Re: [T3] cooling

[JaransonT3@aol.com]

Actually, I think I have it right, although your question caused me to 
rethink it again.  I will need to double check my aero references at work 
tomorrow, but.....  I think I remember correctly that the convention is 
pressure acting normal to the surface is positive upward nad away from the 
surface...thus creating positive lift.

You are correct that the Lift is caused by there being a lower absolute 
pressure on the upper surface of a wing than the lower surface, but when 
plotting the pressure distribution around a body it is positive away from the 
surface.  SO....high pressure (positive numbers) are pulling on the surface 
and low pressure (negative numbers) are pushing on the surface.  It is a 
little confusing.

I will double check tomorrow morning.

Later,
John Jaranson
'71 FI Auto Fasty (Jane)
http;//hometown.aol.com/jaransonT3

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