Type 3 submergence transport vehicle
Yu 1 in 1943 at Hitachi Ltd., Kasado Factory |
| Class overview |
| Name: |
Type 3 submergence transport vehicle |
| Builders: |
Hitachi Ltd.
Japan Steel Works
Andō Iron Works
Chōsen Machinery |
| Operators: |
Imperial Japanese Army |
| Subclasses: |
Yu I type
• Yu 1 (Hitachi Ltd.)
• Yu 1001 (Japan Steel Works)
• Yu 2001 (Andō Iron Works)
• Yu 3001 (Chōsen Machinery)
Yu II type
• Ushio (Prototype, Hitachi Ltd.) |
| Built: |
1943-1945 |
| In commission: |
1943-1945 |
| Planned: |
400 and more |
| Completed: |
39 |
| Lost: |
5 |
| Retired: |
34 |
| General characteristics Yu I type |
| Type: |
Transport submarine |
| Displacement: |
274 long tons (278 t) surfaced
346 long tons (352 t) submerged |
| Length: |
41.40 m (135 ft 10 in) overall |
| Beam: |
3.90 m (12 ft 10 in) |
| Draft: |
3.00 m (9 ft 10 in) |
| Propulsion: |
2 × Hesselman engines
400 bhp surfaced
75 shp submerged
single shaft |
| Speed: |
10 knots (19 km/h) surfaced
4 knots (7.4 km/h) submerged |
| Range: |
1,500 nmi (2,800 km) at 8 knots (15 km/h) surfaced
32 nmi (59 km) at 4 knots (7.4 km/h) submerged |
| Test depth: |
100 m (330 ft) |
| Capacity: |
24 tons freight or 40 troops |
| Complement: |
23 |
| Armament: |
Yu 1, Yu 2 and Yu 3
• 1 × Type 4 37 mm shipboard gun
• 5 × Type 99 light machine guns
Yu 1001
• 1 × Type 4 37 mm shipboard gun
• 2 × IJN Type 92 13 mm AA guns
Yu 2001
• 1 × Type 4 37 mm shipboard gun |
| General characteristics Yu II type [1] |
| Type: |
Transport submarine |
| Displacement: |
430 long tons (437 t) surfaced
540 long tons (549 t) submerged |
| Length: |
55.00 m (180 ft 5 in) overall |
| Beam: |
7.00 m (23 ft 0 in) |
| Draft: |
3.13 m (10 ft 3 in) |
| Propulsion: |
2 × intermediate diesels
700 bhp surfaced, 2 shafts |
| Speed: |
14.5 knots (26.9 km/h) surfaced
4.5 knots (8.3 km/h) submerged |
| Test depth: |
150 m (492 ft 2 in) |
| Capacity: |
40 tons freight |
| Armament: |
• 1 × Type 1 47 mm AT gun
• 5 × Type 98 20 mm AA guns |
The Type 3 submergence transport vehicle (三式潜航輸送艇, 3-Shiki Senkō Yusōtei?) was a class of transport submarines of the Imperial Japanese Army (IJA), serving during the Second World War. IJA planned to build over 400 boats, however only 38 boats were completed until the end of war. The IJA called them Maru Yu (マルゆ?).
Construction
In 1943 the IJA decided to build a transport submarine for themselves, because the IJA was soundly beaten by in the Solomon Islands campaign and needed a way to supply the isolated garrisons on the Pacific islands.
Boats in classes
Yu I type
The class consists of four unofficial subclasses resulting from manufacturing differences among the contracted builders. The manufacturer may be discerned by the appearance of the sail.
Yu 1 class
Basic model of Yu I type. First boat (Yu-1) was prototype of the Yu I type boats. The Hitachi-Kasado Factory build all of the Yu 1-class boats. Their sail was shut tightly.
- Yu 1, laid down in February 1943, completed on 31 October 1943, lost in an accident at Lingayen Gulf on 2 January 1945.
- Yu 2, sunk by USS Pringle, Renshaw, Waller and Saufley at Ormoc Bay on 27 November 1944.
- Yu 3, lost in an accident at Lingayen Gulf in January 1945, salvaged by USS Grasp on 18 January 1945, carried out by USS Rushmore in May 1945.
- Yu 4, survived war.
- Yu 5, survived war.
- Yu 6, assigned Detachment 2, Transport Sunbmarine Group on 13 February 1945, survived war.
- Yu 7, assigned Detachment 2, Transport Sunbmarine Group in November 1944, survived war.
- Yu 8, survived war.
- Yu 9, survived war.
- Yu 10, assigned Detachment Kuchinotsu, Transport Sunbmarine Group on 15 May 1945, survived war.
- Yu 11, assigned Detachment Kuchinotsu, Transport Sunbmarine Group on 15 May 1945, assigned Detachment Mikuriya in June 1945, survived war.
- Yu 12, assigned Detachment Kuchinotsu, Transport Sunbmarine Group on 15 May 1945, survived war.
- Yu 13, assigned assigned Detachment Mikuriya in June 1945, survived war.
- Yu 14, assigned Detachment Kuchinotsu, Transport Sunbmarine Group on 15 May 1945, assigned Detachment Mikuriya in June 1945, survived war.
- Yu 16, survived war.
- Yu 17, survived war.
- Yu 18, survived war.
- Yu 19, survived war.
- Yu 20, survived war.
- Yu 21, survived war.
- Yu 22, survived war.
- Yu 23, survived war.
- Yu 24, survived war.
- Yu 25, incomplete until the end of the war.
Yu 1001 class
The Japan Steel Works-Kaita Factory build all of the Yu 1001-class boats. They equipped open-top sail.
- Yu 1001, assigned Detachment 2, Transport Sunbmarine Group in November 1944, sunk by air raid at Shimoda on 12 August 1945.
- Yu 1002, assigned Detachment 2, Transport Sunbmarine Group on 11 February 1945, survived war.
- Yu 1003, assigned Detachment 2, Transport Sunbmarine Group on 11 February 1945, survived war.
- Yu 1005, assigned Detachment 2, Transport Sunbmarine Group on 13 February 1945, survived war.
- Yu 1006, survived war.
- Yu 1007, assigned Detachment Kuchinotsu, Transport Sunbmarine Group on 15 May 1945, assigned Detachment Mikuriya in June 1945, survived war.
- Yu 1008, survived war.
- Yu 1009, survived war.
- Yu 1010, survived war.
- Yu 1011, incomplete until the end of the war.
- Yu 1012, incomplete until the end of the war.
- Yu 1013, incomplete until the end of the war.
- Yu 1014, incomplete until the end of the war.
Yu 2001 class
The Andō Iron Works-Tsukishima Factory build all of the Yu 2001-class boats. First boat (Yu-2001) was second prototype of the Yu I type boats. They fitted deck house root of the sail for improve comfort by builder's consideration.
- Yu 2001, survived war.
- Yu 2002, survived war.
- Yu 2003, incomplete until the end of the war.
- Yu 2004, incomplete until the end of the war.
- Yu 2005, incomplete until the end of the war.
- Yu 2006, incomplete until the end of the war.
Yu 3001 class
The Chōsen Machinery-Jinsen Factory build all of the Yu 3001-class boats.
- Yu 3001, survived war.
- Yu 3002, sunk by rough weather in 1945.
- Yu 3003, survived war.
- Yu 3005, incomplete until the end of the war.
- Yu 3006, incomplete until the end of the war.
- Yu 3007, incomplete until the end of the war.
- Yu 3008, incomplete until the end of the war.
- Yu 3009, incomplete until the end of the war.
- Yu 3010, incomplete until the end of the war.
Yu II type
Improved model of the Yu I type. Yu II was built by Kampon technical guidance. The IJN used the Ha-101-class submarine drawings and designed this.
- Ushio, prototype of the Yu II type, laid down in August 1944, launched on 16 May 1945, completed on 18 August 1945.
- ^ Atsumi Nakashima, p.130
See also
Bibliography
- Rekishi Gunzō, History of Pacific War Extra, Perfect guide, The submarines of the Imperial Japanese Forces, Gakken (Japanese publisher), March 2005, ISBN 4-05-603890-2
- Rekishi Gunzō, History of Pacific War Vol.45, Truth histories of the Imperial Japanese Naval Vessels, Gakken (Japanese publisher), May 2004, ISBN 4-05-603412-5
- Ships of the World No.506, Kaijinsha (Japanese publisher), February 1996
- The Maru Special, Japanese Naval Vessels No.43 Japanese Submarines III, Ushio Shobō (Japanese publisher), September 1980
- Atsumi Nakashima, Army Submarine Fleet, "The secret project !, The men challenged the deep sea", Shinjinbutsu Ōraisha (Japanese publisher), August 2006, ISBN 4-404-03413-X