Quote:
Originally Posted by Kurfürst
Its a tad bite more than that. The BoB era Spitfire II manual clearly states that the maximum boost allowed in flight is +9 lbs.
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Just like the Spitfire I manual states +6.25 as normal maximum boost (better known as "All out" boost by RAF terminology).
The "cut-out control ... allows the normal maximum boost to be exeeded for special purposes ("emergencies")."
Pilot's Notes General, 1st Edition June 1941.