Hello Regal...

The University of Minnesota has a wind tunnel that is available for rent. I'm sure the cost per day is a lot less than the cost of building one from scratch. Air velocities can be varied from 10 mph to over 80 mph.

Test space is about 6' square.

Les Garber and I used it for our autogyro rotor tests with satisfactory results. During a 10 hour day we managed over 35 separate tests with different rotors, blades, etc. See RCM August 2001 for a summary of our results and some photos of the tunnel itself.

Bill