This comes from WWII pilots that when in combat would go full mil power and never have an issue. I have several WWII airplane and engine manuals, and they give lots of warnings, but nothing about running at full mil power. The manual states no more than 5 minutes at WEP or Take off power. Water injection helps cool the engine, if cooling was an issue than the water injection would be started earlier. In addition the higher up you get the colder the air is, it is also thinner however.
The ME262 over heats at 100%, jet engines generally do not get hot (so to speak, at least not to start melting things.) due to there nature.
I will test the cowling effects more.
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