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bahearn · Jul 22nd, 2002, 05:59 PM

Clear as mud. Got a link? How about a particular photo in SCC or Car&Driver? Those are the only two car rags I read.

Here's a free but potent demonstration of a moving liquid (did you know that air is a liquid?) and differential pressure.

Start your kitchen tap flowing, flow rate is unimportant. Suspend a spoon by the end of its handle, concave side toward you, between your finger and thumb. It must be loosely held so that it can swing. Now, gently touch the back (convex) side into the stream of water; it should pull the spoon even farther into the stream of water. Despite the much higher density of liquid water versus air, the moving water exerts lower pressure so that the still air pushes the spoon farther into the moving water. You've demonstrated one aspect of Bernoulli's Principle.

Aerodynamics is really a small part of the broader studies known as hydrodynamics. Air is just a liquid medium with very low density.

Jul 22nd, 2002, 05:59 PM	#12 (permalink)
bahearn bitter old man Join Date: Jul 2002 Location: La Porte, Texas Posts: 1,458	Clear as mud. Got a link? How about a particular photo in SCC or Car&Driver? Those are the only two car rags I read. Here's a free but potent demonstration of a moving liquid (did you know that air is a liquid?) and differential pressure. Start your kitchen tap flowing, flow rate is unimportant. Suspend a spoon by the end of its handle, concave side toward you, between your finger and thumb. It must be loosely held so that it can swing. Now, gently touch the back (convex) side into the stream of water; it should pull the spoon even farther into the stream of water. Despite the much higher density of liquid water versus air, the moving water exerts lower pressure so that the still air pushes the spoon farther into the moving water. You've demonstrated one aspect of Bernoulli's Principle. Aerodynamics is really a small part of the broader studies known as hydrodynamics. Air is just a liquid medium with very low density. __________________ Bruce in Houston '94 Nissan Sentra SE-R w/ $tuff, converting to ITA '98 Suzuki Bandit 1200S w/ $tuff '02 Dodge Dakota SLT 4-dr tow beast, stock!