Japanese cruiser Tenryū

History
Tenryū in Yokosuka, 1925
Empire of Japan
Name:	Tenryū
Namesake:	Tenryū River
Ordered:	1915 Fiscal Year
Builder:	Yokosuka Naval Arsenal, Japan
Laid down:	7 May 1917
Launched:	11 March 1918
Commissioned:	20 November 1919
Out of service:	18 December 1942
Struck:	20 January 1943
Fate:	Sunk by USS Albacore off Madang, New Guinea
General characteristics
Class and type:	Tenryū-class cruiser
Displacement:	3,948 long tons (4,011 t) (standard) 4,350 long tons (4,420 t) (full load)
Length:	142.9 m (468 ft 10 in) o/a
Beam:	12.3 m (40 ft 4 in)
Draft:	4 m (13 ft 1 in) Ship power=51,000 shp (38,000 kW)
Propulsion:	3 × Brown-Curtis geared steam turbines 10 × Kampon boilers 3 × shafts 920 tons oil, 150 tons coal
Speed:	33 knots (61 km/h; 38 mph)
Range:	5,000 nmi (9,300 km; 5,800 mi) at 14 kn (26 km/h; 16 mph)
Complement:	327
Armament:	4 × 14 cm/50 3rd Year Type naval guns 1 × 8 cm/40 3rd Year Type naval guns 2 × Type 93 13.2 mm (0.52 in) anti-aircraft machine guns 6 × 533 mm (21.0 in) torpedo tubes
Armor:	Belt: 63 mm (2 in) Deck: 25 mm (1 in) Conning tower: 51 mm (2 in)

4 m (13 ft 1 in)

Tenryū (天龍^?) was the lead ship in the two-ship Tenryū class of light cruisers of the Imperial Japanese Navy. Tenryū was named after the Tenryū River in Nagano and Shizuoka prefectures.

The Tenryū-class was designed to act as flagships for destroyer flotillas. The design represented an intermediate class between the light cruiser and the destroyer, which had few counterparts in other navies of the time, although it was inspired by a similar concept to the Royal Navy's Arethusa and C-class cruisers. The Imperial Japanese Navy and Japanese shipbuilding industry were still closely associated with the British due to the Anglo-Japanese Alliance, and were able to improve on the British experience.

The Tenryū-class vessels were essentially enlarged destroyers, similar in many aspects to the Kagerō class. With improvements in oil-fired turbine engine technology and the use of Brown Curtiss geared turbine engines, the Tenryū class had more than twice the horsepower of the previous Chikuma class, and were capable of the high speed of 33 knots (61 km/h; 38 mph), which was deemed necessary in their role as flagships for destroyer squadrons. However, by the time of their completion, newer Japanese destroyers, such as the Minekaze class had a design speed of 39 knots, and newer American cruisers, such as the Omaha class also exceeded it in firepower.

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