The S.6B's Rolls-Royce racing engine produced about 2,350 horsepower and drove the aircraft to 407.5 mph in 1931. That output is compared with a mid-war Griffon, placing the experimental racer at a later wartime power benchmark years earlier. Britain's early mass-production Merlin in 1939 produced roughly 1,000 horsepower, less than half as much. The contrast shows how far elite racing machinery could run ahead of frontline aero engines.
Chapter · 26:08-27:30
S.6B racing power already matched a mid-war Griffon
Compare the S.6B's 2,350 hp and 407.5 mph performance with the early Merlin and the output of a mid-war Griffon.