F1 1915
| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| F1 | IA0 | Chatham DYd | 12.1913 | 31.3.1915 | 8.1915 | BU 1920 | |
| F2 | IA1 | White, Cowes | 11.1914 | 7.7.1917 | 8/1917 | sold 7.1922 | |
| F3 | IA2 | Thornycroft, Woolston | 10.1914 | 19.2.1916 | 7.1916 | BU 1920 |
|
Displacement standard, t |
|
|
Displacement normal, t |
363 / 525 |
|
Length, m |
46.0 |
|
Breadth, m |
4.91 |
|
Draught, m |
3.23 |
|
No of shafts |
2 |
|
Machinery |
F1, 3: 2 Vickers diesels / 2 electric motors F2: 2 6-cyl Nuremberg (MAN)-White diesels / 2 electric motors |
|
Power, h. p. |
900 / 400 |
|
Max speed, kts |
14 / 8.75 |
|
Fuel, t |
diesel oil |
| Endurance, nm(kts) | 3000(9.5) / |
|
Armament |
3 - 450 TT (2 bow, 1 stern, 6), |
|
Complement |
19 |
| Diving depth operational, m | 30 |
Project history: Standard Admiralty coastal design built for comparison with the 'S', 'V and 'W' types. Like them had double-hull features, and was based largely on the 'V' design, with improvements such as a stern TT. The Admiralty was most anxious to encourage the building of diesel engines, and so while F1 had the standard Vickers type, F 2 had 6-cyl Nuremberg (MAN) type built under licence by J Samuel White, but F3 reverted to the Vickers type. The battery had 12S Exide cells. F1 was ordered under the 1913-14 Programme and laid down in January 1913. F2 and F3 came under the 1914-15 Programme. Another three, F4-6 were projected in 1914 but cancelled after war broke out. Being very small these submarines saw relatively little service, apart from local defence.
Modernizations: None.
Naval service: No significant events.
F2 1917
© Ivan Gogin, 2008-13