HMS Viper was an armoured iron gunboat of the breastwork type, constructed primarily of iron with a backing of 10 inches of teak. She was the only vessel of her class and served as an experimental platform for the Royal Navy. Launched on 21 December 1865 after being ordered from J & W Dudgeon of Cubitt Town, she was commissioned in 1867, with her construction costing approximately £51,127. Viper featured a unique design with two vertical trunks at the stern to lift her twin screws clear of the hull, which facilitated better hull-form for wind-driven sailing. She was equipped with two sets of 4-cylinder horizontal single-expansion steam engines, each powering a 9-foot diameter Maudslay & Griffiths screw. These engines produced a total of 696 indicated horsepower, allowing her to reach a top speed of 9.5 knots. Steam was supplied by two Maudslay iron fire-tube boilers with six furnaces. Although she carried a barquentine rig, all masts and rigging were removed in 1873 when she was stationed in Bermuda. Armament consisted of two 7-inch (6½-ton) muzzle-loading rifled guns and two 20-pounder breech-loading rifled guns, reflecting her role as a versatile armoured gunboat. During her service, Viper participated in comparative trials with sister ships Vixen and Waterwitch at Stokes Bay in the late 1860s. Despite impressive turning abilities, her speed did not exceed 9.5 knots, which was significantly slower than the ironclad Warrior’s 14.5 knots, highlighting her limitations in open sea conditions. Viper's operational history included her deployment to Bermuda, where she and Vixen were towed in 1868. She played a role in moving the floating dock within Bermuda’s dockyard and endured significant weather events, including a hurricane in 1878, which damaged dockyard facilities but left her relatively unscathed after rigging removal. She was relegated to harbour service in 1890, converted into a tank vessel in 1901, and ultimately sold in 1908, marking her as a notable experimental vessel within the Royal Navy’s transition era from sail to steam-powered ships.

This description has been generated using GPT-4.1-NANO based on the Vessel's wikidata information and then modified by ShipIndex.org staff.