Type A1 submarine
I-10 in Penang, 1942
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| Class overview | |
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| Operators: |
 Imperial Japanese Navy
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| Preceded by: | Type J3 submarine |
| Succeeded by: | Type A2 submarine |
| Built: | 1939–42 |
| In service: | 1941–44 |
| Planned: | 5 |
| Completed: | 3 |
| Cancelled: | 2 |
| Lost: | 3 |
| General characteristics | |
| Type: | Cruiser submarine |
| Displacement: |
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| Length: | 113.7 m (373 ft 0 in) overall |
| Beam: | 9.5 m (31 ft 2 in) |
| Draft: | 5.3 m (17 ft 5 in) |
| Installed power: |
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| Propulsion: |
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| Speed: |
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| Range: |
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| Test depth: | 100 m (330 ft) |
| Crew: | 100 |
| Armament: |
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| 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.
The submarines of the A1 type were versions of the preceding J3 class with superior range, improved aircraft installation. Unlike the earlier boats, they were equipped with extensive communication facilities to allow them to serve as squadron flagships. They displaced 2,966 tonnes (2,919 long tons) surfaced and 4,195 tonnes (4,129 long tons) submerged. The submarines were 113.7 meters (373 ft 0 in) long, had a beam of 9.5 meters (31 ft 2 in) and a draft of 5.3 meters (17 ft 5 in). They had a diving depth of 100 meters (330 ft).
For surface running, the boats were powered by two 6,200-brake-horsepower (4,623 kW) diesel engines, each driving one propeller shaft. When submerged each propeller was driven by a 1,200-horsepower (895 kW) electric motor. They could reach 19 knots (35 km/h; 22 mph) on the surface and 8.25 knots (15.28 km/h; 9.49 mph) underwater. On the surface, the A1s had a range of 16,000 nautical miles (30,000 km; 18,000 mi) at 16 knots (30 km/h; 18 mph); submerged, they had a range of 90 nmi (170 km; 100 mi) at 3 knots (5.6 km/h; 3.5 mph).
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Wikipedia