R-class submarine
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 |
