Quote:
Originally Posted by *Buzzsaw*
Taking all aircraft but the Spit IIA over 98 degrees is a mistake, the Merlin III might not break immediately, but there will be consequences.
The Spit IIA Merlin XII can run at temps below 105 degrees below 5000 ft, but as you get higher, the temperature limitation threshold drops. Over 10,000 ft, not a good idea to go over 95 degrees.
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The idea in CLOD was to recognise the differences between the Merlin II & III, which were cooled by 100% glycol, and the Merlin XII which was cooled by a 70-30% water-glycol mix. As a rule the earlier Merlins ran at higher temperatures and were more likely to have oil seals fail - unfortunately the CLOD engines are still too sensitive and too prone to failure but, as JTD said, there will be no more development so that's the best that we can expect