Ha-101-class submarine

Ha-101-class submarine
(left to right) Ibuki, Ha-105, Ha-106 and Ha-109
Class overview
Name:	Ha-101 class submarine
Builders:	Kawasaki Shipbuilding Mitsubishi Heavy Industries
Operators:	Imperial Japanese Navy
Cost:	2,135,000 JPY
Built:	1944–1945
In commission:	1944–1945
Planned:	12
Completed:	10
Retired:	10
General characteristics
Type:	Transport submarine
Displacement:	370 long tons (376 t) surfaced 493 long tons (501 t) submerged
Length:	44.50 m (146 ft 0 in) overall 42.20 m (138 ft 5 in) waterline
Beam:	6.10 m (20 ft 0 in)
Draft:	4.04 m (13 ft 3 in)
Propulsion:	1 × intermediate diesel 400 bhp surfaced 150 shp submerged single shaft
Speed:	10 knots (19 km/h) surfaced 5 knots (9.3 km/h) submerged
Range:	3,000 nmi (5,600 km) at 10 knots (19 km/h) surfaced 46 nmi (85 km) at 2.3 knots (4.3 km/h) submerged
Test depth:	100 m (330 ft)
Capacity:	As built • 60 tons freight Ha-101, Ha-102, Ha-103, Ha-104 and Ha-105 in July 1945 • 60 tons gasoline
Complement:	21
Armament:	• 1 × Type 96 25mm AA gun

The Ha-101 class submarine (波百一型潜水艦, Ha Hyakuichi-gata Sensuikan) was a transport submarine of the Imperial Japanese Navy (IJN), serving during late 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-Kogata (潜輸小型, Sensuikan Yusō-Kogata, Submarine Transport-Small Type). 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.

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	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; scuttled off Simizu 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 Simizu 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 Simizu 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 Kairyū'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

• Type 4 Ka-Tsu
• Imperial Japanese Army Railways and Shipping Section
• Type 3 submergence transport vehicle, Yu II type

Bibliography

• "Rekishi Gunzō". http://rekigun.net/. , 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". http://www.ships-net.co.jp/. , (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