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| J-class submarines
statistics:
| Number
completed before 1919 |
7 |
| Number
completed after 1919 |
0 |
| Lost
in action |
0 |
| Lost
accidentally |
1 |
| Prototype
date |
1916 |
| Surface
tonnage |
1210 |
| Submerged
tonnage |
1820 |
| Length |
275
feet |
| Engine |
Diesel |
| Horsepower |
3,600 |
| Screws |
3 |
| Surface
speed |
19.5
knots |
| Submerged
speed |
9.5
knots |
| Torpedo
tubes |
18
inches |
| Number
of torpedoes tubes |
6 |
| Guns |
2
x 3 inches |
| Crew |
44 |
 |

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