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#1
August 9th 07, 12:08 AM
posted to rec.aviation.piloting
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props: tractor v pusher, q tip, ducted?
"Morgans" wrote in message
... "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. Thanks for the info on the air expanding. Does this translate into more drag if the engine is running? Danny Deger 
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