St vz 39

'''ST vz. 39 or V-8-H''' was a Czechoslovakian medium tank developed by ČKD in the late 1930s. Only two prototypes were ever built.

Description
In the fall of 1937 the Czechoslovak armed forces launched a contest for new medium tank. The contest participated Skoda, CKD and Tatra. Most interesting was a tank company ČKD V-8-H (later ST vz. 39). Immediately after the first test tank had 143 errors of which only 16 were more serious. The tanks mostly had to replace the engine, the army was at least somehow satisfied. Due to the worsening international situation, the army decided to order 300 tanks, and later a further 150 more, but the order was canceled after the Munich Agreement of 1938. After the occupation of the remainder of Czechoslovakia March 15, 1939, representatives of the German armaments office selected V-8-H for Army testing polygon in Eisenach. As a result of fortnight testing, order was issued in November 1939 on making another prototype. This was to be delivered without turret and armament, only with a concrete block to simulate load. This marked a prototype V-8-HII (second option), or V-8-Hz (trial) in the second half of 1940, underwent tests in Germany Kummersdorf. Germans did not ordered production, because V-8-H technical parameters were only similar to already mass-produced PzKpfw III. After the occupation, the company tried to break through with a tank on the international market. Romania is the first reported, as requested by the former Czechoslovak prototypes of the T-21, V-8-H, R-2a. All tanks passed the tests in Romania successfully. Therefore reluctant to choose a tank, considered the first R-2a, then again on V-8-H, but later opted for a T-21, which ordered in 216 pieces. The company tried to offer tank in Sweden, China, USSR, Italy. For the last time tried in Turkey that would have required gun Skoda A7 of the LT vz 38. Nevertheless no order has been made.

Fate
Both prototypes survived war, but were scrapped soon afterward.