Comment by Arno de Jager on September 16, 2011 at 5:40am

I've build one once. First thing you should test, is whether the turbulence (created by the fan) is filtered properly. I ended up having to use straws to linearize the airflow.

JDrones Comment by Jani Hirvinen on September 16, 2011 at 7:15am

Also square tube is not the best one for wind tunnel. It should be roundish. When you run tests on square tube, results are not equal as corners will have different air pressure than middle areas.

 

Try to make it as a tube and you will have a lot better test results.

Comment by john bero on September 17, 2011 at 7:00am

Straws work great,  I helped develop a small wind tunnel for middle school tech labs back in the early nineties.  We used the straws with good effect.  Our biggest problem was the development of a smoke generator and wand.  We settled  on a low speed fan so that the smoke system could keep up.  It worked very well. 

Comment by Richard Unwin on September 18, 2011 at 10:52pm

the tunnel was square for testing HVAC lourves , maybe the next one will be round and be given a dual use of testing an airframe, at the moment however all my testing is done in the air. and sometimes the ground.

 

richie

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