Acceleration on these things (from close reach to broad reach) is insane...The apparent wind builds up in seconds...They'll probably beat many sportscars from 0 to 50 mph.
When on the beach with landyachters, keep your dog on the leash...I've known a few decapitated... <img src="http://www.catsailor.com/forums/images/graemlins/blush.gif" alt="" />