| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Buttermere (ex-Kos XXV) | FY205 | 1062 | Smiths Dock, South Bank | 30.6.1939 | 10.1939 | to USA 3.1942 - 10.1942 (Buttermere), sold 5.1946 | |
| Ellesmere (ex-Kos XXIV) | FY204 | 1061 | Smiths Dock, South Bank | 17.6.1939 | 10.1939 | sunk 24.2.1945 | |
| Grassmere (ex-Kos XXVIII), 1940 - Wastwater | FY239 | 1065 | Smiths Dock, South Bank | 31.8.1939 | 11.1939 | sold 5.1946 | |
| Thirlmere (ex-Kos XXVI) | FY206 | 1063 | Smiths Dock, South Bank | 5.7.1939 | 10.1939 | sold 5.1946 | |
| Ullswater (ex-Kos XXIX) | FY252 | 1074 | Smiths Dock, South Bank | 31.8.1939 | 11.1939 | sunk 9.11.1942 | |
| Windermere (ex-Kos XXVII) | FY207 | 1064 | Smiths Dock, South Bank | 21.7.1939 | 11.1939 | sold 1947 |
|
Displacement standard, t |
560 |
|
Displacement full, t |
|
|
Length, m |
48.9 |
|
Breadth, m |
8.46 |
|
Draught, m |
4.65 |
|
No of shafts |
1 |
|
Machinery |
1 VTE, 1 cylindrical boiler |
|
Power, h. p. |
1400 |
|
Max speed, kts |
13.8 |
|
Fuel, t |
coal |
| Endurance, nm(kts) | |
|
Armament |
1 x 1 - 76/40 12pdr 12cwt QF Mk I/II/V, 1 x 2 - 12.7/62, 1 x 1 - 12.7/62, mechanical minesweeping gear |
|
Complement |
35 |
Project history: Minesweeping whalers, purchased by Admiralty on the stocks.
Modernizations: 1942 - 1943, all survived: - 1 x 1 - 12.7/62; + 1 x 1 - 20/70 Oerlikon Mk II/IV, type 271 (some), type 290 (some) radars
Naval service: Ellesmere was sunk by German submarine U1203 and Ullswater by German MTB.
Ellesmere 1941
Many thanks to Wolfgang Stöhr for additional information on this page.
© Ivan Gogin, 2008-10