Summary
The Highflyer-class corvettes were a pair of 21-gun wooden screw corvettes built in the 1850s for the Royal Navy.
 Profile of Highflyer dated 1863
| |
| Class overview | |
|---|---|
| Name | Highflyer class |
| Operators |  Royal Navy |
| Preceded by | Nil |
| Succeeded by | HMS Pylades |
| Built | 1851-1854 |
| In service | 1852-1871 |
| Completed | 2 |
| Scrapped | 2 |
| General characteristics [1] | |
| Type | Wooden screw corvette |
| Displacement | 1,737+1⁄2 tons |
| Tons burthen | 1,153 bm |
| Length | |
| Beam | 36 ft 4 in (11.07 m) |
| Draught | 15 ft 9 in (4.80 m) |
| Depth of hold | 22 ft 8 in (6.91 m) |
| Installed power | |
| Propulsion |
|
| Sail plan | Full-rigged ship |
| Speed | 9.4 kn (17.4 km/h) under steam |
| Armament |
|
Design edit
Highflyer was ordered as a small wooden frigate to a design by the Surveyor's Department of the Admiralty on 25 April 1847; she and her sister Esk were re-designated as corvettes in 1854. These ships were envisaged as steam auxiliaries, intended to cruise under sail with the steam engine available for assistance. Commensurately they were provided with a full square sailing rig. Esk was built in exchange for HMS Greenock (which went to the Australian Royal Mail Co.) The words of the Admiralty Order stated she should be "a wood screw vessel complete of Highflyer's [class] in exchange when built".[1]
Propulsion edit
Highflyer was given a geared two-cylinder horizontal single-expansion steam engine, provided by Maudslay, Sons & Field, which developed 702 indicated horsepower (523 kW) and drove a single screw.[1] Esk was provided with an oscillating two-cylinder inclined single-expansion steam engine, provided by the builders, was quite different from Highflyer's, but developed broadly the same power — 657 indicated horsepower (490 kW) — and drove a single screw.[1]
Armament edit
The class was a 21-gun corvette, mounting twenty 32-pounder (42cwt) long guns in a broadside arrangement, and a single 10-inch 84-pounder (85cwt) gun on a pivot. Both ships later swapped their broadside 32-pounders for eighteen 8-inch guns.[1]
Construction edit
Highflyer was built at Leamouth Wharf by C J Mare & Co., while Esk was ordered from the Millwall yard of J. Scott Russell & Co. on the River Thames.[1]
Ships edit
| Ship | Builder | Laid down | Launched | Completed | Fate |
|---|---|---|---|---|---|
| Highflyer | C J Mare & Co.[1] | January 1850[1] | 13 August 1851[1] | 10 April 1852[1] | Broken up, May 1871[1] |
| Esk | J. Scott Russell & Co.[1] | April 1853[1] | 12 June 1854[1] | 21 December 1854[1] | Broken up, 1870[1] |