Cheap(ish) wind tunnel
 

Found this while surfing the 'net , dunno if it's been on here before :

The Henrich Focke Wind Tunnel - yes, the founder of Focke-Wulf and Focke-Achgelis

Henrich Focke's Windkanal

Focke-Windkanal - Technical Data

They charge 950 euro / running day , 475 for set-up days.
Or a bit less for private persons, if the project interest them ;-)

Awesome! Too bad it's such a long drive.

If I was richer and smarter I might try designing portable wind tunnels for bikes in a trailer.