The Effect of Wind on Aerodynamics

In the wind tunnel, you kind of want to see a range of yaw angles. And so what some people will do is they'll start at minus 20 and then they sweep all the way to like plus 20. But every time you go from zero to 20 on the right or even if you went from zero to20 on the left, the results will always be better than going from starting from a negative 20 and then moving up to zero. The reason for that has to do with the way air flow performs after it has detached from the rim.