Hi all, as a school project we are trying to build a small scale windtunnel. I've been doing a lot of reading, the design of the tunnel is basicly done now. But now comes the real math's. So I got a few questions wich i hope that can be answered by one of you guys. To deside the scale of the tunnel i need to know what the proportion is between the scale of the model and the windspeed. I've read several things and really can't figure out what formula to use. Aka: If scale 1:24 windspeed 1:? What is the best method to cancel most of the wind turbulence, I've seen some construtions that make a grid before the fan. Many thanks in advance from this confused physics student from Holland (Havo5).