Heh, just because the wind is calm at ground level doesn't mean the wind isn't blowing higher up. The neat thing about airplanes is that they really don't know it's windy. As long as your airplane can fly faster than the wind can blow you can fly it...well, technically anyway. The wind is really only problematic if it's fast enough that you can't make much headway against it, or you have to deal with a gust at landing or takeoff. Some of the most fun flights I ever had was with a 1/2A Q-Tee in 15-20 MPH winds.