The H class was a series of battleship designs for the German Kriegsmarine, intended to fulfill the requirements of Plan Z in the late 1930s and early 1940s.  The upper deck was 80 mm (3.1 in) thick above the magazines and 50 mm (2.0 in) over the machinery spaces. According to Garzke and Dulin, the designs had a speed of 24 kn (44 km/h; 28 mph), 23 kn (43 km/h; 26 mph), and 22.5 kn (41.7 km/h; 25.9 mph), respectively, on just diesel engine power. Especially the often mentioned Großdeutschland (= "Greater Germany") is highly unlikely, as Hitler always feared the loss of a vessel with name of Germany (compare the renaming of Deutschland to Lützow). Four auxiliary boilers were installed to provide backup power; two were oil-fired and were located between the central transmission rooms. , Information on the armament outfits for the designs is equally contradictory.  Fire control radar was unspecified, but the ships, which were to have been completed by 1944, presumably would have been equipped with an arrangement similar to that of Tirpitz as she was outfitted in 1943–44.  The power-plant was rated at 165,000 shaft horsepower (123,000 kW) and 260 rpm; it provided a top speed of 30 knots (56 km/h; 35 mph) as designed. The first variation, "H-39," called for six ships to be built, essentially as enlarged Bismarck-class battleships with 40.6 cm (16.0 in) guns.  The keels for the first two ships were laid at the Blohm & Voss dockyard in Hamburg and the Deschimag shipyard in Bremen on 15 July and 1 September 1939, respectively. Royal Navy HMS Zulu British Tribal Class Destroyer . Speer reassigned some members of the H class design staff to work on new U-boats and other tasks deemed critical to the war effort. The design staff therefore attempted to improve the armor protection for the H-class. . Gröner indicates that H-42 and H-43 were to be armed with eight 48 cm guns, while Garzke and Dulin state that the H-42 design was to have retained the 42 cm guns from the H-41 design and H-43 would have also been armed with 50.8 cm pieces. The first variation, "H-39," called for six ships to be built, essentially as enlarged Bismarck-class battleships with 40.6 cm (16.0 in) guns and diesel propulsion. Having a size ov over 111000 tons and a length of 330 meters, the ship was more than twice the size than other existing battleship of that time. The H44 would have been bigger than the latest U.S. Nuclear Aircraft Carrier, the John C. Stennis Construction of the H-class battleships was part of the Z Plan, a German Navy expansion plan from 1939, and the H-class ships were intended to be 50,000 tons completed. But it was designed just to appease Hitler. , One of the most significant changes was the decision to bore out the over-sized 40.6 cm guns to 42 cm caliber for the H-41 design. The original diesel-only system was replaced by a hybrid diesel and steam turbine arrangement. Gröner states that all three designs were to be equipped with twenty-eight 3.7 cm and forty 2 cm anti-aircraft guns, while Garzke and Dulin report only sixteen 3.7 cm guns and forty 2 cm guns for H-43 and H-44 only; H-42 was to have twenty-four 2 cm guns. The 3.7 cm guns were placed in eight twin mounts while the 2 cm guns were arrayed in six Flakvierling quadruple mountings. [lower-alpha 5] The Oberkommando der Marine (OKM) issued staff requirements at the end of October for a sh… The first variation, "H-39," called for six ships to be built, essentially as enlarged Bismarck-class battleships with 40.6 cm (16.0 in) guns. Comparing the basic data of the different H-class designs shows this very effectively, as shown in the table below: It is obvious that everything after the H40 was far from realization. Over the magazines, the sloped armor was 150 mm (5.9 in) thick; over the machinery spaces it was 120 mm thick.  The results were purely study projects intended to determine the size of a ship with strong enough armor to counter the rapidly increasing power of bombs deployed by the Allies during the war.  The ships were also to be armed with six 53.3 cm (21.0 in) torpedo tubes, all submerged. The first variation, “H-39,” called for six ships to be built, essentially as enlarged Bismarck-class battleships with 40.6 cm (16.0 in) guns. [lower-alpha 6] Rate of fire was expected to be two rounds per minute per gun. The German Kriegsmarine, Battleship Design H43, Battleships, Schlachtschiff H, Schlachtschiff 1939 Although it was obvious that Germany would not be able to build a complete new battleship during wartime, the plans for the H-class battleships were further developed and improved, to study the design of a competitive battleship and increase sheer ship scale to counteract increasing bomb weights. Royal Navy HMS Roberts Monitor . During 1937 the German navalcommand OKM (oberkommando der Kriegsmarine) gave the order to investigate which kind of new battleship would replace the Bismarck-class. , Sixteen dual-mounted 10.5 cm (4.1 in) L/65 C33 Flak guns provided long-range defense against aircraft. 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