while she was fitting out. Imperatritsa Ekaterina Velikaya did not suffer from the same degree of trim by the bow by virtue of her greater size and retained her forward guns. Propulsion The two Russud-built ships were fitted with four Parsons-type steam turbines imported from John Brown & Company of the United Kingdom while Imperatritsa Ekaterina Velikayas turbines were built by ONZiV with technical assistance from Vickers Limited. They were designed for a total of ( in Imperatritsa Ekaterina Velikaya), but produced over on trials. 20 mixed-firing triangular Yarrow water-tube boilers powered the turbines at a working pressure of . Their designed speed was 21 knots. Their maximum coal capacity ranged from plus of fuel oil which gave them a range of approximately at full speed or at economical speed. All of their electrical power was generated by three main Curtis 360 kilowatt turbo generators and two 200 kilowatt auxiliary units. Armament The main armament of the Imperatritsa Mariya-class consisted of a dozen Obukhovskii Pattern 1907 52-caliber guns mounted in four triple turrets distributed the length of the ship. The guns were identical to those used in the Gangut-class ships, but the turrets were of a new and roomier design. The fore and aft turrets could traverse a total of 310° while the middle turrets covered an arc of 130° on each side. The guns could be depressed to −5° and elevated to 25° and could be loaded at any angle between −5° and +15°; their rate of fire was supposed to three rounds per minute up to 15° of elevation. The turrets could elevate at 3–4° per second and traverse at a rate of 3.2° per second. 100 rounds per gun were carried at full load. The guns fired projectiles at a muzzle velocity of ; this provided a maximum range of . The secondary armament consisted of twenty /55-caliber B7 Pattern 1913 guns mounted in casemates. They were arranged in two groups, six guns per side from the forward turret to the rear funnel and the remaining four clustered around the rear turret. Three guns per side were situated to fire ahead as that was the most likely direction of attack by torpedo boats as anticipated by the Naval General Staff. Their rate of fire ranged from five to eight rounds per minute and they were provided with 245 rounds per gun. They had a maximum range of