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The Japanese battlecruiser Tsukuba
|Builders:||Kure Naval Arsenal, Japan|
|Operators:||Imperial Japanese Navy|
|Preceded by:||Kasuga class|
|Succeeded by:||Ibuki class|
|Length:||134.11 m (440.0 ft)|
|Beam:||22.80 m (74.8 ft)|
|Draft:||7.95 m (26.1 ft)|
|Propulsion:||Two Shaft Reciprocating VTE steam engine; 20 boilers, 20,500 shp (15,290 kW)|
|Speed:||20.5 knots (38 km/h)|
|Range:||2000 tons coal; 160 tons oil
5,000 nautical miles (9,000 km) at 14 knots (26 km/h)
Construction of the Tsukuba-class battlecruisers was ordered under the 1904 Emergency Fleet Replenishment Budget of the Russo-Japanese War, spurred on by the unexpected loss of the Yashima to a naval mine in the early stages of the war.
The main battery on the Tsukuba-class were four 12-inch 41st Year Type guns, mounted in twin gun turrets to the fore and aft, along the centerline of the vessel. Secondary armament consisted of twelve 6-inch guns and twelve 4.7-inch 41st Year Type guns.
Propulsion was by two vertical triple-expansion steam engines, with twenty boilers, yielding 20,500 shp (15,300 kW) design speed of 20.5 knots (38.0 km/h; 23.6 mph) and a range of 5,000 nautical miles (9,000 km) @ 14 knots (26 km/h; 16 mph). During speed trials in Hiroshima Bay prior to commissioning, Ikoma attained a top speed of 21.75 knots (40.28 km/h; 25.03 mph)
Ships in class
Ikoma circumnavigated the southern hemisphere of the globe in 1908. She served patrol duty during World War I primarily in the Pacific Ocean and in Southeast Asia. Ikoma was a victim of the Washington Naval Agreement of 1923.
- Evans, David (1979). Kaigun: Strategy, Tactics, and Technology in the Imperial Japanese Navy, 1887-1941. US Naval Institute Press. ISBN 0-87021-192-7.
- Gardiner, Robert; Gray, Randal, eds. (1984). Conway's All the World's Fighting Ships: 1906–1921. Annapolis, Maryland: Naval Institute Press. ISBN 0-85177-245-5.
- Jentschura, Hansgeorg; Jung, Dieter; Mickel, Peter (1977). Warships of the Imperial Japanese Navy, 1869–1945. Annapolis, Maryland: United States Naval Institute. ISBN 0-87021-893-X.