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| R-class submarines
statistics:
| Number
completed before 1919 |
10 |
| Number
completed after 1919 |
0 |
| Lost
in action |
0 |
| Lost
accidentally |
0 |
| Prototype
date |
1918 |
| Surface
tonnage |
420 |
| Submerged
tonnage |
500 |
| Length |
163
feet |
| Engine |
Diesel |
| Horsepower |
2,400 |
| Screws |
1 |
| Surface
speed |
9.5
knots |
| Submerged
speed |
15
knots |
| Torpedo
tubes |
18
inches |
| Number
of torpedoes tubes |
6 |
| Guns |
1
x 4 inches |
| Crew |
22 |
 |

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