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HMS Rattler

Vessel
HMS Rattler was a 9-gun steam screw sloop of the Royal Navy, and one of the first British warships to be completed with screw propulsion. She was originally ordered as a paddle wheel 4-gun steam vessel from Sheerness Dockyard on 12 March 1841. Wikipedia
Launched: April 13, 1843
Construction started: April 1842
Propulsion: Maudslay, Sons & Field four-cylinder vertical single-expansion steam engine; Single strap-driven screw
Cost: £9,400 plus £17,413 for fitting
Speed: 10.074 knots (18.657 km/h)