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fighting ships of the world

IMPERIAL JAPANESE NAVY (JAPAN)

CRUISERS

TSUKUBA armoured cruisers (1907-1908)

Ikoma 1912

Name No Builder Laid down Launched Comp Fate
筑波 <Tsukuba>   Kure K K 14/1/1905 26/12/1905 14/1/1907 internal explosion 14/1/1917
生駒 <Ikoma>   Kure K K 15/3/1905 9/4/1906 24/3/1908 TS 1919, for disposal 1923

  

Displacement normal, t

13750

Displacement full, t

15400

Length, m

134.1 pp 137.1 oa

Breadth, m

22.8

Draught, m

8.00

No of shafts

2

Machinery

VTE, 20 Miyabara boilers

Power, h. p.

20500

Max speed, kts

20.5

Fuel, t

Tsukuba: coal 2000

Ikoma: coal 1911 + oil 160

Endurance, nm(kts) 9000(10)

Armour, mm

belt: 178 - 102, upper belt: 127, barbettes: 178, turrets: 178, casemates: 127, deck: 76, CT: 203 - 152

Armament

2 x 2 - 305/45 Armstrong J, 12 x 1 - 152/45 Armstrong GG, 12 x 1 - 120/40 Armstrong BB, 4 x 1 - 76/40 Armstrong N, 2 x 1 - 6.5/115, 3 - 450 TT (1 bow, 2 beam)

Complement

879

Ship project history: First capital ships built in Japan and first-ever cruisers armed with 12`` guns in twin turrets. They were ordered in June, 1904 as replacement of lost battleships Hatsuse and Yashima and laid down even before end of the Russian-Japanese war. Building of the ships has been interfaced to industrial problems because of what lead-ship Tsukuba possessed numerous defects. Commission of Ikoma was delayed by shortage of main artillery: ship has gone out on sea trails in November, 1907, but completely has been armed and completed only by February, 1911. On measuring mile Tsukuba has shown 20.5kts at 20736hp, Ikoma made 21.9kts at 22670hp.

Ship protection: Krupp steel. Main belt, extended to 1.2m under wl, was 178mm between barbettes and 102mm at ship ends. The upper belt between barbettes was 127mm, casemates had also 127mm protection. Barbettes and turrets had 178mm armour. There were main CT with 203mm sides and aft CT with 152mm sides. Protected deck was 51mm amidships and 76mm at ship ends.

Modernizations: 1919, Ikoma: - 2 x 1 - 152/45, 4 x 1 - 120/40; + 2 x 1 - 76/40 3-shiki

Naval service: Tsukuba was lost at Yokosuka as a result of magazines explosion; crew losses have made 305 persons the killed. Ikoma since 1919 served as gunnery training ship. Soon after Washington conference, in 1922, she was disarmed and sold for BU 13/11/1924.

Tsukuba 1907

 

Ivan Gogin, 2008-14