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Russian BT Tanks and their variants


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Russian BT Tanks

Source: "Soviet Tanks and Combat Vehicles of World War Two" - (Steven J.Zalogo and James Grandsen)

The companion of the T26 was the BT series of "fast" tanks. The T26 was employed promarily by tank units assigned to the support of infantry, while the BT was assigned to independent tank brigades and in support of cavalry formations. The BT series was based on the American Christie M1930 convertible tank. Convertible tank were a fad of the 1930's prompted by the lack of reliable tank tracks. Tracks had a short running-life, and were a primary source of the mechanical breakdowns which afflicted early tank units. The convertible tank skirted thye problem by making it possible to remove the tracks and run the tank on its roadwheels. This was accomplished by providing a sepcial chain drive to power the rear road wheels while in the wheeled mode. In this fasion, the tanks could be moved at high speed over roads with no wear on their tracks, and the tankconverted to provide cross-country mobility once the battlefield was reached; it took about 30 minutes to change a Christie from track to wheel mode.
The two M1930 p[rototypes arrived in the USSR early in 1931, having be shipped from the USA under the guise of agricultural tractors. They were turned over to a new design team at the Kharkov Locomotive Works (Komintern),(KhPZ nr.183) which was already preparing for production on the basis of angineering drawings already sent by Christie.On 23 May 1931, the RVS accepted the new tank for RKKA use as the BT-2 although not even a single prototype had been completed. The BT-1 designation was applied to the American prototypes. The Christie prototypes had arrived without turrets, so the main design change involved the development of turrets and armament combinations. The first three BT-2 prototypes were completed without armament in October and took part in the Moscow parade on 7 November 1931. After trials, KhPZ gegan quantity production of the BT-2 in 1932, manufacturing 396 tanks that year.There were two variants of the BT-2 Model 1932, on armed with a 37mm Model 1930 gun and the other armed with machine-guns. Both vehicles had a DT machine-gun mounted i a ball socket to the right of the m antlet, so the machine-gun armed variant had a total of theree DT machine-guns.The machine-gun variant was not popularly received and subsequent production turned antirely to gun-armed types.


Combat History

BT-5's were first used in action during the Spanish Civil War in 1936 when they fought on the Republican side against the Nationalists. BT's made up part of the large 500 stroke tank force under General Zhukov which took part in the influential battle of Nomonhan against the Japanese over the disputed area between Mongolia and Manchuria in August 1939. They participated in the carve up of Poland (in league with the Germans), and the invasion of Finland the same year.
Used to help try and stem the German advance into the USSR during the German onslaught in 1941, many were dug in and used as fixed pill boxes when they ran out of fuel or broke down and couldn't be repaired due to the poor logistics of the Red Army at the time. Whilst they only had thin armour their gun was a very potent weapon when they were first built.


Information from Alexander Kolbasov

There is exist one incorrect description from different sources, both the Russian and foreign. According it, there is a link from BT to BT-5 with line logic of numbers:

BT-1 – copy of Kristie
BT-2 – first Russian copy of Kristie
BT-3 – developing of BT-2
BT-4 – BT-3 Twin Turret
BT-5 – developing of BT-2 with 45 mm gun and new turret
BT-6 – middle variant between BT-5 and BT-7
BT-7 - .....
Etc. with modifications.

This story was born by linear logic with minimum information from original sources and it is absolutely incorrect! Unfortunately, linear logic is not for us (Russians).

There was exist official Government Plan of Experimental Designing Works, 1933, Works Program of New Projecting Section of designing bureau T-2K (located on Kharkov’s Stem-Locomotive Factory), 1933, Jan. 27, signed by Leader of T-2K program V.V. Fokin. Many Russian sources has reference on this program.

The most serious sources with serious historical discovering should be noted:
-Maxim Kolomiets “Series of BT light tanks. Flying tank of 1930th”, Moscow, “EKSMO”, 2007
-Magazine “Armorcollection”, 1996, N1(4), under redaction of greatest Russian military historian Baryatinskiy M.B.

T-2K Programm is long and I think to translate it fully no reason. There are different requests of many experimental samples, much of them was not build or had no visual difference with serial samples, or were pre-serial samples, so, I’ll translate only the essence of the most interesting items.

According it must be done next:
BT-3 – release to serial production of drawings with metrical sizes of threads, but corresponding to a all features of BT-2 manufacturing (remember that BT-2 was as initial Kristie variant with American sizes. They use inches!)

BT-4 - was a factory prototype by "Kharkov Factory"

BT-5 with different engines an one project with 76 mm gun.

BT-6 – assembly drawings finishing of vehicle, arranged as BT-5 with 45 mm gun , with fully welded body, it segments and units, with weld seam from non-carburized side of armor, according to BT-experiments in 1932, summer. Production of working drawings to manufacturing of experimental samples.

“BT” – only drawings project with minimal weight, maximal speeds especially on track-links drive with heaviest weapon. As result, we can see, that BT-3 is the same BT-2, but with metrical treads.

BT-6 is BT-5 with fully welded body, cheaper carburized armor against molybdenum.

Concerning BT-5 – it was planned as a transient vehicle to a BT-3, because last one planned to have only metrical treads, but BT-5 had both metrical and inches. (No linear logic)

Some sources have information about BT-6, that one sample was almost ready, but was stopped, because government issued order with main target to improve quality of BT-5. Reject rate of last one achieved approx 50%!!!

In BT-6 section you will find photos of BT-6, this info is confirmed! According to the designing program listed above, BT-6 was geometrically equal to BT-5, but with difference in driver’s hatch.

BT-SV and BT-SV II "Turtle"
In section BT-SV there are photos. You’ll find that construction on the top is not an armor, metal sheets are very thin
-on the front photos You will find standard turret of BT-SV inside this construction. This is not an APC. This is just a construction for transportation, as described in different sources. Why it is so – nobody knows. Look like technology money-eater. They were exist in a big quantity during 1930th in USSR.

Alexander Kolbasov - (Rusline LMS Leading Engineer)


"Christi T-3"

The photes are made by Narayan Senupta, on Aberdeen Proving Ground - www.peachmountain.com/5Star

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The T3 Tornado and other Christi tanks are the ancestors to the famous Soviet BT series of tanks and thus also influenced the design of the T-34 tank. This model is the M1931 (model 1931) and was also referred to as the T3. This tank was derived from the earlier M1928. The M1931 was 2 ton's heavier, better armoured and mounted a turret sporting a 37mm gun.
The US bought 3 of the Christi T3 tanks and the Soviets bought 2.The US didn't proceed further with this design, but the Sovietsdid basing the BT tanks almost directly on the Christi.


Kit UM403 - Christie Tank T3 - 1931/1940 - model built by Zhenmin Han

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Model built by Juraj Korpa

um/72403/2/01.jpg um/72403/2/02.jpg um/72403/2/03.jpg um/72403/2/04.jpg um/72403/2/05.jpg um/72403/2/06.jpg um/72403/2/07.jpg um/72403/2/08.jpg um/72403/2/09.jpg um/72403/2/10.jpg


"Christi M1940 / BT-2 hull without turret - Model built by Vladimir Yakubov (www.RussianNavy.net) - (converted UM BT-2 model)"

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"BT-1 Variants"

1931 Soviet BT-1 Light Tank Two m.g.
1932 Soviet BT-1 Light Tank Two m.g.

Bt/91.jpg Bt/99.jpg


"BT-2 Variants"

1931 Soviet BT-2 Light Tank gun + m.g.
1931 Soviet BT-2 Light Tank gun + non-coaxial m.g.
1931 Soviet BT-2 Light Tank three m.g.
1931 Soviet BT-2 Light Tank Two m.g. + non-coaxial m.g.

Bt/92.jpg Bt/93.jpg Bt/94.jpg Bt/95.jpg


1932 Soviet BT-2 Light Tank gun + m.g.
1932 Soviet BT-2-1 Light Tank Two m.g. + non-coaxial m.g.
Possible turret layouts<

Bt/100.jpg Bt/101.jpg Bt/bt2/01.jpg


Kit UM338 - BT-2 w/machine guns - Model built by Zhenmin Han

Bt/br2/02.jpg um/72338/01.jpg um/72338/1/01.jpg um/72338/1/02.jpg um/72338/1/03.jpg

Model built by Brett Mahoney

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Kit UM302 - BT-2 with 37mm gun and mg - Model built by Matej Paluda

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Model built by Drew Gleason

um/72302/1/01.jpg um/72302/1/02.jpg um/72302/1/03.jpg um/72302/1/04.jpg um/72302/1/05.jpg um/72302/1/06.jpg um/72302/1/07.jpg

Model built by Augusto Versiani

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Model built by unknown - 1/35 scale - pictures from ww2.mimerswell.com

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Kit um303 - Artillery Tank D-38 (Tank BT-2 w/A-43 turret) - Model built by Zhenmin Han

Bt/d38/01.jpg Bt/d38/02.jpg um/72303/01.jpg um/72303/1/01.jpg um/72303/1/02.jpg um/72303/1/03.jpg


BT-2 1935 with solid disc wheels in place of the spoked type of earlier vehicles

Bt/bt2/bt21935/01.jpg


"BT-3"

(BT-3 is the same BT-2, but with metrical treads)

"BT-4"

1932 Soviet BT-4 Light Tank (two turrets gun and m.g.)

Bt/102.jpg

The BT-4 was a factory prototype by "Kharkov Factory", with hull features similar to the BT-3 but with twin turrets replacing the single turret and minor changes in the suspension. (3 prototypes were produced (with partially riveted hull)

Summary, there are exist only "4 fake photos / photoshop” of BT-4 in internet - (info Alexander Kolbasov)

Bt/bt4/01.jpg Bt/bt4/02.jpg Bt/bt4/03.jpg Bt/bt4/04.jpg

In fact, info for modelers: - (info Alexander Kolbasov)
Main item!!! BT-4 as an official twin turret project had never been exist! In Government Projecting Program BT-4 as project did not exist.
BT-4 started and finished in 1932. Totally were produced 3 tanks on Kharkov Factory, but as experimental sample. It was initiative of the Factory. Government did not give official design order for it. Main difference with BT-2 is welded body. So, 3 samples were produced, then BT-4 production stopped, further their life story unknown. It is possible that they were used for study purposes, but nothing info more. Since 1932 it story missed. Also there is no any information about their using in WW2.

Fake photo 1

Bt/bt4/fake1/01.jpg Bt/bt4/fake1/02.jpg Bt/bt4/fake1/03.jpg Bt/bt4/fake1/04.jpg

Fake photo 2

Bt/bt4/fake2/01.jpg Bt/bt4/fake2/02.jpg

Fake photo 3

Bt/bt4/fake3/01.jpg Bt/bt4/fake3/02.jpg

Fake photo 4

Bt/bt4/fake4/01.jpg Bt/bt4/fake4/02.jpg Bt/bt4/fake4/03.jpg Bt/bt4/fake4/04.jpg


"BT-5 Variants"

As mentioned before, in 1932, the UMM instructed the design teams in Leningrad (T-26) and Kharkov (BT) tp adapt the new 45mm Model 132 tank gun for their tanks, using a common turret. The KhPZ team brought out the BT-5 model 1933 as a result of these instructions. The main change on the BT-5 was the larger cylindrical turret and the new gun, but the wheels were also changed to a simpler convex style. The new turret dispensed with the ball-mounted machine-gun and used a more practical co-axial machine-gun alongside the main gun instead. Both the BT-5 Model 1933 and the early version of the T/26 Model with the new turret were short/lived, because in the maintime, the OKMO team had developed a better designed turret for thr 45mm gun. The original turret developed at KhPZ had only a single, awkwardly placed roof hatch and had inadequate stowage. The new turret had twin hatches and a larger bustle. This became the standard production turret on the BT until 1937, and the production of the BT/5 lasted until 1935.

1933 Soviet BT-5 Light Tank
1934 Soviet BT-5 Light Command Tank
1934 Soviet BT-5 Light Tank
1934 Soviet BT-5A Light Artillery Command Tank
1934 Soviet BT-5A Light Artillery tank

Bt/107.jpg Bt/116.jpg Bt/115.jpg Bt/114.jpg Bt/117.jpg

Kit um360 - BT-5 with cylindrical turret

um/72360/01.jpg


Kit um301 - Russian BT-5 - Model built by Brett Mahoney

Bt/bt5/01.jpg um/72301/01.jpg Bt/bt5/3/01.jpg Bt/bt5/3/02.jpg

Built by unknown - 1/35 scale Zvesda - ww2.mimerswell.com

Bt/bt5/1/01.jpg Bt/bt5/1/02.jpg Bt/bt5/1/03.jpg Bt/bt5/1/04.jpg

Built by Chema Cabero - 1/35 scale - missinglynx

Bt/bt5/2/01.jpg Bt/bt5/2/02.jpg Bt/bt5/2/03.jpg Bt/bt5/2/04.jpg


Kit um313 - RBT-5 with Rockets - Model built by Al Magnus

Bt/rbt5/01.jpg Bt/rbt5/02.jpg um/72313/01.jpg um/72313/1/01.jpg um/72313/1/02.jpg um/72313/1/03.jpg

Model built by Zhenmin Han

um/72313/2/01.jpg um/72313/2/02.jpg um/72313/2/03.jpg um/72313/2/04.jpg um/72313/2/05.jpg


Kit um406 - BT-5 with Rocket Mounting RS-132

Bt/rbt5/03.jpg um/72406/01.jpg


"BT-6 was an experimental tank"

Source page 23 from book “BT tanks” of M. Pavlov, I.Pavlov, I.Zheltov, Moscow, Eksprint, 2001

Bt/bt6/01.jpg Bt/bt6/02.jpg Bt/bt6/03.jpg

BT-6 is BT-5 with fully welded body, cheaper carburized armor against molybdenum.
According to the designing program listed on top, BT-6 was geometrically equal to BT-5, but here You find difference in driver’s hatch. - (Alexander Kolbasov)


"BT-7 and later Variants"

About BT-7, BT-7M, BT-8, A20:
Main difference with BT-5 - rounded shapes of body nose and it maximal width (440 mm for BT-7 instead of 210 mm for BT-5). Increased up to 33'51" angle of front armor sheet.
On the radiator (air-water heat exchanger) installed armored covers. Fully welded body.

First serial turret of BT-7 geometrically was the same as BT-5 turret, then in 1937 appeared conical turret. At the same 1937 were designed truck links with a short length of track to increase durability of track links.

In autumn 1936 appeared BT-7 with diesel engine BD-2, assumed name A-8. In 1939 finished tests of diesel engine BD-2 on two experimental samples A-8. After testing engine received serial name V-2 (well known on T-34).
According to order from People Comissariate from 5th september 1939 tank A-8 with engine V-2 was recommended to serial production with name BT-7M. Sometimes BT-7M called BT-8, because some documentation on the factory had index BT-8. In fact, BT-8 incorrect name of BT-7M.
It was the last representative of serial BT family.

In 1936 on base of BT-7 was experimental designing plan.
Projects were:
- BT-7B-IS - advanced off-road performance, tank with 6 driving wheels instead 2 driving wheels on standard BT.
- BT-9 - increased properties of movability.
Both samples must be done in 1939 but BT-9 even did not start. In place of this, both projects and Design Order Requirements were combined in one project. This idea borned by M.I. Koshkin and it was a step on the way to T-34.

Next and last tank of BT series was A-20, but it is more closer to T-34 and it is another story!! - (Alexander Kolbasov)


Kit um310 - BT-7 M1935 - Model built by Zhenmin Han

Bt/bt7/01.jpg um/72310/01.jpg um/72310/1/01.jpg um/72310/1/02.jpg um/72310/1/03.jpg um/72310/1/04.jpg


Kit um311 - BT-7 M1937 with conical turret - model built by Drew Gleason

Bt/bt7con/01.jpg um/72311/01.jpg um/72311/1/01.jpg um/72311/1/02.jpg um/72311/1/03.jpg um/72311/1/04.jpg um/72311/1/05.jpg um/72311/1/06.jpg um/72311/1/07.jpg


Kit um312 - BT-7A with artillery turret - Model built by Brett Mahoney

Bt/bt7a/01.jpg um/72312/01.jpg Bt/bt7a/1/01.jpg Bt/bt7a/1/02.jpg

Built model by Zhenmin Han

um/72312/1/01.jpg um/72312/1/02.jpg um/72312/1/03.jpg

Built model by Juraj Korpa

um/72312/3/01.jpg um/72312/3/02.jpg um/72312/3/03.jpg um/72312/3/04.jpg um/72312/3/05.jpg um/72312/3/06.jpg um/72312/3/07.jpg um/72312/3/08.jpg


"BT-7M or BT-8"

BT-7M

Bt/bt7m/01.jpg

The BT-8 was a major redesign in 1939. It had a sloping front glacis instead of the previous pointed noses. Had a diesel engine installed. The engine was based on a Hispano-Suiza 12Y aircraft engine.1 Hull MG was placed next to the driver. Used at Khalkin-Gol and in Finland.

The BT-8A was a Artillery tank. It had a 76.2 mm 1927/32 tank gun. (Only a test model built)


"Special BT Variants"


"BT Experimental Variants"

KBT-7 - Commanders Tank

Bt/kbt-7/01.jpg Bt/kbt-7/02.jpg Bt/kbt-7/03.jpg Bt/kbt-7/04.jpg Bt/kbt-7/05.jpg Bt/kbt-7/06.jpg Bt/kbt-7/07.jpg

pictures from shuspanzer.ru

Bt/kbt-7/2/01.jpg Bt/kbt-7/2/02.jpg Bt/kbt-7/2/03.jpg

For more info about this variant, visit: (Russian language)

logo"Shushpanze-ru.livejournaal":

Possible another version - (descripted as Armoured Personals Vehicle based on the BT-7 - but possible fake!)

Bt/kbt-7/1/01.gif


BT-SV

Bt/bt-sv/01.jpg Bt/bt-sv/02.jpg Bt/bt-sv/03.jpg Bt/bt-sv/04.jpg Bt/bt-sv/05.jpg Bt/bt-sv/06.jpg Bt/bt-sv/1/01.jpg Bt/bt-sv/1/02.jpg

BT-SV II "Turtle"

Bt/bt-sv/1/03.jpg Bt/bt-sv/1/04.jpg Bt/bt-sv/1/05.jpg Bt/bt-sv/1/06.jpg

In fact, BT-SV-2 is the same BT-SV but with added observation equipment, mounts (only mounts!!!) for commander panoramic tower on the main turret and periscopic sight of gun.
Project was a top secret, so during running and tranportation for masking and covering of tank silhouette on the top of BT-SV were installed metal covers.

You will find standard turret of BT-SV inside this construction. This is not an APC. This is just a construction for transportation, as described in different sources. Why it is so – nobody knows. Look like technology money-eater. They were exist in a big quantity during 1930th in USSR.

BT-SV “Turtle” (Russian transcription “Cherepaha”) was a real project. It was designed as fire resistant tank and was performed an experiment with fire burning. Found good resistant to external fire. BT-SV was projected wit 40 mm armor to resist 45 mm gun from all distances, but in fact was built with 20-25 mm thick armor. Even with this armor thick tank was overweigted, suspension overloaded and dynamics excessive decreased. So, this project was stopped. - (Alexander Kolbasov)


Fake BT-APC

BT-BMP APC - (Drawings found on - russiannavy.net)

Bt/bt-bmp/01.jpg Bt/bt-bmp/02.jpg Bt/bt-bmp/03.jpg Bt/bt-bmp/04.jpg

About different projects of Soviet APC/BTR:

Red Army doctrine of 30th had not include armored transport for soldiers! There were plans to use for transportation only simple trucks, horses, “on-tank-armor” and “by feet”. So there was no one design project of APC/BTR in USSR until the war. First BTR was designed on GAZ Factory in 1943-1944. Until this period – no one project!
First APC in Red Army was Land-Leased American M-3, but in fact they started to use in real purpose only in 1944. So, neither BT-APC, nor T-34 or KV or T-26 APC were not exist. Were all armored cars and armored trucks. But not for soldiers transport. - (Alexander Kolbasov)


"A20 Last BT version"

Bt/a20/01.jpg Bt/a20/02.jpg Bt/a20/03.jpg Bt/a20/04.jpg


"From BT to T34"

From left to right; BT7, A20, T34

Bt/a20/05.jpg

First T34

Bt/a20/06.jpg


"Finish BT-42 and BT-43"

BT-42 - a captured BT-7, re-armed by and in Finish service

Bt/bt42/01.jpg Bt/bt42/02.jpg Bt/bt42/03.jpg


Kit um339 - Finnish Tank BT42 - Model built by Zhenmin Han

um/72339/01.jpg um/72339/1/01.jpg um/72339/1/02.jpg um/72339/1/03.jpg um/72339/1/04.jpg

BT-42

As the Second World War progressed, the Soviets were fielding better and better tanks. The Finnish Army, on the other hand, had to make due with a large number of captured tanks, which were for the most part lightly armored and armed. The Finns decided to redesign the BT-7 model 1937 tank. They constructed a new turret and armed it with British-made 114.3 mm howitzers that had been supplied by the British during the Winter War (Q.F. 4,5 inch howitzer Mark II, also known as 114 Psv.H/18 in Finland). The Finns constructed 18 BT-42s and these were pressed into service in 1943.
The BT-42 saw action for the first time in 1943, at the Svir River, where it was used to take out enemy pillboxes. The design worked reasonably well against soft targets but was completely unsuitable in the anti-tank role. To counter this, the Finns copied a German-designed HEAT round for the gun, and it was initially thought that it could defeat the sloping armour of the T-34, however, this was not the case. [1] The BT-42 quickly became very unpopular among its crews. Its mechanical weaknesses could mainly be attributed to the new turret, which apart from giving the tank a high profile also added significant weight to the vehicle, stressing the suspension and the engine.
The BT-42s were used again during the major Soviet offensive in 1944. They were deployed in the defence of Vyborg but were unable to stop the advancing Soviet forces. The BT-42 would suffer heavily during the fighting. At one point, a Finnish BT-42 managed to hit a Soviet T-34 18 times, failing even to immobilize the enemy vehicle. The Finns lost 8 of the 18 vehicles engaged without having made any significant contribution to the fighting. It should however be noted that the Finnish armored units were still mostly comprised of old T-26s, T-28s, and BT-42 AFVs, and that all of these suffered losses during these days (including 25 of the 87 T-26s and a third of all A-20 artillery tractors). German emergency supplies of PzKpfw IVs, StuG IIIs and captured T-34s made it possible for the Finns to replace its aging tanks for more efficient ones. The BT-42 was retired soon after the Vyborg battles and was replaced in the role by German-made StuG IIIs.


BT-43 APC with wooden platform

Bt/bt43/01.jpg

BT-43

In March 1943, the Finnish armoured division suggested that 20 BT-7s should be redesigned into armoured personnel carriers. The Finnish HQ gave its approval sign on 18 May 1943, but limited the number of vehicles to 14. A prototype was designed by removing the turret of a BT-7 and by constructing a wooden platform on top of the chassis. Additional hatches were also installed to allow easier embarking and disembarking of the vehicle. The BT-43 prototype was tested in November 1943, but series production was never started. The single prototype was scrapped in May 1945.


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