I live on Lake Conroe, TX. Two days ago we had some good wind blowing so I decided to take my GPS out and sail for about an hour and a half. With my 210 lbs plus my 85 lb labrador retriever and stock sail, we hit a top speed of 13.8 mph. Winds were pretty gusty so we would get a wild ride for a way then things would drop off to a milder speed but, we did average almost 7 mph for a 7.5 mile round trip. That's about the best I've done so far not having sailed at all until this March.
Pete