Displacing 420 tons, Velox measured 210 feet in length with a 21 foot beam and was modestly armed with 1-12pdr., 5-6pdrs. and 2-torpedo tubes. Fitted with quadruple screws, she had two pairs of Parsons' turbines (High and Low Pressure) and a reciprocating cruising engine by Paul of Dumbarton. Her active career was a very limited one due to the furious pace of technical change and, by 1909, she was deemed unfit for further sea service and attached to H.M.S. Vernon for use "as an Instructional Vessel in Torpedo and W/T as such duties would not necessitate going to sea in anything approaching bad weather." When the Great War began in 1914, expediency demanded that this order be rescinded and whilst out on a routine patrol, Velox hit a mine off the Nab Light Vessel and sank on 25th October 1915, apparently without loss of life. Never an operational success due to several fundamental design faults, Velox nevertheless deserves her place in naval history as the boat which proved the case for turbine power and paved the way for the generations of versatile and high-powered destroyers which followed after her.