Satsuma-class battleship

The second Satsuma-class battleship Aki
Class overview
Name	Satsuma class
Operators	Imperial Japanese Navy
Preceded by	Katori class
Succeeded by	Kawachi class
Subclasses	Aki
Built	1905–1911
In commission	1909–1922
Completed	2
General characteristics
Type	Semi-dreadnought battleship
Displacement	19,372–20,100 long tons (19,683–20,423 t)
Length	482–492 ft (146.9–150.0 m)
Beam	83.5–83.6 ft (25.5–25.5 m)
Draft	27.5 ft (8.4 m)
Installed power	20 Miyabara water-tube boilers (Satsuma) 17,300 ihp (12,900 kW) 15 Miyabara boilers (Aki) 24,000 shp (18,000 kW)
Propulsion	2 shafts; 2 triple-expansion steam engines (Satsuma) 2 shafts, 2 steam turbine sets (Aki)
Speed	18–20 knots (33–37 km/h; 21–23 mph)
Range	9,100 nmi (16,900 km; 10,500 mi) at 10 knots (19 km/h; 12 mph)
Complement	800–940
Armament	2 × twin 12 in (305 mm) guns 6 × twin 10 in (254 mm) guns 8 × single 6 in (152 mm) guns (Aki) 12 × single 4.7 in (120 mm) guns (Satsuma) 8 or 12 × single 12 pdr (3 in (76 mm)) guns 5 × 18 in (457 mm) torpedo tubes
Armor	Waterline belt: 4–9 in (102–229 mm) Deck: 2–3 in (51–76 mm) Gun turrets: 7–9.5 in (178–241 mm) Conning tower: 6 in (152 mm) Casemates: 6 in (152 mm)

The Satsuma class (薩摩型戦艦, Satsuma-gata senkan) was a pair of semi-dreadnought battleships built for the Imperial Japanese Navy (IJN) in the first decade of the 20th century. They were the first battleships to be built in Japan and marked a transitional stage between the pre-dreadnought and true dreadnought designs. They saw no combat during World War I, although Satsuma led a squadron that occupied several German colonies in the Pacific Ocean in 1914. Both ships were disarmed and expended as targets in 1922–1924 in accordance with the terms of the Washington Naval Treaty of 1922.