Editing D. Napier & Son (section)

====Motor yachting====
Napier expanded into marine engines and launches. In 1903 a S. F. Edge's Napier launch won the inaugural British International [[Harmsworth Trophy]] for speedboats at [[Cork Harbour]] in Ireland, driven by [[Dorothy Levitt]]. She achieved {{convert|19.3|mi/h|km/h|abbr=on}} in a {{convert|40|ft|m|adj=on}} steel-hulled, speedboat fitted with a 3-blade propeller. As both the owner and entrant of the boat, "S. F. Edge" is engraved on the trophy as the winner. The third crew member, Campbell Muir, may also have taken the controls.

On 8 August 1903 Levitt drove the Napier at [[Cowes]] and won the race. She was then commanded to the [[HMY Britannia (Royal Cutter Yacht)|royal yacht]] by [[King Edward VII]] where he congratulated her on her pluck and skill, and they discussed the performance of the boat and its potential for British government despatch work.<ref name="PIP Nov 1906">"The Sensational Adventures of Miss Dorothy Levitt, – Champion Lady Motorist of the World", ''[[The Penny Illustrated Paper and Illustrated Times]]'' (London, England), Saturday, 17 November 1906; p. 309; Issue 2373.[https://archive.today/20130102010433/http://forums.autosport.com/index.php?showtopic=106579&st=40&start=40 Autosport, The Nostalgia Forum, Historical Research, Dorothy Levitt – early motoring]</ref>

Later in August Levitt won the [[Menier Chocolate|Gaston Menier Cup]] at Trouville, France. This was described as the "five-mile world's championship of the sea" and the prize was $1,750.<ref name="Chatty p8-9">''The Woman and the Car – a Chatty Little Handbook for All Women Who Motor Or Who Want to Motor'' by Dorothy Levitt. pages 8–9.</ref>

In October 1903 Levitt won the Championship of the Seas at Trouville, and the French government bought the boat for £1,000.<ref name="PIP Nov 1906"/><ref name="Chatty p8-9"/>

The 1905 boat ''Napier II'' set the world [[water speed record]] for a mile at almost 30 [[knot (unit)|knot]]s (56&nbsp;km/h).

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