The water was nearly glassy calm today, but there was a slight ripple near the shore- probably a thermal created by warming air rising over the land and pulling cooler air off the water. I'd guess that it was in the 3-5 knot range. I tried the Mid-Vent with Race Rods on 75' x 80# lines. It took a bit of body motion (a step or 2 backwards) sometimes to keep it going during the lulls, but it did quite well. The Standard sail with Race Rods would've been less work, but I was quite impressed with how low the Mid-Vent flew with the light frame.