It’s hard to tell since the image is not very clear, but it seems you are using a face which is defined by 6 control points. Usually this introduces a lot of twist in the surface. Try to use only faces of 4 points, or 3 if you don’t have an alternative.
Thank you Marven I got It !
Now I’m better, I can’t close de deck properly. I know you have an excellent tutorial about leak points but I don’t understand. It should be really simple…
Thank you again [file name=dlft2.jpg size=72347]http://www.delftship.net/delftship/media/kunena/attachments/legacy/files/dlft2.jpg[/file]