Spitfire: The History
According to RAE trials 12lbs boost would reduce engine life to 10 hours at 3000rpm ground level.
Following trials of 95 and 100 fuel, the decision to supply 100 Octane fuel was made on 16 March 1939. 16 fighter and 2 bomber squadrons were supplied by September 1939
Merlin II produced 1030hp @ 16250ft (42.6" MP) and 1160hp @9000ft (54.3" MP)
Trying to find some performance figures from the Supermarine trials.
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