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Old Mar 13, 2012, 05:33 PM
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just Some Useless Geek
Chicagoland
Joined Oct 2008
2,554 Posts
Don't forget that most of the guys building back-yard wind tunnels are using some sort of collimator (dave1993's paper tubes) to get the spiral motion removed from the air and make it move in a linear fashion. The collimator takes up a certain amount of room, so even if the wind tunnel test chamber is a meter long you probby need at least that much length of collimator tubing or grid or whatever to get the air de-turbulated. Smoothed out, whatever.
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