Английская Википедия:Ibuki-class cruiser

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The Шаблон:Nihongo cruisers were the last class of heavy cruisers built for the Imperial Japanese Navy (IJN). In order to save design time, the ships were essentially repeats of the earlier Шаблон:Sclass. Begun during World War II, only the lead ship, Шаблон:Ship, was launched, but she was in the process of being converted into a light aircraft carrier when construction was suspended in 1945. She was scrapped the following year. The unnamed second ship was scrapped less than a month after being laid down in order to clear her slipway for an aircraft carrier.

Design and description

The design of the Ibuki class was a minor improvement over the last pair of the Mogami class after those ships had been upgraded during the late 1930s. The main improvement was the replacement of the triple torpedo tube mounts in the older ships with quadruple mounts. They cost 60,000,000 yen each and had a crew of 54 officers and 822 enlisted men.[1]

The ships had a length of Шаблон:Convert overall. They had a beam of Шаблон:Convert and a draft of Шаблон:Convert. They displaced Шаблон:Convert at standard load and Шаблон:Convert at (full load).[2]

They were fitted with four Kampon geared steam turbine sets with a total of Шаблон:Convert, each driving a Шаблон:Convert propeller. Steam was provided by eight Kampon Ro Gō-type three-drum water-tube boilers that operated at a pressure of Шаблон:Convert and temperature of Шаблон:Convert. The ships had a designed speed of Шаблон:Convert. They carried Шаблон:Convert of fuel oil which gave them an estimated range of Шаблон:Convert at Шаблон:Convert. Electrical power was supplied by three Шаблон:Convert turbo generators and two Шаблон:Convert diesel generators.[3]

Armament

The main armament of the Ibuki class was intended to be ten 50-caliber 20 cm 3rd Year Type No. 2 guns mounted in twin turrets, three forward and two aft of the superstructure, numbered one through five from the bow to the stern. The first two forward turrets were on the same level, but the third turret could superfire over the first two.[4] The guns could depress to −5° and had a maximum elevation of 55°. They fired Шаблон:Convert projectiles at a muzzle velocity of Шаблон:Convert. They had a maximum range of Шаблон:Convert at an elevation of 45°[5] and the ship carried 128 rounds per gun.[6] The secondary armament was to consist of eight 40-caliber 12.7 cm Type 89 anti-aircraft (AA) guns in twin mounts.[7] They fired Шаблон:Convert projectiles at a rate between 8 and 14 rounds per minute at a muzzle velocity of Шаблон:Convert; at 45°, this provided a maximum range of Шаблон:Convert, and a maximum ceiling of Шаблон:Convert.[8] The ships were also intended to be equipped with four twin 25 mm Type 96 light AA guns abreast the funnel.[7] They fired Шаблон:Convert projectiles at a muzzle velocity of Шаблон:Convert; at 50°, this provided a maximum range of Шаблон:Convert, and an effective ceiling of Шаблон:Convert. The maximum effective rate of fire was only between 110 and 120 rounds per minute due to the frequent need to change the fifteen-round magazines.[9] Two twin 13.2 mm Type 93 machine gun mounts were supposed to be mounted on the bridge with 2,000 rounds per gun.[10]

The Ibuki-class ships were intended to be armed with four rotating quadruple Шаблон:Convert Type 92 torpedo tubes, two on each broadside. The ship carried 24 Type 93 torpedoes, 16 in the tubes and 8 in reserve. Quick-reloading gear was installed for every mount that allowed the reserve torpedoes to be loaded in three to five minutes in ideal conditions.[11] The Type 93 torpedo, fueled by compressed oxygen and widely referred to in post-war literature as the "Long Lance", had three range/speed settings. It had a range of Шаблон:Convert at a speed of Шаблон:Convert, Шаблон:Convert at Шаблон:Convert, or Шаблон:Convert at a speed of Шаблон:Convert.[12] Before Ibuki was launched, one proposal was made to replace the aircraft and their equipment with five quintuple Type 0 torpedo tube mounts. Two of these would be mounted on each side and the last on the centerline, but nothing was done.[13]

Fire control, sensors and aircraft

Two Type 94 fire-control directors, one atop the bridge and the other abaft the funnel, were going to be fitted to control the main guns. They used range data received from three Шаблон:Convert coincidence rangefinders. Two of these were to be installed in turrets Nos. 3 and 4 while the primary rangefinder was mounted above the bridge. A pair of Type 94 high-angle directors, one on each side of the bridge, were intended to control the Type 89 guns. Each director was fitted with a Шаблон:Convert rangefinder. The 25 mm guns would have been controlled by two Type 95 directors mounted on the bridge.[14]

Early warning would have been provided by a Type 2, Mark 2, Model 1 air search radar mounted at the top of the foremast. A Type 93 passive hydrophone system would have been fitted in the bow. The ships were designed to carry three aircraft on a platform between the funnel and the mainmast. These would have consisted of one three-seat Aichi E13A and two two-seat Yokosuka E14Y floatplanes. They would have been launched by a pair of Kure Type 2 aircraft catapults, one on each side of the aircraft platform. The ships would have carried a total of 122 powder charges for the catapults as well as four Шаблон:Convert bombs for the aircraft.[15]

Armor

The ships' armor scheme was only slightly modified from the Mogami-class cruisers. Their waterline armoured belt extended all the way down to the double bottom. It extended from the forward to the rear magazines below the fore and aft turrets and was angled inwards at the top 20° from the vertical to improve its resistance to horizontal shellfire. Over the machinery spaces, it was Шаблон:Convert thick at the top and tapered to Шаблон:Convert at the bottom. The outer ends of the fore and aft machinery compartments was protected by a Шаблон:Convert transverse bulkhead. On the sides of the magazines, the belt was Шаблон:Convert thick and tapered to 30 mm at the bottom. The magazines were protected by fore and aft transverse bulkheads Шаблон:Convert thick. The steering gear and the rudder compartments had sides that consisted of Шаблон:Convert plates and their ends were protected by Шаблон:Convert of armor.[4]

The deck above the steering gear and rudders was Шаблон:Convert thick. The thickness of the armored deck ranged from Шаблон:Convert on the flat and Шаблон:Convert on the slope. The sides of the conning tower were 100 millimeters thick while its roof was Шаблон:Convert thick. The main gun turrets had Шаблон:Convert of armor on all sides and on the roof. The barbette armor ranged from Шаблон:Convert in thickness. The ammunition hoists for the secondary armament were protected by Шаблон:Convert of armor. The funnel uptakes were provided with Шаблон:Convert of armor. There was no separate anti-torpedo bulkhead as that function was performed by the lower extension of the belt armor.[16]

Ships

The two Ibuki-class cruisers were ordered in November 1941 as part of the IJN's Rapid Naval Armaments Supplement Programme. Both ships were laid down without names, just as Warships No. 300 and No. 301, but the former was named Ibuki on 5 April 1943.[17]

Ibuki-class heavy cruisers
Builder Laid down Launched Notes Fate
Шаблон:Ship Kure Naval Arsenal, Kure[18] 24 April 1942[18] 21 May 1943[18] Converted to a light aircraft carrier, December 1943[19] Scrapped, 22 September 1946[19]
No. 301 Mitsubishi Shipyard, Nagasaki[18] 1 June 1942[18] Scrapped, 30 June 1942[18]

No. 301 was ordered scrapped less than a month after she was laid down in order to clear her slipway for the carrier Шаблон:Ship which was laid down on 1 October 1942.[20] After her launch, the construction of Ibuki was suspended in July 1943 while her fate was discussed. A possible conversion to a fast oiler was considered until the Navy decided on 25 August to convert her to a light aircraft carrier at Sasebo Naval Arsenal. Work on the conversion did not begin until the incomplete hull was towed to Sasebo on 21 December. It was originally intended to complete her in March 1945, but this was extended until August. Construction was suspended on 16 March, when the ship was about 80% complete, to allow for the construction of small submarines. Ibuki was scrapped at Sasebo from 22 November 1946 to 1 August 1947.[21]

Notes

Шаблон:Reflist

References

Шаблон:WWII Japanese ships

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  1. ↑ Lacroix and Wells, pp. 540–41, 543, 826
  2. ↑ Jentschura, Jung and Mickel, p. 87
  3. ↑ Lacroix and Wells, pp. 825–26
  4. ↑ 4,0 4,1 Lacroix and Wells, p. 542
  5. ↑ Campbell, pp. 185–86
  6. ↑ Lacroix and Wells, p. 543
  7. ↑ 7,0 7,1 Lacroix and Wells, p. 825
  8. ↑ Campbell, pp. 192–93
  9. ↑ Campbell, p. 200
  10. ↑ Lacroix and Wells, pp. 543–44
  11. ↑ Lacroix and Wells, pp. 248, 545
  12. ↑ Campbell, p. 207
  13. ↑ Lacroix and Wells, p. 545
  14. ↑ Lacroix and Wells, pp. 468, 546–47
  15. ↑ Lacroix and Wells, pp. 542, 545, 547
  16. ↑ Lacroix and Wells, pp. 449, 452, 456, 463, 542
  17. ↑ Lacroix and Wells, pp. 539–40
  18. ↑ 18,0 18,1 18,2 18,3 18,4 18,5 Lacroix and Wells, p. 824
  19. ↑ 19,0 19,1 Lacroix and Wells, p. 541
  20. ↑ Lacroix and Wells, p. 540
  21. ↑ Lacroix and Wells, pp. 540–41
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