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#14
August 8th 07, 07:25 AM
posted to rec.aviation.piloting
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props: tractor v pusher, q tip, ducted?
"Kyle Boatright" wrote Double? Naah. It expands, but doesn't double. Boyle's law (PV=NRT) is based on absolute temperature, which is measured in kelvin. Kelvin is Celsius plus 273 degrees. Guessing now, if the air temp went from 300k to 350k (or about 80F/27C to about 160F/70C) you'd see volume increase by (350/300 -1) = 1/6th = about 17%... OK. I have always heard the approximate rule for good cooling is double the intake size for the exit size. Guess it doesn't transfer to expansion. -- Jim in NC 
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