We must not forgot another things as well. The way a hull rides the waves and chop. Typically wind powered craft need alot of wind to propel them to high speeds and such conditions have a very strong correlation to a pretty uneven watersurface.

It would not be the first time that a sailing catamaran outpaces a powerboat in a blow because planing in such conditions is very violant. This also leads to the question of how the rig will behaved when it is shaken about very violantly because of the planing surfaces trying to follow confused seas.

Actually I have this experience with landyachts. Sometimes the beach is not flat but has small wave sand structure. It is very hard to keep the sail drawing in such conditions. Even so much that it pays alot to just take a much longer route around such an area, simply because of the ability to reach much higher speeds when the craft and rig operating in a smooth manner due to traveling on a smooth surface.

Of course waterskiing stops with even a very little wave like disturbance of the water surface.

Wouter