Fly-class brig-sloop
The Fly class were built for the Royal Navy as a class of 16-gun brig-sloops; an extra two carronades were added soon after completion. The class was designed by one of the Surveyors of the Navy - Sir John Henslow - and approved in 1805. The Admiralty ordered five vessels to this design in January 1805; it ordered two more in the summer, although this final pair were planked with hulls of pitch pine rather than the normal oak used in the first five.
Vessels
In the following table, the Fly class brig-sloops are listed in the order in which they were instructed to be built.| Name | Launched | Fate |
| Kite | 13 July 1805 | Sold for breaking 14 December 1815 |
| Sparrow | 29 July 1805 | Sold for breaking 17 October 1816 |
| Fly | 24 October 1805 | Wrecked off Anholt island on 28 February 1812 |
| Raven | 12 August 1805 | Sold for breaking 18 September 1816 |
| Wizard | November 1805 | Sold for breaking 17 October 1816 |
| Goshawk | 17 July 1806 | Wrecked off Barcelona 21 November 1811 |
| Challenger | 30 July 1806 | Captured by French off Île de Batz 12 March 1811 |