('Continental!Its motors and its people', William Wagner, Armed Forces Journal International and Aero Publishers, 1983, )

Potentially the most powerful of all sleeve-valve engines (though it never reached production) was the Rolls-Royce Crecy V-12 (oddly, using a 90-degree V-angle), two-stroke, direct-injected, turbocharged (force-scavenged) aero-engine of 26.1 litres capacity.