Japanese cruiser Yura

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NameYura
NamesakeYura River
Ordered1920 Fiscal Year
Yura anchored in Tateyama Bay in early August 1923
History
Empire of Japan
NameYura
NamesakeYura River
Ordered1920 Fiscal Year
BuilderSasebo Naval Arsenal
Laid down21 May 1921
Launched15 February 1922
Commissioned20 March 1923
Stricken20 November 1942
FateScuttled, 25 October 1942
General characteristics (as built)
Class & typeNagara-class cruiser
Displacement5,170 long tons (5,253 t) (standard)
Length162.15 m (532 ft) (o/a)
Beam14.17 m (46 ft 6 in)
Draft4.86 m (15 ft 11 in)
Installed power
Propulsion4 shafts; 4 geared steam turbines
Speed36 knots (67 km/h; 41 mph)
Range6,000 nmi (11,000 km; 6,900 mi) at 14 knots (26 km/h; 16 mph)
Complement450
Armament
Armor
  • Belt: 63.4 mm (2.5 in)
  • Deck: 28.6 mm (1.1 in)
Aircraft carried1 × Floatplane
Aviation facilities1 × Flying-off platform

Yura (由良) was the fourth of the six ships completed in the Nagara class of light cruisers for the Imperial Japanese Navy (IJN), and like other vessels of her class, she was intended for use as the flagship of a destroyer flotilla. She served in the early stages of World War II.

Armament, fire control and protection

The second batch of three Nagara-class cruisers, including Yura, was authorized by the Diet as part of the 8-6 Fleet Completion Program on 12 March 1918 although they were not funded until the Fiscal Year 1920 Naval Estimates. The ships were intended to serve as flagships for destroyer and submarine squadrons, long-range scouts for the battlefleet, and to protect Japanese merchant shipping.[1] The Nagara class was intended to displace 5,170 long tons (5,250 t) at (standard load) and 5,570 long tons (5,660 t) at normal load, but was slightly overweight and actually displaced 5,690 long tons (5,780 t). They had an overall length of 162.15 meters (532 ft), a beam of 14.17 meters (46 ft 6 in), and a draft of 4.86 meters (15 ft 11 in) Their crew numbered 37 officers and 413 enlisted men. When serving as a flagship, an additional 5 officers and 22 enlisted men were embarked.[2]

The Nagaras propulsion system consisted of four geared steam turbines, each driving one propeller shaft using steam from a dozen Kampon water-tube boilers. All of the boilers but two were oil-fired and those used a mixed-firing system where fuel oil was sprayed onto the coal to increase power. The turbines developed a total of 90,000 shaft horsepower (67,000 kW) and were intended to give the cruisers a speed of 36 knots (67 km/h; 41 mph). Yura only reached 35.2 knots (65.2 km/h; 40.5 mph) from 94,331 shp (70,343 kW) when the ship ran her sea trials on 18 February 1923. The ships carried enough fuel oil and coal to give them a range of 6,000 nautical miles (11,000 km; 6,900 mi) at 14 knots (26 km/h; 16 mph), an increase of 1,000 nmi (1,900 km; 1,200 mi) from their designed range.[3][4]

Ship recognition diagram of the Nagara-class cruisers from the US Office of Naval Intelligence

The cruisers' main battery consisted of seven 14-centimeter (5.5 in) 3rd Year Type guns in single gun mounts protected by gun shields. Five of the guns were mounted on the centerline, one pair mounted back to back forward of the bridge and three aft of the funnels, on the aft superstructure. The remaining guns were positioned abreast the bridge, one on each broadside. For anti-aircraft defense, the ships were fitted with a pair of 76-millimeter (3 in) 3rd Year Type anti-aircraft (AA) guns abreast the middle funnel and two 6.5-millimeter (0.26 in) Type 3 heavy machine guns on a platform between the middle and rear funnels, one on each broadside. The ships were equipped with four rotating Type 8 twin-tube mounts for 61-centimeter (24 in) Type 8 torpedoes, two mounts on each broadside. Each tube was provided with a single reload torpedo forward of the mount. The Nagara-class ships were fitted with two rails at the stern that could accommodate 48 No. 1 naval mines These were actually a pair of mines that were connected by a 100-meter (110 yd) cable and were intended to be dropped ahead of ahead of enemy ships so that hitting the cable would draw one or both mines in towards the ship's hull.[5]

The main guns were controlled by a Type 13 director located at the top of the tripod mast. To determine the distance to the target, a pair of 2.5-meter (8 ft 2 in) rangefinders were fitted, one on the bridge and the other near the 6.5 mm machine guns. An additional 1.5-meter (4 ft 11 in) rangefinder was positioned on a platform between the forward and middle funnels.[6]

The armor of the 5,500-ton cruisers was designed to protect against American 4-inch (102 mm) shells and the ships were equipped with a waterline armor belt 63.4 millimeters (2.50 in) thick amidships that protected the propulsion machinery. Made from high-tensile steel, it consisted of a inner 25.4-millimeter (1 in) plate and an outer 38-millimeter (1.5 in) plate. The belt connected to the armored deck at the top and the double bottom below. The deck armor was also high-tensile steel, 28.6 millimeters (1.13 in) thick.[2]

Aircraft

Inspired by the British deployment of aviation facilities aboard their C-class and Danae-class cruisers, the Nagara-class cruisers were built with an aircraft hangar in the forward superstructure and a 10-meter (390 in) flying-off platform that extended over one of the forward guns. Yura conducted trials with a Yokosuka E1Y2 reconnaissance floatplane in 1927–1928 that was stowed on the flying-off platform and lowered to the sea for takeoff and recovered by a derrick installed next to the bridge. The ship had an experimental spring-powered catapult installed on the platform in mid-1930 for trials with an Aichi E3A1 floatplane. Numerous accidents caused its replacement in October by a cordite-powered, 17-meter (55 ft 9 in) Kure Type 2, Model 2 catapult.[7]

During Yura's September 1933 – January 1934 refit, the hangar was converted into offices for the admiral's staff, radio rooms and storage compartments, the flying-off platform, its catapult and the derrick was removed and a rotating 19.4-meter (63 ft 8 in) Kure Type 2, Model 3 catapult was installed forward of the mainmast, between two gun mounts. The pole mainmast was converted into a tripod mast with a stronger derrick to handle the aircraft. The cruiser operated a Nakajima E4N2 floatplane until the end of 1934 when a Kawanishi E7K floatplane was embarked.[8]

Modifications

During her September 1933 – January 1934 refit, the ship's anti-aircraft suite was upgraded; the 76 mm AA guns was replaced by twin mounts for 13.2-millimeter (0.52 in) Type 93 machine guns and the 6.5 mm machine guns were replaced by 7.7-millimeter (0.30 in) Lewis guns. In addition a quadruple mount for Type 93 machine guns was installed in front of the bridge and the 2.5-meter rangefinder on the bridge was replaced by a 3.5-meter (11 ft 6 in) model. After the torpedo boat Tomozuru capsized during a storm in 1934, the IJN realized that many of its ships were top-heavy and began modifying them to make them more stable. Yura began her modifications in October that included reducing the amount of equipment above the upper deck, shortening the foremast, and adding 195 long tons (198 t) of ballast. The IJN took advantage of the ship's time in the shipyard to convert the mixed-firing boilers to fuel oil only and converting the lower coal bunkers to oil storage and the upper bunkers to a radio room and storage compartments. The ship was also modified to pump 199 long tons (202 t) of seawater aboard to her improve her stability as necessary.[9]

After several of the 5,500-ton cruisers suffered structural damage during the Fourth Fleet Incident in 1935, the ship's hull was strengthened by reinforcing the joints and adding Ducol steel plates to the deck and sides in 1936–1937. A single 12.7 mm (0.50 in) BI machine gun was installed on the bridge in July 1937. The 13.2 mm machine gun mounts were replaced by four 2.5 cm Type 96 AA guns in twin mounts in 1938.[10]

Construction and career

Notes

Bibliography

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