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Japanese battleship Tosa

A large ship anchored and at rest near a shoreline.
Tosa at Nagasaki on 31 July 1922; the ship is only complete up to the main deck, hence the lack of any superstructure aside from the small bridge
History
Empire of Japan
Name: Tosa
Namesake: Tosa Province
Ordered: 1918 Fiscal Year
Builder: Mitsubishi, Nagasaki
Laid down: 2 February 1920
Launched: 12 December 1921
Fate:
  • Construction cancelled on 5 February 1922;
  • Scuttled on 9 February 1925
General characteristics
Class and type: Tosa-class battleship
Displacement:
  • 39,900 long tons (40,540 t) standard
  • 44,200 long tons (44,909 t) full load
Length: 234.1 m (768 ft 1 in)
Beam: 30.5 m (100 ft 1 in)
Draught: 9.4 m (30 ft 10 in)
Installed power: 91,000 shp (67,859 kW)
Propulsion:
  • 4 × Brown-Curtis turbines
  • 12 × Kampon boilers (8 oil-fuelled, 4 coal-fuelled)
  • 4 shafts
Speed: 26.5 knots (49.1 km/h; 30.5 mph)
Range: 5,000 nmi (9,300 km; 5,800 mi) at 16 kn (30 km/h; 18 mph)
Complement: 1,333
Armament:
Armour:
  • Deck: 100 mm (4 in)
  • Bulkheads: 230–280 mm (9–11 in), 250 mm (10 in)
  • Belt line: (on 15 degree incline) 250–280 mm (10–11 in)
  • Bridge: 250–360 mm (10–14 in)
  • Barbettes: 230–300 mm (9–12 in)
  • Conning tower: 360 mm (14 in)
  • Torpedo Bulge: 3 layers 25 mm (1 in)

Tosa (土佐?) was a planned battleship of the Imperial Japanese Navy. Designed by Yuzuru Hiraga, she was envisioned as the lead ship of the Tosa class of two 39,900-long-ton (40,540 t) ships. The battleships would have been armed with ten 410 mm (16.1 in) guns and bring Japan closer to its goal of an "Eight-four" fleet (eight battleships and four battlecruisers). However, after the Washington Naval Conference and the signing of the Washington Naval Treaty, all work on the ship was halted. With the vessel required to be destroyed in accordance with the terms of the treaty, the incomplete Tosa was then subjected to various tests to gauge the effect of Japanese weaponry before being scuttled on 9 February 1925.

Designed by Yuzuru Hiraga, Tosa was intended to be part of a Japanese "Eight-four fleet", comprising eight battleships and four battlecruisers, the successor to the proposed "Eight-eight fleet". Tosa and her sister ship Kaga were intended to be the second set of high-speed battleships (after the Nagato class) under the plan, and were approved for construction in the Diet's 14 July 1917 warship-building authorization. Engineering blueprints for the two ships were completed by Japanese naval engineers in 1919. Based on Japanese studies of the British experience at the Battle of Jutland, the ships were to include new features over previous designs, including higher steaming speed despite increased tonnage, flush decks, and inclined armor.


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