ST vz. 39

1. Would you like to see this vehicle added to the game?
  • Yes
  • No

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Brief Summary:

The ST vz. 39 also known as the V-8-H was a medium tank developed by CKD during the late 1930’s and like many of the Czechoslovakian medium tanks being developed never got out from the prototype stages of development. Like many of the earlier Czech attempts to create a medium tank the project would be plagued with many issues in particular the engine which had been apparent on earlier Škoda and Tatra designs during the early and mid 1930’s.


Development of the CKD V-8-H would start in October 1936 around the same time Škoda and Praga were working on the ŠP-II-b another prototype medium which would eventually evolve into the Hungarian Turan series of tanks. Cooperation between Czechoslovakian companies was high in the 1930’s with many of these projects sharing components and designs leading to a quick development with the first prototype being ready and conducting factory tests in the summer of 1937. Tests with the military were supposed to be conducted in December 1937 in Milovice however according to both CKD and army officials no such tests took place.

Blueprints of the V-8-H as originally intended.

Like with the majority of Czechoslovakian medium tanks the tank would have 143 listed failures by February 1938, 16 of which were serious in nature with the biggest problem being the Praga NR engine which was powerful but not yet tuned. The undercarriage was another major issue with the rubber bandings of the support wheels constantly falling off which would result in a major rebuild of the tank in March 1938 to try and alleviate these issues. Rigorous testing would continue with the new reconstruction of the vehicle with test drivers praising it’s easy handling and not to demanding maintenance however the testing committee were still not satisfied with the vehicle. The committee had proposed several changes to the design before interruptions in April 1938 with the concerns for the vehicle being on the shape of the hull which mainly concerned the new curved front wall regarding it’s fighting compartment and machinegun placement.


Around April 1938 the tank had finally received a complete turret armed with the 47mm Škoda A11 cannon and a ZB-53 machinegun whilst the engine cooling and gear box had received minor changes with the reconstructions finishing by May 1938 and would continue to do tests until August 1938 were the tank would be send to the factory to replace the transmission with a transmission that had better distributions of speed. From January to August 1938 the tank had travelled 12735m, 5473 of which had been in difficult terrain. Around August of 1938 the vehicle would be selected for a production run of 300 vehicles to be produced by February 1940 of which CKD would be tasked to produce 95 whilst Škoda the other 205 mainly down to CKD’s production run of the very successful LT vz. 38 (Pz 38(t)). It was mainly chosen as despite the committee who deemed the tank not mature enough yet it was the only medium tank of it’s category in the state to begin a production run as medium tanks such as the Škoda T-21 were not ready yet. Like with the LT vz. 38 though the cost for the vehicle from the demands of army was an expected 998,000 crowns a piece however CKD demanded 1,250,000 for each fully equipped tank with the eventuality of the production being agreed upon alongside a further 150 vehicles.

With the Munich Agreement happening in late September 1938 the order for all 450 vehicles was cancelled but the tank would continue to be tested until mid November 1938 were it would be accepted into the army as the ST vz. 39 or Medium Tank model 39. CKD would not take the offer to increase the attractiveness of the vehicle to foreign markets for a commission of 5% and would try to offer the vehicle on the export market on the 21st of November 1938 under it’s factory name.

Germany would occupy the rest of Czechoslovakia by 1939 and the vehicle would be tested at Eisenach where an order for a second prototype would be placed in November 1939 this vehicle however would have a concrete block placed to simulate the load instead of a turret being referred to as V-8-H II or V-8-Hz. Despite the Wehrmacht buying this vehicle because of the Panzer III’s similar technical parameters there was no question of equipping the tank with a stronger German armament. The V-8-H alongside the R-2a and T-21 tanks would all be demonstrated in Romania with the tests showing favours to all three tanks at different points with the eventuality of the T-21 being chosen for production as the R-3. The tank would also be demonstrated to Italy, Sweden, China and the Soviet Union but proved unsuccessful due to the costs. Out of these Sweden was the closest to buying the vheicle however in the end had chosen the Landsverk Strv m/42. Finally the last serious customer Turkey had shown inrest into the vehicle on the requirements that it would be equipped with the 37mm Škoda A7 cannon from the LT vz. 38 but would be cancelled down to various circumstances and relationships.

Blueprints presented of the V-8-Hsv to Sweden

Both prototypes would be demonstrated to Czechoslovakia again after the war and were eventually scrapped.

The crew of the tank consisted of 4 with the driver sitting on the right side whilst the radio operator on the left of the front each with a 50mm bulletproof glass window whilst the commander and gunner sat on a bicycle seas suspended by metal tubes. The commander had access to a small turret that could fully rotate to view from. The guns had 2.6x magnification scopes.



Dimensions (L-W-H): 5.35m x 2.27m x 2.34m (17’6’’ x 7’4’’ x 7’7’’ ft)

Total Weight: 16.2 tons

Crew: 4 (Driver, Radio Operator, Gunner, Commander)

Propulsion: 8 cylinder Praga Type NR V-8 water-cooled , 260hp engine

Transmission: 4 forward, possibly 4 reverse

Power to Weight Ratio: 16.05hp/ton

Suspension: Leaf springs

Top Speed: 43.5km/h (27 mph)

Main Armament: 4.7cm Škoda A11 (80 rounds)

Vertical Guidance: N/A

Secondary Armament: 2x 7.92mm Vz. 37 (3000 rounds) (one hull mounted one Coaxial)

Stabiliser: No

Armour: 32mm front 20mm sides 12mm bottom and top

Production: 2 prototypes

Additional Images:



+1 Would love to see more Czechoslovakian vehicles in game…but not part of German or Russia TT.

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No offense but isn’t this just the Pz .38 and whatever Sweden calls their version or is this an early model?

You know that Germany used Lz. 38 (they called it Pz.38 (t) ) when they occupied Czechoslovakia. It is not german…it is Czechoslovakian. I wanted to say Germany stole them from us…but apparently the paid for them surprisingly.

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Something like Minor European Nations tree could be nice for like Czechoslovakia, Hungary, Poland, Romania, Yugoslavia ect…


But it is related. It is to the Pz 38 what the Panzer 3 is to the Panzer 2.

The vehicles in the german and Swedish trees are LT vz 35 and LT vz 38 variants. Light tanks (hence “LT”) developed by both Skoda and CKD.

This was a medium tank developed by only CKD.

Historically it had a larger main gun (47mm vs 37mm), more armour (32mm vs 25mm), weighed significantly more (~16 tonnes vs ~10 tonnes), but also powered by an engine twice as powerful (241hp vs 125hp).

However this comparison excludes the later variants of the LT vz 38 produced with 50mm of armour, and some with better engines.


Is the armament the same as on the Panzerjäger I?

Nope. But their performances are very similar.

The gun on the PzJg 1 is a derivative of the A5.

Comparatively, though take it with a grain of salt as the sources are not up to standard.

A5 AP - A11 AP

L/43.5 - L/43.4

775m/s - 782m/s

1.65kg - 1.69kg

I can’t easily find information on their developmental history.

Ah, cool. That provides a solid baseline for performance at least. :)

The difference in muzzle velocity and shell weight doesn’t change much, so I don’t see the variance being a problem gameplay-wise. It’s a good gun at the proper BR, I hope we get to see it.

+1 for Czechoslovakian tech tree


Considdering the greater weight of the shell, is it Solid shot or does it still have the 15g TNT?
What kind of round is it? Also APC or just AP, with or withouf filler? with 15g filler as AP its 81mm/10m and APC 90mm/10m. Without the filler 82 and 91mm/10m.
And as you allready mentioned with different sources, th 1,69 kg round is also mentioned as 1,65 kg, perhaps they build the round with and without filler. (Or at least thats what i have seen when roaming around a bit.

Also Jugoslavian ammo for the 4,7 cm Pak was loaded to a higher charge with higher velocity.

Also as far as i know the 4,7 cm Pak is also L/43,4