Japanese cruiser Aso

Bayan at anchor
History
Russian Empire
Name:	Bayan
Namesake:	Boyan
Ordered:	May 1898
Builder:	Forges et Chantiers de la Méditerranée, La Seyne-sur-Mer, France
Laid down:	March 1899
Launched:	12 June 1900
Completed:	December 1902
Captured:	By Japan, 1 January 1905
Fate:	Sunk, 9 December 1904
Japan
Name:	Aso
Namesake:	Mount Aso
Acquired:	1 January 1905
Commissioned:	22 August 1905
In service:	1908
Reclassified:	As a training ship, 1908 As a minelayer, 1 April 1920
Struck:	1 April 1930
Fate:	Sunk as a target, 4 August 1932
General characteristics
Class and type:	Bayan-class armoured cruiser
Displacement:	7,802 long tons (7,927 t)
Length:	449 ft (136.9 m)
Beam:	57 ft 6 in (17.5 m)
Draught:	22 ft (6.7 m)
Installed power:	26 Belleville boilers 16,500 ihp (12,300 kW)
Propulsion:	2 shafts, 2 vertical triple-expansion steam engines
Speed:	21 kn (39 km/h; 24 mph)
Range:	3,900 nmi (7,200 km; 4,500 mi) at 10 knots (19 km/h; 12 mph)
Complement:	573
Armament:	2 × single 8 in (200 mm) guns 8 × single 6 in (150 mm) guns 20 × single 75 mm (3 in) guns 2 × single 15 in (380 mm) torpedo tubes
Armour:	Belt: 3.9–7.9 inches (100–200 mm) Deck: 2.0 inches (50 mm) Gun turrets: 6.3 inches (160 mm) Barbettes: 6.7 in (170 mm) Conning tower: 6.3 in (160 mm)

The cruiser Bayan (Russian: Баян) was the name ship of the four Bayan-class armoured cruisers built for the Imperial Russian Navy in the first decade of the 20th century. The ship had to be built in France because there was no available capacity in Russia. Bayan was assigned to the First Pacific Squadron after completion and based at Port Arthur from the end of 1903. She suffered minor damage during the Battle of Port Arthur at the beginning of the Russo-Japanese War of 1904–05 and supported destroyers as they patrolled outside the harbour. After bombarding Japanese positions in July 1904, the ship struck a mine and was out of action for the next several months. Bayan was sunk during the Siege of Port Arthur and was then salvaged by the Japanese after the war.

Renamed Aso by the Imperial Japanese Navy (IJN) she served as a training ship after extensive repairs. The ship was converted into a minelayer in 1917 and was decommissioned in 1930 to serve as a target ship. She was eventually sunk as a target in 1932.

Unlike previous Russian armoured cruisers, the Bayan-class ships were designed as scouts for the fleet. They were 449 feet 7 inches (137.0 m) long overall and 443 feet (135.0 m) between perpendiculars. They had a maximum beam of 57 feet 6 inches (17.5 m), a draft of 22 feet (6.7 m) and displaced 7,802 long tons (7,927 t). The ships had a crew of 573 officers and men.

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