Gangut Class Battleship - Design and Development

Design and Development

After the end of the Russo-Japanese War the Imperial Russian Navy was in a state of confusion. Its leadership, tactics and ship designs had all been cast into disrepute by its repeated defeats by the Japanese at the Battle of Tsushima, Battle off Ulsan and the Battle of the Yellow Sea. The Navy took quite some time to absorb the design lessons from the war while the government reformed the Naval Ministry and forced many of its more conservative officers to retire. It conducted a design contest for a dreadnought in 1906, but the Duma refused to authorize it, preferring to spend the money on rebuilding the Army.

The requirements for a new class of dreadnoughts were in a state of flux during 1907, but Vickers Ltd submitted a design that met the latest specifications and was very nearly accepted by the Navy for a 22,000-long-ton (22,000 t) ship with twelve 12-inch (305 mm) guns in triple, superimposed turrets. However rumors of a contract with Vickers raised a public outcry as they had some problems with the armored cruiser Rurik then building in England. The Naval Ministry defused the situation on 30 December 1907 by announcing an international design contest with the ship built in Russia regardless of the nationality of the winning firm. By the deadline of 12 March 1908 a total of 51 designs had been submitted by 13 different shipyards. The winner of the competition was a design from the German firm of Blohm & Voss, but the French protested that they did not want to see any of the money that they had loaned Russia to build up its defenses in German pockets. The Russians bought the design for 250,000 rubles and shelved it to placate both sides. A design by the Baltic Works had been the runner-up and was revised for the Navy's updated requirements with a complete design to be presented by 22 March 1909. This was extended by a month to allow the Baltic Works to finalize its contract with the British firm of John Brown & Company for design assistance with the hull form and machinery.

The Naval General Staff believed that a speed advantage over the 21 knots (24 mph; 39 km/h) German battle fleet would prove very useful in battle, as demonstrated at the Battle of Tsushima, but use of the heavy and bulky Belleville Water-tube boilers, as insisted upon by the Engineering Section of the Naval Technical Committee, would prevent the new design from exceeding 21.25 knots itself. However, after John Brown indicated that the ship's turbines could deliver 45,000 shp (33,556 kW) if supplied with enough steam and that the hull form could reach 23 knots (26 mph; 43 km/h) with 45,000 horsepower, the Naval General Staff took the opportunity to get the speed it desired by using small-tube boilers. It convened a meeting of the Naval Technical Committee to discuss the issue, but packed it with engineers from the fleet who were in favor of small-tube boilers and the Engineering Section was outvoted. The Yarrow small-tube boiler was significantly smaller and lighter than Belleville large-tube boiler, but required more frequent cleaning and repair and their horsepower dropped off more rapidly with use.

The Russians did not believe that super firing turrets offered any advantage as they discounted the value of axial fire, believed that broadside fire was much more important and also believed that super firing turrets could not fire while over the lower turret because of muzzle blast interfering with the open sighting hoods in the lower turret's roof. They therefore designed the ships with a 'linear' arrangement (lineinoe raspolozhenie) of turrets distributed over the length of the ship. This arrangement had several advantages because it reduced the stress on the ends of the ship since the turrets were not concentrated at the end of the ship, increased stability because the lack of elevated turrets and their barbettes, improved the survivability of the ship because the magazines were separated from each other and gave a lower silhouette. Disadvantages were that the magazines had to be put in the middle of all the machinery, which required steam pipes to be run through or around them and the lack of deck space free from blast. This greatly complicated the placement of the anti-torpedo boat guns which ultimately had to be mounted in the hull, closer to the water than was desirable.