Editing Henry Royce (section)

==World War I==
Following the start of World War I Royce began designing Rolls-Royce's first aircraft engine, the [[Rolls-Royce Eagle]], which was introduced in 1915.<ref>{{cite book |last= Neal |first= Robert J. |year=2009 |title= Liberty Engine: A Technical & Operational History |url= https://books.google.com/books?id=9y8cBQAAQBAJ&pg=PA12 |page= 12}}</ref> This was a major commitment for both Royce given his health and he signalled his seriousness by reducing his salary as his contribution to the war effort. 
Rolls-Royce had a Daimler-Mercedes DF80 7½-litre water-cooled engine in their procession at Derby and for the first time since 1911 Royce travelled to Derby on 9 August 1914 to inspect it as he considered how to proceed with the design of the Eagle. He was allowed only an hour with the engine, which he somehow managed to extend by another hour before Nurse Audin insisted he stop.  
The Eagle proved to be one of only two aero engines made by [[Allies of World War I| the Allies]] that was neither a production nor a technical failure.<ref>Jeremy, D.  (2017, September 01). Royce, Sir (Frederick) Henry, baronet (1863–1933), engineer and motor car designer. ''Oxford Dictionary of National Biography''. Retrieved 4 August 2019</ref>
Using the experience gained with the Eagle Royce oversaw the development of three further engines. The Falcon (which was designed by Robert Harvey-Bailey), the Hawk and the Condor.

As Royce felt he needed a more economical car for his personal use during the war and admired the designs of [[Ettore Bugatti]], Royce had Arthur Elliot, who was a member of his design team go to London and purchase on his behalf a small second-hand [[Bugatti]].<ref name=Reese_Pg141-144>Reese, pp. 141, 143, 144</ref> It ran badly and caught fire on the trip while departing the city. Despite this it was bought back to St Margaret’s Bay, where Royce tuned it to his satisfaction and used it for the rest of the war.