| Name | No | Yard No | Builder | Laid down | Launched | Comp | Fate |
| Alecto | Chatham DYd | 7.1839 | 7.9.1839 | 12.12.1839 | BU 11.1865 | ||
| Prometheus | Sheerness DYd | 7.1839 | 21.9.1839 | 20.2.1840 | sold 1863 | ||
| Polyphemus | Chatham DYd | 2.1840 | 28.9.1840 | 24.4.1841 | wrecked 29.1.1856 | ||
| Ardent | Chatham DYd | 2.1840 | 12.2.1841 | 16.9.1842 | BU 3.1865 |
|
Displacement normal, t |
878 |
|
Displacement full, t |
|
|
Length, m |
50.0 pp |
|
Breadth, m |
9.96 |
|
Draught, m |
2.26 |
|
No of shafts |
2 side wheels |
|
Machinery |
sails + boilers, 1 2-cyl DA |
|
Power, h. p. |
370ihp |
|
Max speed, kts |
8.5-9.5 |
|
Fuel, t |
coal |
|
Endurance, nm(kts) |
|
|
Armament |
2 x 1 - 161/16 32pdr 45cwt SBML, 2 x 1 - 160/11 32pdr 25cwt SBML |
|
Complement |
Project history: 3rd rate steam vessels, since 1844 3rd class sloops. Sir William Symonds design, approved in 1839. Rattler was reordered as screw ship, Argus was reordered to new design.
Modernizations: None.
Naval service: Polyphemus wrecked on a steep sandy beach 7nm from Hansholme on the Baltic coast of Jutland 29.1.1856.
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