John I. Thornycroft & Company Limited, usually known simply as Thornycroft, was a British shipbuilding firm founded by John Isaac Thornycroft in Chiswick in 1866. It moved to Woolston, Southampton, in
Thornycroft with his first boat, Nautilus
Rap of 1873 marked the start of Thornycroft's torpedo boat business
Advertisement for J.I. Thornycroft & Co. in Brassey's Naval Annual 1915
Vosper Thornycroft shipyard at Woolston
Coastal motor boat
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Coastal Motor Boat was a small high-speed British motor torpedo boat used by the Royal Navy in the First World War and up to end of the Second World War.
John I. Thornycroft & Company
…the war, the yard made 26 destroyers, 3 submarines and a large number of smaller craft for the Royal Navy. Notable among the smaller craft were the Coastal Motor Boats (built at Hampton – see below), based on a design by John Thornycroft (the elder) who continued working with hull designs at his home on the Isle of…
40-foot HM Coastal Motor Boat 4 (1916) on display at the Imperial War Museum Duxford, 2017; view from the stern showing the torpedo launching ramp
CMB 103 at Chatham, 2012
Coastal Motor Boat CMB 4R
CMB 4R in Boathouse 4