I agree, it depends on what you fly. I fly my Super Star Trainer and Four Star 60 up to 10-12 MPH, I fly my Funtana S 90 and Stick up to 20 MPH. My Fat Free Taco has even been flown up to 30-35 MPH. That is about the limit that I fly in. After 35 MPH, the wind just becomes to violent for any aircraft. I'm sure I could possibly go higher, but my comfort level goes down after that speed. Usually, it is already gusting badly when it gets to 25 MPH. At my field (which is on top of a hill by the way), If you can't fly in wind, then you don't get to fly here also. I'm in Jackson, Mississippi. Most calm days at the field have a slight breeze, so if we get a completely calm day. You better utilize that day to the fullest.