At high altitudes you can close your cowl flaps a little bit (especially if on moderate power settings), since the outside air is cold enough to provide a more pronounced cooling effect.
Radials are reliable and resistant to combat damage but they do have a high workload. Imagine flying a P-47 with CEM: throttle, semi-automatic mixture, prop pitch, cowl flaps, turbo-supercharger, intercoolers (like carb heat but they can also lower the carb temps instead of just raising them) and oil coolers.
Generally speaking, 220-250 is the highest your cylinder head temp should be allowed to reach. On the other hand, if you want to apply power and its below 200, you would be well advised to apply it gradually so it has a chance to warm up, or momentarily close the cowl flaps a bit and open them again after increasing power.
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05-15-2011, 09:59 PM
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