NAVYPEDIA

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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, mm	belt: 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

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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 pro

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.