Forgot to add one other item to the CS hull form adapted to motorsailer discussion. It doesn't hurt to have a definitive 'pivot point' about which to turn. Even though we're not asking the CS hull form to 'pivot about this point, the rudder forces can act about this point to affect the turn. That is one reason I suggest a CENTRALLY located, pivot-down 'centerboard' in my latest DynaRig-ed (Maltese Falcon) catamaran motorsailer. It provides a pivot point for turning the vessel, as well as reduction in leeway. And there are no hull penetrations. And it is all serviceable while in the water, or in remote locations. Drawing <http://tinyurl.com/2w8eod> <http://www.boatdesign.net/forums/showpost.php?p=167808&postcount=18> <http://www.boatdesign.net/forums/showpost.php?p=167805&postcount=10> <http://www.boatdesign.net/forums/showthread.php?t=2225>