Quote:
Originally Posted by Mustang
But with the injection of wather methanol (MW50) , the overheat takes longer time, you can run saflely 10 minutes, in any condition, that's what says the Luftwaffe.
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No way. Even if MW50 is authorized for a 10 minutes duration the maximum allowed oil and coolant temperatures still apply.
For example Merlin emergency power was authorized for 5 minutes, but the oil and coolant temperature must remain in the specified limits, see:
http://www.spitfireperformance.com/dowding.pdf
The time limit means that the stress on the engine is that high that it will take considerable damage even without overheat after that time.