Type A1 submarine

I-10 in Penang, 1942
Class overview
Operators	Imperial Japanese Navy
Preceded by	Type J3 submarine
Succeeded by	Type A2 submarine
Built	1939–1942
In service	1941–1944
Planned	5
Completed	3
Cancelled	2
Lost	3
General characteristics
Type	Cruiser submarine
Displacement	2,966 t (2,919 long tons) (surfaced) 4,195 t (4,129 long tons) (submerged)
Length	113.7 m (373 ft) (o/a)
Beam	9.5 m (31 ft 2 in)
Draft	5.3 m (17 ft 5 in)
Installed power	12,400 bhp (9,200 kW) (diesel) 2,400 shp (1,800 kW) (electric motor)
Propulsion	Diesel-electric 2 × diesel engines 2 × electric motors
Speed	23.5 knots (43.5 km/h; 27.0 mph) (surfaced) 8 knots (15 km/h; 9.2 mph) (submerged)
Range	16,000 nmi (30,000 km; 18,000 mi) at 16 knots (30 km/h; 18 mph) (surfaced) 60 nmi (110 km; 69 mi) at 3 knots (5.6 km/h; 3.5 mph) (submerged)
Test depth	100 m (330 ft)
Crew	100
Armament	6 × bow 533 mm (21 in) torpedo tubes 1 × 14 cm (5.5 in) deck gun 2 × twin 25 mm (1 in) AA guns
Aircraft carried	1 × Yokosuka E14Y seaplane
Aviation facilities	1 × catapult

The Type A1 submarine (巡潜甲型潜水艦, Junsen kō-gata sensuikan, "Cruiser submarine type A"), also called I-9-class submarine (伊九型潜水艦, I-kyū-gata sensuikan) were a trio of aircraft-carrying cruiser submarines built for the Imperial Japanese Navy (IJN) during the 1930s. All three participated in the Pacific War and were lost.