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Originally Posted by Sutts
I agree that the operational limits are unclear - I have 2 copies of the Mk11a / Mk11b notes - one allows 12 Lb boost in combat, the other restricts it to 9 Lb as Kurfurst points out, except for take off. Strangely they both have July 1940 dates but who knows what could have happened when they were converted to PDF.
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R.M.3.S. is stating +12lbs. as Combat Power Rating for the Merlin XII - 1280hp/3000rpm/10500ft/+12 lbs.
+12.lbs was only possible with BCC-O engaged anyway as far I know.
Take-off power was stated as 1175hp/3000rpm/+12.5 lbs
Perhaps they considered the BCC-O as maximum power hence CPR in the manual. I am sure the manual deals with the limits of the usage and reporting / justifying it's use in combat. +12lbs @ 3000rpm was maximum strain you could ever put onto that engine. There are anecdotal stories about Spitfires (I don't know if they were Merlin XIIs or IIIs tbh) scrambling to intercept a raid at some important target in Lodnon. 6 took-off, BCC-O used straight away to climb asap. The result was that some had to turn back with failures and all of them needed overhaul I suppose. I'll try to dig that story as I might be wrong with details.
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Originally Posted by Sutts
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Agreed completely, that would be great!