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IBUKI armoured cruisers (1909 - 1911)


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  Ibuki 1909

Ships


Name No Yard No Builder Laid down Launched Comp Fate
伊吹 [Ibuki]     Kure K K 22/5/1907 21/11/1907 1/11/1909 for disposal 9/1923
鞍馬 [Kurama]     Yokosuka K K 23/8/1905 21/10/1907 28/2/1911 for disposal 1923


Technical data


Displacement normal, t

14636

Displacement full, t

15595

Length, m

147.8

Breadth, m

23.0

Draught, m

8.00

No of shafts

2

Machinery

Ibuki: 2 Curtis steam turbines, 18 Miyabara boilers

Kurama: 2 VTE, 28 Miyabara boilers

Power, h. p.

Ibuki: 24000

Kurama: 22500

Max speed, kts

Ibuki: 21.5

Kurama: 20.5

Fuel, t

Ibuki: coal 2000 + oil 218

Kurama: coal 1868 + oil 200

Endurance, nm(kts)9000(10)
Armour, mmbelt: 178 - 102, upper belt: 127, 12`` barbettes: 178 - 127, 12`` turrets: 178 - 127, 8`` turrets: 152, casemates: 127, deck: 76, CT: 203
Armament

2 x 2 - 305/45 41-shiki, 4 x 2 - 203/45 41-shiki, 14 x 1 - 120/40 41-shiki, 4 x 1 - 76/40 41-shiki, 3 - 450 TT (1 bow, 2 beam)

Complement

844



Standard scale images


<i>Kurama</i> 1912
Kurama 1912
<i>Kurama</i> 1914
Kurama 1914


Graphics


  <i>Ibuki</i> 1909
  Ibuki 1909
<i> Kurama</i>
Kurama


Ship project history


Cruisers with very heavy artillery, but relatively slow speed. Frequently they were classified as battleships with the facilitated armour protection: to a certain extent it is possible to consider them as "relatives" of Russian Peresvet class battleships.

The project was developed on the basis of armoured cruiser Tsukuba. Originally Ibuki and Kurama should be identical, but for the former ship Curtiss steam turbines were ordered in spring 1906, and project should be redesigned thoroughly. Officially Ibuki has been laid down 22/5/1907, but her building has begun earlier. Ibuki became the first Japanese turbine-driven ship, but it has not made her faster: on trials Kurama has reached 21.5kts at 23081hp, and Ibuki made 21.16kts at 28977hp. Outwardly both ships differed by masts: Kurama had tripod ones and Ibuki had usual pole masts.

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. Main barbettes and turrets had 178mm armour, secondary


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. Main barbettes and turrets had 178mm armour, secondary turrets had 152mm. There were main CT with 203mm sides and aft CT with 152mm sides. Protected deck was 51mm amidships and 76mm at ship ends. Modernizations: None.

Naval service


In the First World War beginning Ibuki participated in chase for Spee squadron, and then escorted military transports from Australia to Suez. Both ships have been disarmed after Washington conference and broken up in 1924-1925.