Cachalot 1915
| Name | No | Builder | Laid down | Launched | Comp | Fate |
| Zedwhale (ex-Z1) | Smiths Dock, South Bank | 1915 | 29/5/1915 | 8/1915 | sold 2/1920 | |
| Balena (ex-Z2) | Smiths Dock, South Bank | 1915 | 29/5/1915 | 8/1915 | sold 4/1920 | |
| Beluga (ex-Z3) | Smiths Dock, South Bank | 1915 | 26/6/1915 | 8/1915 | sold 4/1920 | |
| Bowhead (ex-Z4) | Smiths Dock, South Bank | 1915 | 26/6/1915 | 8/1915 | sold 4/1920 | |
| Blackwhale (ex-Z5) | Smiths Dock, South Bank | 1915 | 28/6/1915 | 8/1915 | sunk 3/1/1918 | |
| Bullwhale (ex-Z6) | Smiths Dock, South Bank | 1915 | 28/6/1915 | 9/1915 | sold 3/1920 | |
| Cachalot (ex-Z7) | Smiths Dock, South Bank | 1915 | 28/7/1915 | 9/1915 | sold 1933 | |
| Cowwhale (ex-Z8) | Smiths Dock, South Bank | 1915 | 28/7/1915 | 9/1915 | sold 3/1920 | |
| Humpback (ex-Z9) | Smiths Dock, South Bank | 1915 | 12/8/1915 | 10/1915 | sold 3/1920 | |
| Rorqual (ex-Z10) | Smiths Dock, South Bank | 1915 | 12/8/1915 | 10/1915 | sold 3/1920 | |
| Rightwhale (ex-Z11) | Smiths Dock, South Bank | 1915 | 10/9/1915 | 10/1915 | sold 3/1920 | |
| Icewhale (ex-Z12) | Smiths Dock, South Bank | 1915 | 10/9/1915 | 10/1915 | base ship Osprey 3/1924 | |
| Finwhale (ex-Z13) | Smiths Dock, South Bank | 1915 | 24/9/1915 | 10/1915 | sold 3/1920 | |
| Pilotwhale (ex-Z14) | Smiths Dock, South Bank | 1915 | 24/9/1915 | 11/1915 | sold 4/1920 | |
| Arctic Whale (ex-Z15) | Smiths Dock, South Bank | 1915 | 7/10/1915 | 11/1915 | sold 4/1920 |
|
Displacement normal, t |
336 |
|
Displacement full, t |
346 |
|
Length, m |
40.5 |
|
Breadth, m |
7.60 |
|
Draught, m |
2.60 |
|
No of shafts |
1 |
|
Machinery |
VTE, 2 White-Forster boilers |
|
Power, h. p. |
1200 |
|
Max speed, kts |
13 |
|
Fuel, t |
coal 60 |
|
Armament |
1 x 1 - 76/50 QF Mk I Zedwhale: 1 x 1 - 76/40 QF Mk I, 1 x 1 - 57/40 Hotchkiss HA |
|
Complement |
26 |
Ship project history: Small submarine chasers in whaler hull intended to patrol, escort, anti-submarine duties. Can be used as decoys. They had good manoeuvrability but very poor seaworthiness and appeared not successful.
Modernizations: 1916, all: + 1 DCT (2)
1917 - 1918, all survived: may be + 1 DCT, DC stowage was presumably increased
Naval service: Blackwhale was mined.
© Ivan Gogin, 2008-10