Georgs ask which factors I thought were the most critical. On Wild Wind IV I have not noticed much slamming in the forward part of the bridge deck, other than in a short sea where the boat hobby horses. This happens when running slowly dead into a short big sea. There is no rocker between the bow and where the slope meets the straight section under the bridge deck. Malcolm wanted a rocker there but I wanted it straight. The straight section works better at high cruising speed. If I were to do it again I may put a slight curve in the section on each side of the nacelle. I am speaking fore and aft. I do get a thud occasionally near the rear of the bridge deck. The shorter the bridge deck the better. I don't think it is worth destroying a good design by shortening the bridge deck. Raising the entire aft section of the bridge deck ends up making a very high back deck. This is not to my liking. I think it is very important to have an easy access from the aft deck to the water. For docking, fishing and getting into the dinghy. I am very happy with the Nacelle. I question if high wing deck clearance is all it is creaked up to be, unless you go really high and this may not be possible in anything but the biggest boats. Shape and strength may be more important. Everything is a compromise, so pick your poison. Dennis Raedeke Wild Wind IV Pachoud 60