If the board is not faired (flat plate) and you have an AutoCAD dwg of it (aclt works) you can find the cg easily by making a region of the outline and then check the region/mass properties. If you have a paper dwg of it you can cut out the shape and hang it from a stick pin in two places (one at a time) and the intersection of vertical lines drawn from each pin will be at the cg. If it has been faired or you don't have either of the above, you can balance it on a straight edge two times and where the balancing lines cross is the cg.... Tod -----Original Message----- From: montgomery_boats-bounces@mailman.xmission.com [mailto:montgomery_boats-bounces@mailman.xmission.com] On Behalf Of MC Carpenter Sent: Tuesday, December 02, 2003 8:08 PM To: For and about Montgomery Sailboats; Mark Escovedo Subject: M_Boats: Re: previous board diagram I got the new stainless centerboard today but it is 11 lbs too light. Do you know a way a simple way to find the exact center of weight for easy lifting it in to place and the exact center of effort, I know the center constantly changes while under way but for records I would like to know where it is and how it changes with different sail plans. ( reefing )