George wrote:

So far the way I've seen is to use water-cooling internally which
radiates through air cooled fins, using ram-air from the slipstream to
insure rapid air movement. How well this works, I don't know.

I've seen mention of fuel cooling. Use the fuel tanks as a heat sink, then
burn the heated fuel. There's a slight efficiency loss in the engine, I
think.

--
Tom Schoene Replace "invalid" with "net" to e-mail
"If brave men and women never died, there would be nothing
special about bravery." -- Andy Rooney (attributed)