Ha-101-class submarine

The Ha-101-class submarine (波百一型潜水艦, Ha-hyaku-ichi-gata Sensuikan) was a transport submarine built for the Imperial Japanese Navy (IJN) during World War II. The IJN planned to build 12 boats, but only 10 vessels were completed by the end of the war. The IJN called these submarines Sen'yu-Shō type submarine (潜輸小型潜水艦, Sen-Yu-Ko-gata sensuikan). The type name, was shortened to Yusō Sensuikan Ko-gata (輸送潜水艦小型, Transport Submarine-Small Type).[2]

(left to right) Ibuki, Ha-105, Ha-106 and Ha-109
Class overview
NameHa-101-class submarine
Builders
Operators Imperial Japanese Navy
Cost2,135,000 JPY[1]
Built1944–45
In commission1944–45
Planned12
Completed10
Scrapped10
General characteristics
TypeTransport submarine
Displacement
  • 436 t (429 long tons) surfaced
  • 501 t (493 long tons) submerged
Length44.5 m (146 ft 0 in)
Beam6.1 m (20 ft 0 in)
Draft4.04 m (13 ft 3 in)
Installed power
Propulsion
Speed
  • 10 knots (19 km/h; 12 mph) surfaced
  • 5 knots (9.3 km/h; 5.8 mph) submerged
Range
  • 3,000 nmi (5,600 km; 3,500 mi) at 10 knots (19 km/h; 12 mph) surfaced
  • 46 nmi (85 km; 53 mi) at 2.3 knots (4.3 km/h; 2.6 mph) submerged
Test depth100 meters (328 ft)
Capacity60 metric tons (59 long tons)
Complement22
Armament1 × single 25 mm (1 in) Type 96 anti-aircraft gun

Several boats were converted to tankers or mother ships for the Kō-hyōteki model D "Kōryū" (甲標的丁型 蛟龍) midget submarines.

Design and description

The Ha-101-class submarines were designed as small, cheap transport submarines to resupply isolated island garrisons. They displaced 436 metric tons (429 long tons) surfaced and 501 metric tons (493 long tons) submerged. The submarines were 44.5 meters (146 ft 0 in) long, had a beam of 6.1 meters (20 ft 0 in) and a draft of 4.04 meters (13 ft 3 in). They were designed to carry 60 metric tons (59 long tons) of cargo.[3]

For surface running, the boats were powered by a single 400-brake-horsepower (298 kW) diesel engine that drove one propeller shaft. When submerged the propeller was driven by a 140-horsepower (104 kW) electric motor. They could reach 10 knots (19 km/h; 12 mph) on the surface and 5 knots (9.3 km/h; 5.8 mph) underwater.[4] On the surface, the Ha-101s had a range of 3,000 nautical miles (5,600 km; 3,500 mi) at 10 knots (19 km/h; 12 mph); submerged, they had a range of 46 nmi (85 km; 53 mi) at 2.3 knots (4.3 km/h; 2.6 mph). The boats were armed a single mount for a 25 mm (1 in) Type 96 anti-aircraft gun.[5]

Planned construction

Project number S57. In February 1944, the IJN planned a small-size transport submarine, the IJA planned the Maru Yu.

Boats
Boat # Name Builder Laid down Launched Completed Decommissioned Fate
4601 Ha-101[6] Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 08-06-1944 22-08-1944 22-11-1944 15-09-1945 Converted to a tanker submarine in June 1945;[7] scuttled off Shimizu City October 1945
4602 Ha-102 Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 08-06-1944 22-08-1944 06-12-1944 15-09-1945 Converted to a tanker submarine in June 1945; scuttled off Shimizu City October 1945
4603 Ha-103 Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 29-06-1944 21-10-1944 03-02-1945 30-11-1945 Converted to a radar picket submarine April 1945; re-converted to a tanker submarine in June 1945; scuttled off the Gotō Islands 01-04-1946
4604 Ha-104 Kawasaki-Kōbe Shipyard 01-07-1944 30-09-1944 01-12-1944 15-09-1945 Converted to a tanker submarine June 1945; scuttled off Shimizu City October 1945
4605 Ha-105 Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 29-06-1944 31-10-1944 19-02-1945 30-11-1945 Converted to a radar picket submarine in March or April 1945; re-converted to a tanker submarine in June 1945; scuttled off the Gotō Islands 01-04-1946
4606 Ha-106 Mitsubishi-Kōbe Shipyard 01-07-1944 30-10-1944 15-12-1944 30-11-1945 Converted to Kōryū mother ship June 1945; scuttled off the Gotō Islands 01-04-1946
4607 Ha-107 Mitsubishi-Kōbe Shipyard 01-08-1944 20-12-1944 20-03-1945 30-11-1945 Converted to Kōryū mother ship June 1945; scuttled off the Gotō Islands 01-04-1946
4608 Ha-108 Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 05-09-1944 28-12-1944 06-05-1945 30-11-1945 Converted to Kōryū mother ship June 1945; scuttled off the Gotō Islands 01-04-1946
4609 Ha-109 Mitsubishi-Kōbe Shipyard 01-08-1944 10-01-1945 10-03-1945 30-11-1945 Converted to Kairyu-class submarine's tender July 1945; scuttled off the Gotō Islands 01-04-1946
4610 Ha-110 Kawasaki-Senshū Shipyard,
Kawasaki-Kōbe Shipyard
 05-09-1944 12-01-1945 95% complete; scuttled in the Kii Channel 15-04-1946
4611 Ha-111 Mitsubishi-Kōbe Shipyard 16-11-1944 02-03-1945 13-07-1945 30-11-1945 scuttled off the Gotō Islands 01-04-1946
4612 Ha-112 Mitsubishi-Kōbe Shipyard 16-11-1944 15-04-1945 95% complete; scuttled in the Kii Channel 15-04-1946

See also

Footnotes
  1. Senshi Sōsho Vol.88 (1975), p.96
  2. The 潜輸小 read as "Sen'yu-Shō", but the 潜輸小型 read as "Sen'yu-Ko-gata" in Japanese.
  3. Carpenter & Dorr, p. 140
  4. Chesneau, p. 204
  5. Bagnasco, p. 195
  6. 波号第101潜水艦 (Ha-Gō Dai-101 Sensuikan). The same shall apply hereinafter.
  7. Senshi Sōsho Vol.88 (1975), p.272–273

Bibliography
  • Bagnasco, Erminio (1977). Submarines of World War Two. Annapolis, Maryland: Naval Institute Press. ISBN 0-87021-962-6.
  • Carpenter, Dorr B. & Polmar, Norman (1986). Submarines of the Imperial Japanese Navy 1904–1945. London: Conway Maritime Press. ISBN 0-85177-396-6.
  • Chesneau, Roger, ed. (1980). Conway's All the World's Fighting Ships 1922–1946. Greenwich, UK: Conway Maritime Press. ISBN 0-85177-146-7.
  • "Rekishi Gunzō"., History of Pacific War Extra, "Perfect guide, The submarines of the Imperial Japanese Forces", Gakken (Japan), March 2005, ISBN 4-05-603890-2
  • Ships of the World special issue Vol.37, History of Japanese Submarines, "Kaijinsha"., (Japan), August 1993
  • The Maru Special, Japanese Naval Vessels No.43 Japanese Submarines III, Ushio Shobō (Japan), September 1980, Book code 68343-43
  • The Maru Special, Japanese Naval Vessels No.132 Japanese Submarines I "Revised edition", Ushio Shobō (Japan), February 1988, Book code 68344-36
  • Senshi Sōsho Vol.88, Naval armaments and war preparation (2), "And after the outbreak of war", Asagumo Simbun (Japan), October 1975
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