|After the end of the Civil War, the various river gunboat flotillas were neglected and decayed in common with the national Soviet Fleet. There was just not enough
money in the ravaged and cash-strapped state. By the early 1930s the situation had changed. A measure of industrial strength had been restored or created and there
was enough cash to improve the branches of the Red Army and Navy. The Dneiper Flotillas was one of the recipients of the new spending on military forces. In 1931
a large gunboat monitor was designed to be added to the Dneiper Flotilla. Designed by A. Baybakov and built at the Leninskaya Kuznitsa Dock Yard in Kiev, as Project
SB-12, the new design was to be heavily armored, heavily armed and to draw only 19-inches of water. Named the Udarnyi, the ship was an one-off design, probably
because she grossly failed in the draft requirements. Very similar to the design failures of the Union’s Casco Class monitors of the American Civil War, the design of
Udarnyi drew far more water than design requirements, limiting riverine use. However, unlike the flops of the Casco Class, the Udarnyi was a powerful river unit.
The increase in draft was the result of an over-weight design, which had large armored barbettes with an armored roof. On top of the barbette roof turntable were
fixed armored pseudo turrets, which turned with the barbette roof. Each turret mounted a single 130mm gun. This design allowed for more shell storage inside the
barbettes. There was an armored cupola on the bridge, which functioned as a conning tower and the bridge also carried rangefinder. The Udarnyi was equipped with
a telescoping mast with crow’s nest that could be raised up to 39-feet (12m) above the deck. Displacement was 262.5-tons with a length of 181-feet 9-inches (55.4
m), beam of 36-feet 5-inches (11.1 m), and draft of 2-feet 8-inches (0.82 m) light and 7-feet (2.14 m) full load. Powered by two 400hp diesel engines with two
propellers, the Udarnyi had a maximum speed of 9-knots. Armament consisted of two 130mm guns, two twin 45mm antiaircraft guns, and four quadruple 7.62mm
Maxim machine gun mounts. Armor plating on critical areas ranged from 6 to 12mm.