Design
Designed by the Admiralty, ''Viper'' was a half-sister to and , and all three were built mostly as experimental vessels. While ''Viper'' and ''Vixen'' were twin screw vessels, ''Waterwitch'' had a water-pump propulsion system. ''Vixen'' was almost identical to ''Viper'', but was of composite construction.Hull
''Viper'' was an armoured gunboat of the breastwork type. Her hull was of iron construction, with of teak backing. Vertical trunks were provided at the stern to lift the screws clear of the hull, thereby allowing a better hull-form for purely wind-driven sailing.Propulsion
She was equipped with two sets of 4-cylinder horizontal single-expansion steam engines, each set powering one of her two-bladed, 9 ft diameter Maudslay & Griffiths screws. In total she developed an horsepower#Indicated horsepower, indicated 696 horsepower, sufficient for a top speed of . Steam was provided by two Maudslay iron fire-tube boilers with six furnaces.Sail plan
She was equipped with a barquentine rig, but in 1873 all masts, rigging and upper deck obstructions were removed after the decision for ''Vixen'' and ''Viper'' to remain permanently in Bermuda.Armament
''Viper'' was armed with two 7-inch (6½-ton) muzzle-loading rifled guns and two 20-pounder Breech-loading weapon, breech-loading rifled guns. One of ''Vixen'' or ''Viper's'' 7-inch guns was displayed on the waterfront at St. George's Parish, Bermuda, St Georges as recently as 1991.Construction
''Viper'' was ordered from J & W Dudgeon of Cubitt Town on 22 March 1864 and laid down the same year. She was launched on 21 December 1865 and commissioned in 1867 for comparative trials. Her total cost was £51,127.Career
''Vixen'', ''Viper'' and ''Waterwitch'' conducted comparative trials at Stokes Bay in the Solent during the late 1860s. Although turning ability was impressive, none of the ships attained more than in an era when could achieve . Furthermore, ''Vixen'' was nearly lost in the North Channel (Great Britain and Ireland), Irish Channel during a winter gale in 1876, making them unsuitable for the open sea under steam or sail. ''Vixen'' and ''Viper'' were towed to Bermuda in 1868 where the geography favoured the use of steam-powered rams. In July 1869 both ships were employed to bring the floating dock ''Bermuda'' from The Narrows to the dockyard. 1873 saw the loss of all rigging, masts and upperdeck equipment, and this must have helped her to survive the 1878 hurricane which caused serious damage to the floating dock and other dockyard facilities.Fate
''Viper'' was reduced to harbour service in 1890, was converted to a tank vessel in 1901 and was sold in 1908.Citations
References
* * {{DEFAULTSORT:Viper (1865) Gunboats of the Royal Navy Victorian-era gunboats of the United Kingdom Ships built in Cubitt Town 1865 ships