Design and Description
The Admiral-class battlecruisers were designed in response to the German Mackensen-class battlecruisers which were reported to be more heavily armed and armoured than the latest British battlecruisers of the Renown and the Courageous classes. The design was revised after the Battle of Jutland to incorporate heavier armour and all four ships were laid down. Only Hood was completed, however, because the ships were very expensive and required labour and material that could be put to better use building merchant ships needed to replace those lost to the German U-boat campaign.
Hood was significantly larger than her predecessors of the Renown class. As completed she had an overall length of 860 feet 7 inches (262.3 m), a maximum beam of 104 feet 2 inches (31.8 m), and a draught of 32 feet (9.8 m) at deep load. This was 110 feet (33.5 m) longer and 14 feet (4.3 m) wider than the older ships. She displaced 42,670 long tons (43,350 t) at load and 46,680 long tons (47,430 t) at deep load, over 13,000 long tons (13,210 t) more than the older ships. The ship had a complete double bottom. Hood had a metacentric height of 4.2 feet (1.3 m) at deep load, which minimised her roll and made her a steady gun platform. The additional armour added during construction increased her draught by about 4 feet (1.2 m) at deep load, which reduced her freeboard and made her very wet. At full speed, or in heavy seas, water would flow over the ship's quarterdeck and often entered her messdecks and living quarters through ventilation shafts. This characteristic earned her the nickname of "the largest submarine in the Navy". The persistent dampness, coupled with the ship's poor ventilation, was blamed for the high incidence of tuberculosis aboard. The ship's complement varied widely over her career, in 1919 she was authorized 1433 men as a squadron flagship. In 1934, she actually had 81 officers and 1244 men aboard.
The propulsion system consisted of 24 Yarrow water-tube boilers, connected to Brown-Curtis geared steam turbines driving four propellers. The battlecruiser's turbines were designed to produce 144,000 shaft horsepower (107,000 kW), which would propel the ship at 31 knots (57 km/h; 36 mph). However, during sea trials in 1920, Hood's turbines provided 151,280 shp (112,810 kW), which allowed her to reach 32.07 knots (59.39 km/h; 36.91 mph). She carried approximately 3,895 long tons (3,958 t) of fuel oil, which gave her an estimated range of 7,500 nautical miles (13,900 km; 8,600 mi) at 14 knots (26 km/h; 16 mph).
Read more about this topic: HMS Hood (51)
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