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:	1944–45
In commission:	1944–45
Planned:	12
Completed:	10
Scrapped:	10
General characteristics
Type:	Transport submarine
Displacement:	436 t (429 long tons) surfaced 501 t (493 long tons) submerged
Length:	44.5 m (146 ft 0 in)
Beam:	6.1 m (20 ft 0 in)
Draft:	4.04 m (13 ft 3 in)
Installed power:	400 bhp (300 kW) (diesels) 150 hp (110 kW) (electric motor)
Propulsion:	Diesel-electric 1 × diesel engines 1 × electric motor
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 depth:	100 meters (328 ft)
Capacity:	60 metric tons (59 long tons)
Complement:	22
Armament:	1 × single 25 mm (1 in) Type 96 anti-aircraft gun

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^?).

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

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.