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#11
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On Jun 3, 5:41 pm, wrote:
The prop does not throw air outward. We've been over that one before. The air column actually narrows behind the prop, due to the lowered pressure caused by the air's acceleration. We can see it on cool mornings when the dew point is just below ambient temperature, and the vapor trails off the prop tips outline the periphery of the air column, showing it to be squeezing inward. More on the narrowing of fluid flows behind propellers: Marine propeller: http://www.aip.org/pt/feb00/maris.htm Helicopter rotor: http://www.camrad.com/CAMRADIIresults.html Behind transport props: http://home.att.net/~polar/130contrail.jpg Behind an F4U's prop: http://people.bath.ac.uk/ensmjc/Research/corsair.gif In no case do we see air (or any other fluid) being thrown out centrifugally. Dan |
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