One common type was the BK armored gunboats. This type served in large numbers with the Dnieper Flotilla as well as other Soviet river flotillas. At the time of the German invasion 85 of these were in commission, 68 were under construction, and a further 110 were ordered on August 18, 1941, all of which were completed during the war, and about 90 of which were lost. These boats carried a tank gun in a tank turret as their main armament – early units using T-28 and T-35 turrets, later units using T-34 turrets when these became available in 1939, all fitted with a gun. Model BK-1124 had two turrets and BK-1125 one turret. long and wide, they displaced . They carried a crew of 10 and had a single gasoline engine generating 720 boiler horsepower for a speed of . Besides the 3-inch main armament, the boats carried a 12.7mm machine gun and two 7.6mm machine guns.