W-class submarines
W-class submarines statistics:
| Number completed before 1919 | 4 |
| Number completed after 1919 | 0 |
| Lost in action | 0 |
| Lost accidentally | 0 |
| Prototype date | 1915 |
| Surface tonnage | 340 |
| Submerged tonnage | 508 |
| Length | 171 feet |
| Engine | Diesel |
| Horsepower | 650 |
| Screws | 2 |
| Surface speed | 13 knots |
| Submerged speed | 8.5 knots |
| Torpedo tubes | 18 inches |
| Number of torpedoes tubes | 2 |
| Guns | 1 |
| Crew | 19 |
