Rolls Royce Crecy - The Most Advanced Piston Aero Engine Never Made. - YouTube
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Energies | Free Full-Text | The Silent Path: The Development of the Single Sleeve Valve Two-Stroke Engine over the Last 110 Years
Rolls-Royce Crecy, an alternative to the Griffon which was considered for the Spitfire. It was a Two-Stroke V12 of a similar scale to the Merlin, but could be fitted with an exhaust