Dapper class gunboat

Class overview
The gunvessel Grinder chasing Russian boats in the Sea of Azov, 31 August 1855
Name:	Dapper class
Operators:	Royal Navy
Preceded by:	Gleaner class
Succeeded by:	Albacore class
Built:	1854–1855
In commission:	1855–1906
Completed:	20
General characteristics
Type:	'Crimean' gunboat
Tons burthen:	215 ⁵³⁄₉₄ tons bm
Length:	106 ft (32 m) (gundeck) 93 ft 2.5 in (28.410 m) (keel)
Beam:	22 ft 0 in (6.71 m)
Draught:	6 ft 9 in (2.06 m)
Installed power:	60 nominal horsepower 270 ihp (200 kW))
Propulsion:	2-cylinder horizontal single expansion steam engine Single screw
Speed:	7.5 kn (13.9 km/h)
Crew:	36
Armament:	1 × 68-pounder SBML gun 1 × 32-pounder SBML gun 2 × 24-pounder howitzers

The Dapper-class gunboat was a class of twenty gunboats built for the Royal Navy in 1854–55 for use in the Crimean War.

The Dapper class was designed by W.H. Walker (who also designed the preceding Gleaner class and the subsequent Albacore class). The ships were wooden-hulled, with steam power as well as sails, but of shallow draft for coastal bombardment in the shallow waters of the Baltic and Black Sea during the Crimean War.

Ten ships had two-cylinder horizontal single-expansion trunk steam engines built by John Penn and Sons, with two boilers. The other ten had two-cylinder horizontal single-expansion direct-acting steam engines built by Maudslay, Sons and Field, with three boilers. Both versions provided 60 nominal horsepower through a single screw, sufficient for 7.5 knots (13.9 km/h; 8.6 mph).

Ships of the class were armed with one 68-pounder smooth bore muzzle loading cannon (SBML), one 32-pounder SBML (originally two 68-pounder SBMLs were planned but the forward gun was substituted by a 32-pounder) and two 24-pounder howitzers.

...
Wikipedia