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| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
|---|---|---|---|---|---|---|---|
| 第71号艦 [71-go] | Kure K K | 12.1937 | 13.8.1938 | 8.1938 | BU 1940 |
| Displacement standard, t | 195 |
|---|---|
| Displacement normal, t | 213 / 240 |
| Length, m | 42.8 |
| Breadth, m | 3.30 |
| Draught, m | 3.10 |
| No of shafts | 1 |
| Machinery | 1 Kampon diesel / 1 electric motor |
| Power, h. p. | 300 / 1800 |
| Max speed, kts | 13.1 / 21.3 |
| Fuel, t | diesel oil 30 |
| Endurance, nm(kts) | 3830(12.5) / 33(7) |
| Armament | 3 - 450 TT (bow, 3) |
| Complement | 11 |
| Diving depth operational, m | 85 |
Experimental boat with camouflage designation Maru No71 (vessel No71). First Japanese submarine built for maximum submerged speed. Single-hulled
None.
No71 was scrapped after completion of trials.

