Hi here's one for you NAs - I can understand why a hull has a bow-down trim force from a driving sailing rig but what exactly causes the stern to squat under power? If the hull was simply towed from a bow tractor instead of pushed from under the stern by a prop would the same thing happen? Thanks...Bob --------------------------------- Be a better Globetrotter. Get better travel answers from someone who knows. Yahoo! Answers - Check it out.