Frolic-class gunvessel

The Frolic-class gunvessels were a class of composite gunboats built for the Royal Navy in the early 1870s. They were generally deployed overseas to the East Indies, West Africa, and China Stations. In addition to showing the flag, the ships fought pirates and suppressed the slave trade in East Africa. They were placed in reserve in the mid-1880s, and two of them were sold for scrap by the end of the decade. The other pair survived for longer as they were either modified for harbour service or became a training ship before being sold or scrapped. The last survivor, Ready, was used in support of William Beebe's expedition in his bathysphere in 1930 near Bermuda.

Design and description
The four ships of the Frolic class were repeats of the preceding Beacon class despite being begun four years later. The ships were 155 ft long between perpendiculars and had a beam of 25 ft. Forward, the ships had a draught of 7 ft, but aft they drew 9 ft. They displaced 610 LT as built and had a burthen of 462 tons. The depth of hold was 11 ft and the hull was subdivided by watertight bulkheads. Their crew consisted of 80 officers and enlisted men.

The supply of engines from the old Crimean War gunboats had been exhausted by that time and they were given brand-new engines. Unlike their half sisters, these ships received new compound-expansion trunk steam engines from John Penn and Sons. Each engine powered a single 6 ft propeller. The engines produced between 715 and 896 ihp which gave the ships a maximum speed between 10 and 11 kn. The new engines proved to be more powerful than those used in the Beacons, but they were as uneconomical as the simple steam engines used in the older ships and fell from favour as a result. Three cylindrical boilers provided steam to the engines at a working pressure of 80 psi. The ships carried 80 LT of coal which gave them a range of 880 nmi at 10 knots.

The hull shape of the Frolics was identical to that of their predecessors and they had a very full hull shape with squared-off bilges and a flat bottom. Admiral G. A. Ballard commented that they were built "along the lines of an extremely elongated packing crate." This made them steady gun platforms and gave them quite a bit of buoyancy. If they ran aground, this shape allowed them to be pulled off easily and they remained upright if stranded by a receding tide. However, this hull shape made their steering erratic at low speeds or in a following sea and they made a large amount of leeway in a strong side breeze.

The class was barque rigged and their best speed under sail alone was over 12 kn if running before the wind, despite the drag of the propellers, which could neither be hoisted out of the water, nor feathered. In a headwind, Ballard described them as "quite unmanageable under sail alone" because of their shallow draft and flat bottom. Their funnels were hinged to lower horizontally to reduce wind resistance while under sail. A poop deck was added in between commissions, but this was the only major structural change made during their careers.

The ships were initially armed with a mix of 7-inch and 64-pounder 56 cwt rifled muzzle-loading guns and a pair of 20-pounder rifled breechloading guns. The 7 in and 64-pounder guns were mounted on the centreline as pivot guns while the two 20-pounder guns were mounted at the bow and stern as chase guns. The 16-calibre 7-inch gun weighed 6.5 LT and fired a 112 lb shell. It was credited with the nominal ability to penetrate 7.7 in armour. A lighter, 4.5 LT, 7-inch gun developed in the 1870s replaced the heavier gun in Frolic and it replaced both heavy guns in Rifleman.

Service
These ships were primarily designed for service in Southeast Asian waters, including the rivers, and Frolic and Kestrel spent at least one commission there. Their duties included protecting British lives and property and fighting pirates. Another major deployment area was the Gulf of Guinea in West Africa where Frolic and Rifleman served part of one or more commissions. Frolic, Ready, and Rifleman served at least one commission off the south-east coast of South America. Kestrel, Ready, and Rifleman each made one or more deployment to the East Indies Station where they helped to suppress the slave trade between East Africa and the Persian Gulf. At the beginning of the Anglo-Egyptian War of 1882, Ready seized the assets of the Suez Canal Company, including its dredgers. At the end of 1873, Kestrel was on the China Station, Ready off South America, and Rifleman in the East Indies. A few months later, Frolic was one of the ships that blockaded the mouth of the Klang River in Malaysia in an attempt to suppress piracy supported by the local sultan. Together with the survey ship HMS Nassau (1866), Rifleman helped to suppress a rebellion in Mombasa against the British-supported Sultan of Zanzibar in 1875.

All four ships were placed in reserve in the mid-1880s and Kestrel and Rifleman were sold in 1888 and 1890 respectively. Frolic became a training ship for the Royal Navy Volunteer Reserve in 1888 before being assigned to the Coastguard in 1893 as Watch Vessel W.V.30 and later W.V.41. She was sold for scrap on 7 April 1908. Ready was converted into a tank vessel in 1894, renamed Drudge in October 1916 and sold in Bermuda on 25 February 1920. Her new owners converted her to a lighter and she carried the winch that hoisted William Beebe's bathysphere up and down in 1930. Her ultimate fate is unknown.