F-class submarines
F-class submarines statistics:
| Number completed before 1919 | 3 |
| Number completed after 1919 | 0 |
| Lost in action | 0 |
| Lost accidentally | 0 |
| Prototype date | 1915 |
| Surface tonnage | 353 |
| Submerged tonnage | 525 |
| Length | 151 feet |
| Engine | Diesel |
| Horsepower | 900 |
| Screws | 2 |
| Surface speed | 14.5 knots |
| Submerged speed | 9 knots |
| Torpedo tubes | 18 inches |
| Number of torpedoes tubes | 3 |
| Guns | 1 |
| Crew | 18 to 20 |
