I have a 9 oz epp foamie that I keep in the car, I fly it most days... the strongest wind I have flown that plane in was measured at 35MPH... it had just enough power to go forward at about 1mph relative to the ground at full throttle directly into the wind... had to land backwards, about 20MPH is a good wind speed for that plane, you can do slow rolls right in front of yourself without going forward.