Quote:
Originally Posted by TomcatViP
2. we hve started from a 6.5lb with an emergency boost of 12lb on a 87 oct and we were discussing abt a 100oct at 12lb vs what I think is a Merlin 100oct topped a 9 (my Merlin argumentation based on the RR sources you know pretty well and based on Qualorific assumption (the amount of heat generated).
Now if I read you well we shld hve a 17lb 100oct ? Humm will I hev to fear reading in the upcoming weeks about the Jet eng being available during BoB (see spitperf.com and blablabla) ? 
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The Merlin XX was given official approval to use 12lb boost for combat in MS gear in Nov 1940, but the engine was cleared for 12lb boost/3000rpm for TO right from the beginning, and so was available to any pilot who cared to use it during combat.
http://www.wwiiaircraftperformance.o...s-10june40.jpg
http://www.wwiiaircraftperformance.o...xx-15nov40.jpg
Approval for 14 and then 16lb boost was added later, along with the appropriate boost override modifications.