Osprey class sloop
Cormorant c.1878
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| Class overview | |
|---|---|
| Name: | Osprey-class sloop |
| Operators: |
 Royal Navy
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| Cost: | Between £49,217 (Cormorant) and £56,221 (Pelican) |
| Built: | 1874–1877 |
| In commission: | 1874–1949 |
| Completed: | 5 |
| Scrapped: | 5 |
| General characteristics | |
| Type: | Screw composite sloop |
| Displacement: | 1,130 long tons (1,150 t) |
| Length: | 170 ft (51.8 m) (p/p) |
| Beam: | 36 ft (11.0 m) |
| Draught: | 15 ft 9 in (4.8 m) |
| Depth: | 19 ft 6 in (5.9 m) |
| Installed power: | 666–1,056 ihp (497–787 kW) |
| Propulsion: |
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| Sail plan: | Barque rig |
| Speed: | 9–12 knots (17–22 km/h; 10–14 mph) |
| Range: | 1,480 nmi (2,740 km; 1,700 mi) at 10 knots (19 km/h; 12 mph) |
| Complement: | 140 |
| Armament: |
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The Osprey class was a Royal Navy class of screw-driven sloops built between 1874 and 1877. Nine additional ships were built to a revised design, the Doterel-class sloop. They were the first class of ship in the Royal Navy to use glass .
They were of composite construction, with wooden hulls over an iron frame. Five ships of the class were built, which had been designed in 1874 by the Royal Navy's Chief Constructor, William Henry White. They were the first ships in the Royal Navy to have glass instead of solid plug scuttles.
The original design, as fitted to the first two ships of the class, was a single-expansion returning-rod steam engine, but the power was insufficient, and they failed to meet the contracted speed. Wild Swan and Penguin were re-engined after their first commission to match the better engines in the rest of the class. In the final installation, power was provided by three cylindrical boilers, which supplied steam at 60 pounds per square inch (410 kPa) to a two-cylinder horizontal compound-expansion steam engine driving a single 13-foot-1-inch (3.99 m) screw. The power varied wildly from ship to ship, with Penguin generating only 666 indicated horsepower (497 kW) and Pelican managing nearly twice as much, at 1,056 indicated horsepower (787 kW). Because of this, top speeds ranged between 10 and 12 knots.
They were armed with two 7-inch (90cwt) muzzle-loading rifled guns on pivoting mounts, and four 64-pounder muzzle-loading rifled guns (two on pivoting mounts, and two broadside). Four machine guns and one light gun completed the weaponry. Wild Swan and Pelican later had the muzzle-loading guns replaced with two 6-inch (81cwt) breech-loaders and six 5-inch (31cwt) breech-loaders.
All the ships of the class were provided with a barque rig, that is, square-rigged foremast and mainmast, and fore-and-aft sails only on the mizzen mast.
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