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HMS Sirius
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| Class overview | |
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| Name: | |
| Builders: |
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| Operators: |
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| Preceded by: | Amazon class |
| Succeeded by: | Fantome class |
| Built: | 1867–1870 |
| In service: | 1867–1921 |
| Completed: | 7 |
| Scrapped: | 7 |
| General characteristics (as built) | |
| Type: | Wooden screw sloop (later corvette) |
| Displacement: | 1,760 long tons (1,790 t) |
| Tons burthen: | 1,268 bm |
| Length: | 212 ft (64.6 m) (p/p) |
| Beam: | 36 ft (11.0 m) |
| Draught: | 16 ft 6 in (5.0 m) |
| Depth: | 21 ft 6 in (6.6 m) |
| Installed power: | 1,946–2,518 ihp (1,451–1,878 kW) |
| Propulsion: |
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| Sail plan: | Barque or Ship rig |
| Speed: | 12–13 knots (22–24 km/h; 14–15 mph) |
| Complement: | 180 |
| Armament: |
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The Eclipse class was a class of seven 6-gun wooden screw sloops built for the Royal Navy between 1867 and 1870. They were re-armed and re-classified as 12-gun corvettes in 1876. Two further vessels were proposed but never ordered.
A development of the Amazon class, they were designed by Edward Reed, the Royal Navy's Director of Naval Construction. The hull was of wooden construction, but with iron cross-beams, and a ram bow was fitted.
Propulsion was provided by a two-cylinder horizontal steam engine driving a single screw. Spartan, Sirius and Tenedos had compound steam engines, and the remainder of the class had single-expansion steam engines.
All the ships of the class were built with a ship rig, but this was replaced with a barque rig.
The Eclipse class was designed with two 7-inch (6½-ton) muzzle-loading rifled guns mounted in traversing slides and four 64-pounder muzzle-loading rifled guns. They were re-classified as corvettes in 1876, carrying a homogenous armament of twelve 64-pounder muzzle-loading rifled guns.