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No.1 class landing ship

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Preceded by
  
No.1-class patrol boat

Built
  
1943–1945

No.1-class landing ship

Name
  
No.1-class landing ship

Builders
  
Kure Naval Arsenal Mitsubishi Heavy Industries

Operators
  
Imperial Japanese Navy Republic of China Navy

Cost
  
6,912,000 JPY as first ordered 22 vessels 7,126,000 JPY as second ordered 12 vessels

The No.1-class landing ship (第一号型輸送艦,, Dai 1 Gō-gata Yusōkan) was a class of amphibious assault ships of the Imperial Japanese Navy (IJN), serving during and after World War II. The IJN also called them 1st class transporter (一等輸送艦,, 1-Tō Yusōkan).

Contents

Background

  • The IJN lost too many destroyers while employed as transporters ("Tokyo Express") in the Guadalcanal Campaign.
  • Therefore, the IJN wanted the enforced transporter which could penetrate the front line. It was realized rapidly after Operation Ke.

    • Design

  • In April 1943, the General Staff requested a high-speed military transporter to the Technical Department. The requirements were as follows:
  • Displacement: 1,250 long tons (1,270 t) standard
  • Propulsion: 1 × geared turbine, 2 × boilers, single shaft
  • Speed: 23 knots (26 mph; 43 km/h)
  • Range: 3,500 nmi (6,500 km) at 18 kn (21 mph; 33 km/h)
  • Capacity: 2 × Landing craft (Daihatsu) and 200 tons freight
  • Armament: 2 × 127 mm (5.0 in) or 120 mm (4.7 in) AA guns, 9 × 25 mm AA guns and 36 × depth charges
  • The General Staff thought it was possible to use a variant of the Matsu-class destroyer for this plan, because they aimed to utilise mass production. In this original plan, the requirement for a slope was not considered. They thought about a Japanese version of the High speed transport (APD).
  • The Technical Department, however, did not agree with this plan. They submitted a more aggressive plan to the General Staff. They increased the number of landing craft carried and with the effect of reducing the time for landing operations.
  • In addition, about the mass production effect, they intended to deal with this by reducing the shipyards being used for production.
  • At that time, the stern slope and operating ability of the amphibious tanks were added.
  • In September 1943, the Kure Naval Arsenal finished the detailed design. Her project number was J37.

    • Construction

  • The IJN nominated Kure Naval Arsenal as the main builder and Mitsubishi Heavy Industries as support builder.
  • Lead ship (Landing ship No.1) was constructed at Mitsubishi, laid down on 5 November 1943, launched on 8 February 1944, and completed on 10 May 1944.
  • The Kure Naval Arsenal completed 15 vessels, Mitsubishi completed 6 vessels.
  • The Kure Naval Arsenal was earnest. They made the original sized wooden samples, and learned a work procedure. They used the Yamato's dock and repeated build 2 vessels at the same time. Therefore, most of Kure's vessels were completed within 80 days from being laid down.
  • The completed vessels were sent one by one to the front.

    • Service

  • Their primary role was that of a transporter, however since their armaments were strong they were useful as multi-purpose ships at the front, functioning as transporters, as minelayers and as escort ships.
  • Most of these vessels were sent to the Battle of Leyte and transportation duty of the Bonin Islands. By that time, the IJN already lost air superiority and thalassocracy (naval superiority) in those areas and these vessels suffered heavy losses.
  • 5 vessels survived war and were surrendered to the Allies.

    • References

    No.1-class landing ship Wikipedia
    (Text) CC BY-SA