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Engine Cooling - why not....
wrote in message ... good point, Veeduber. Wonder how much this effect/penalty is. -------------------------------------------------------------------------------------------------------- In quantitative terms, I've no idea. At a guess, it appeared to be about 25%. The main reason for this is that the cooling air expands as it picks up heat. The casting draft takes this into account with the passageways being progressively larger on the 'down-wind' direction. Reverse the direction of the air-flow, you end up trying to force the heated air into a passageway that is steadily decreasing in cross- section. I went through this phase yearz & years ago, was surprised when it didn't work as well up vs down, went back to doing it the other way. Every few years I read about another instant expert who thinks they've discovered the Silver Bullet, citing all sorts of benefits. Best I can say is try it both ways... then think for yourself. -R.S.Hoover Indeed the breakthrough that led to the development of high power air cooled engines for WWII aircraft was advances in cooling fin design. The ability to cast and machine extremely fine fins combined with high octane fuel allowed Allied aircraft to develop far more HP per pound than Axis aircraft engines. Fins aren't trivial. Bill Daniels |
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