During the work on the instrument revealed that use 28mm caliber is not economically profitable — would have to develop a munition caliber, conduct its tests run in the establishment. Because the decision to redesign the high-velocity weapons systems under caliber 30H211mm — munitions have been used self-propelled anti-aircraft installation «Jesterka» Praga PLDvK vz. 53/59.
In the years 1967-1968 a new rapid- tool entitled VK.30 been collected. For the tests, it is set on Czechoslovak modification Russian BTR-50P — layout Otter-1 (OT-62 armored personnel carriers). Clear data on the progress of the tests actually have survived, but in 1971, rapid- tool VK.30 set for trial on another Soviet modification of BMP — layout Otter-2 «BVP-1" (by the way Otter-2 just developed under the latest weapons system).
Curb weight Equipment — 160 pounds. Capacity Drum — 120 ammunition. Store received a three-coiled execution — 1st and 2nd round of the store consisted of shrapnel ammunition for 40 units and how much ammunition was in the 3rd turn of the only armor-piercing type. The design rate — up to 650 rounds / min., But in the process of testing rate does not exceed 530 rounds / min. Weight 30H211mm caliber ammunition — 435 g, the initial flight speed about a thousand m / s. The effective range of up to 2000 meters. Automatic fire from the guns had good accuracy with all this gun had Myagenko returns. When the firing could rapidly change the ammunition used — there was a choice then fed into the trunk of ammunition. When a misfire for their frisky elimination (re) had 2 squib with electronic ignition.
Although the Czechoslovak military and refused to 28mm caliber and the creation of a new weapon for him, for the latest VK.30 gave the green light for the development of a special HEAT projectile. New ammunition possessed by subsequent fighting features: armor penetration — one-piece armor up to 90 mm at an angle of 90 degrees. The cumulative projectile received the anti-stabilizers, for that would enable him to form a cumulative jet. Perhaps stabilizers disclosed in the terminal phase of flight, after a certain time, because stabilizers significantly reduced the speed of the weapon. Informations precision line motion and range are not known.
The fate of a promising VK.30
In 1971, Otter-2 «BVP-1" with the established VK.30 transmitted Russian Union, where she held various tests. A few years later, in 1973, development high-velocity gun under the title VK.30 stopped. Possible termination of the prerequisites of development — testing showed deficiencies guns, as it has not been standardized (at that time the country's unification of the Warsaw Pact had a caliber of 37 mm), but it should be noted that the Russian tool for light armored vehicles 2A42 at that time was only in the development, spoofing the system being developed weapons and was not found. Note that the light armored vehicles with the same small-caliber high-velocity gun appeared in Czechoslovakia and the Union of Russian as much in 10 years. Quick-2A42 cannon mounted on a Russian-made BMP-2 occurs on the service in 1983. She received, compared with VK.30, a weak 30H165mm caliber ammunition. Weight of the armor-piercing tracer was 400 g, the initial speed of the bit is not headed for 1000 m / s.
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