lever hydraulic system of bridge laying (similar to the UST-26, see below) and a small turret of new design. The bridge could be laid in 45 sec and the raise operation took 1.5 min (both processes did not require crew exit). The vehicle was assembled by the Podolsk Machine Factory named after S. Ordzhonikidze in July 1937, and was successfully tested at the NIIIT Proving Ground (85 bridge layings were performed and 70 light tanks passed over the bridge). This ST-26 prototype was also tested at the Kubinka Tank Proving Ground, and participated in military exercises of the Leningrad Military District in 1938. A decision was made in 1939 to produce a batch of engineer tanks with the lever hydraulic system, but the Podolsk Machine Factory could assemble only one. The Stalingrad Tractor Factory probably also produced two such vehicles the same year.
An experimental multispan bridge was developed in 1934 which allowed for the coupling together of three or more ST-26 bridges, using special automatic grips in the end of each bridge section. The multispan bridge employed 250 kg metal columns 2.5 m (8.2 ft) high and was intended for crossings by T-26 and BT light tanks of water obstacles up to 20–50 m (66–164 ft) wide and 3 m (9.8 ft) deep. The launching of each bridge section took 20-30 min. The bridge had no development after testing.
Engineer Alexandrov from the Research and Technology Division of the Red Army's Engineer Directorate (NTO UNI RKKA) developed a wooden tracked bridge 6.5 m (21 ft) long. The bridge was mounted on standard T-26 light tanks as well as on ST-26 engineer tanks and could be laid in 30-60 sec without crew exit. Trials carried out in July–August 1934 were successful and 20 such bridges were issued to the armed forces.
Seventy-one ST-26 engineer tanks were produced in 1932–1939, including experimental vehicles: 65 ST-26 with a cable-laid bridge system, 1 ST-26 with a sliding bridge, 1 ST-26 with a tipping bridge, 2 UST-26 and 2 ST-26 with a levered bridge-laying system.
Ten ST-26 engineer tanks were used on the Karelian Isthmus during the Winter War (9 with a cable system and 1 with a lever system); they were included in engineer groups for obstacle clearing that were established in each tank brigade during the war. Three ST-26 tanks of the 35th Light Tank Brigade had the most success (in particular they launched two bridges over a trench and then an antitank ditch for a tank battalion during an assault on the fortified High Point 65.5 (Hottinen area) of the Mannerheim Line on February 18, 1940). The ST-26 with the lever system of bridge laying demonstrated good results and that vehicle was used quite actively during the Winter War, while tanks with the cable system were less reliable and had limited use. There were no losses of ST-26 engineer tanks during the Winter War.
Tank units of the Red Army had 57 ST-26 engineer tanks on June 1, 1941: 9 in the Far Eastern Front, 26 in the Moscow Military District, 2 in the Leningrad Military District, 2 in the Kiev Special Military District, 8 in the Western Special Military District, 1 in the Volga Military District, and 9 vehicles were in military supply depots. From those ST-26 engineer tanks only 12 were in good order, the others required repair.
Specifications: weight - 7.77–8.1 tonnes (8.56–8.93 short tons); crew - 1 (driver) + 4-5 (gun crew or landing party); armour - 6–15 mm (0.24–0.59 in); speed - 28 km/h (17 mph), 15 km/h (9.3 mph) with a 5-t trailer; range - 120 km (75 mi) with a 5-t trailer.
One hundred and eighty three T-26T were produced in 1933. Fourteen more with a high-powered engine and improved towing device were produced in 1936 (including 10 with an armoured cabin). The manufacturer was the Factory No. 174 named after K.E. Voroshilov in Leningrad (a plan to produce 200 T-26T with a canvas cover and 150 T-26T with an armoured cabin annually was not carried out due to increases in tank production). Tests and army service showed that T-26T artillery tractors were underpowered for cross-country towing of trailers weighing more than 5 tonnes (5.5 short tons), so these vehicles had no further development. Also around 20 T-26 light tanks of early models were converted into artillery tractors by army units in 1937–1939. A transfer of overhauled old twin-turreted T-26 tanks (without turrets and armament) from some tank units of western military districts for use as artillery tractors for anti-tank and regimental guns in mechanized corps began in May 1941.
Tank and mechanized infantry units of the Red Army had 211 artillery tractors based on the T-26 chassis on June 1, 1941. Almost all T-26T artillery tractors of border and some inner military districts were lost during the first weeks of the Great Patriotic War. A few remained in front-line service until 1942 at least (for example, the 150th Tank Brigade of the Bryansk Front had a T-26T with an armoured cabin on May 15, 1942, which was used as a command vehicle).
No less than 50 old twin-turreted T-26 tanks of the Transbaikal Military District were converted into artillery tractors from 1941; these vehicles participated in combat with the Japanese Kwantung Army in August 1945. [10]
Specifications: full weight - 9.445 tonnes (10.411 short tons); crew - 2 (driver and commander) + 14 men (landing party); armour - 4–10 mm (0.16–0.39 in).
Around 1,701 armoured combat vehicles based on the T-26 chassis were produced in the USSR from 1932 till 1941.
1932 | 1933 | 1934 | 1935 | 1936 | 1937 | 1938 | 1939 | 1940 | 1941 | Total | |
---|---|---|---|---|---|---|---|---|---|---|---|
KhT-26 | 91 | 106 | 430 | 7 | - | - | - | - | - | - | 552 |
KhT-130 | - | - | - | - | 10 | - | 290 | 101 | - | - | 401 |
KhT-133 | - | - | - | - | - | - | - | 42 | 265 | - | 269 |
KhT-134 | - | - | - | - | - | - | - | - | 2 | - | 2 |
ST-26 | 3 | - | 44 | 20 | 2 | 1 | - | 1 | - | - | 71 |
TT-26 and TU-263 | - | 33 | - | - | 74 | - | 55 | - | - | - | 162 |
SU-5 | - | - | - | 34 | 30 | - | - | - | - | - | 33 |
T-26T | - | 183 | - | - | 14 | - | - | - | - | - | 197 |
SU-26 | - | - | - | - | - | - | - | - | - | 145 | 14 |
Many different attached implements for the T-26 light tank were developed in the USSR in the 1930s. Among these were mine sweeps, equipment for swimming, snorkels for deep fording, wooden and brushwood fascines for trench crossing, special extra-wide swamp tracks and mats, wire cutters, dozer blades and many others. All of them were tested but despite often excellent test results none (except some mine sweeps) passed into army service.
Design work started again when the Winter War began: Leningrad factories Kirov Factory, Factory No. 185 and Factory No. 174 developed new models of mine sweeps for the T-26 and T-28 tanks in December 1939. Kirov Factory produced 93 new mine sweeps and Factory No. 174 produced an additional 49. These disc mine sweeps (metal discs 700–900 mm in diameter with a thickness of 10–25 mm on a common axis; the weight of the whole construction was 1,800-3,000 kg) were issued to army field forces in February and March 1940. Despite low explosion resistance (the discs would bend after the first mine explosion), these mine sweeps were used successfully by the 35th tank brigade and tank battalions of the 8th Army during the Winter War.
An armoured fighting vehicle or armored fighting vehicle (AFV) is an armed combat vehicle protected by armour, generally combining operational mobility with offensive and defensive capabilities. AFVs can be wheeled or tracked. Examples of AFVs are tanks, armoured cars, assault guns, self-propelled artilleries, infantry fighting vehicles (IFV), and armoured personnel carriers (APC).
A military engineering vehicle is a vehicle built for construction work or for the transportation of combat engineers on the battlefield. These vehicles may be modified civilian equipment or purpose-built military vehicles. The first appearance of such vehicles coincided with the appearance of the first tanks, these vehicles were modified Mark V tanks for bridging and mine clearance. Modern military engineering vehicles are expected to fulfill numerous roles such as; bulldozer, crane, grader, excavator, dump truck, breaching vehicle, bridging vehicle, military ferry, amphibious crossing vehicle, and combat engineer section carrier.
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The T-26 tank was a Soviet light tank used during many conflicts of the Interwar period and in World War II. It was a development of the British Vickers 6-Ton tank and was one of the most successful tank designs of the 1930s until its light armour became vulnerable to newer anti-tank guns. It was produced in greater numbers than any other tank of the period, with more than 11,000 units manufactured giving it the title of the most produced tank during the interwar period. During the 1930s, the USSR developed 53 variants of the T-26, including flame-throwing tanks, combat engineer vehicles, remotely controlled tanks, self-propelled guns, artillery tractors, and armoured carriers. Twenty-three of these were series-produced, others were experimental models.
The T-28 was a Soviet multi-turreted medium tank. The prototype was completed in 1931, and production began in late 1932. It was an infantry support tank intended to break through fortified defences. The T-28 was designed to complement the heavier T-35, with which it shared turret designs. The type did not have great success in combat, but it played an important role as a development project for Soviet tank designers. A series of new ideas and solutions that were tried out on the T-28 were later incorporated in future models.
The T-35 was a Soviet multi-turreted heavy tank of the interwar period and early Second World War that saw limited service with the Red Army. Often called a land battleship, it was the only five-turreted heavy tank in the world to reach production, but proved to be slow and mechanically unreliable. Most of the T-35 tanks still operational at the time of Operation Barbarossa were lost due to mechanical failure rather than enemy action. It was designed to complement the contemporary T-28 medium tank; however, very few were built.
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Though nearly obsolete by the beginning of World War II, the T-26 was the most important tank of the Spanish Civil War and played a significant role during the Battle of Lake Khasan in 1938 as well as in the Winter War. The T-26 was the most numerous tank in the Red Army's armoured force during the German invasion of the Soviet Union in June 1941. The Soviet T-26 light tanks last saw combat in August 1945, in Manchuria.