IJN Ikoma (BC-1907 (ADV-1927-mod))


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First of the new heavily armed and faster armoured cruisers that Japan had designed and built post-war. The Tsushima Battle had shown the advantages that having fast and large scouting ships. Rated as armoured cruisers through to 1912 when the new rating 'Battlecruiser' was brought in by the Royal Navy.

The Ikoma was almost 20 years old when it was taken in hand for full refurbishment to the Area Defense Vessel type. Because of its age the Ikoma did not have as many new features fitted as some of the more modern pre-dreadnoughts. A cruiser style bridge superstructure was fitted, the funnels were capped to help keep the gasses out of the new bridge, a hangar and catapults were fitted in place of the after bridge and 'Y' 12" turret. For instructional purposes the ship was fitted with 4 of the new twin 5" dual-purpose mountings as fitted to the latest destroyer classes. This was a change from the other ships of Ikomas age which had had the 5" open mounts in tubs fitted. Ships boats included a pair of 13 metre landing craft as the hangar could be split to carry troops. The lower casemate 6" were removed and plated over. The guns being resited in the main gundeck.


Displacement 13,800 tons std, 16,250 tons full load
Length 471 ft
Breadth 75 ft
Draught 26 ft
Machinery 2 shaft Steam turbines, 22,000shp
Speed 21 knots
Range 3,500 miles at 18 knots
Armour 7" side, 2" deck, 7" turrets.
Armament 2 x 12" (1x2)

12 x 6" (12x1)

8 x 5" (4x2)

51 x 25mm (17x3)

Aircraft 3
Torpedoes nil
Complement 840
Notes IJN Tsukuba (1905-1907) Sunk 01/1917 by magazine explosion.

IJN Ikoma (1905-1908)


Ikoma as completed 1908 and as the ship was used during WW1. Ikoma and Tsukubas first WW1 duty was to chase after Von Spee's Squadron of cruisers in conjunction with the two Kurama class battlecruisers. Just those four ships would have seriously outgunned Von Spees ships.


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