Thanks Dave! I'll need to test it on the water, but I think you solved the problem with the diagram- I think I was sailing with the board too low, to the point where very little board remained in the trunk. I had the lowest point of the top of the centerboard between the pin and pendant just flush with the keel, but it sounds like it should be a few inches higher than that. Tyler Davis, CA M15 #157 "Defiant" On Sep 16, 2014, at 11:54 AM, Dave Scobie wrote:
the 'fitting' of the pin is just 'compression type'; meaning the pin is held in place by how tight it fits through the shoal keel. the pin is also, somewhat, held in place with the bedding compound you used to cover the ends of the pin once it was installed. you always want to inspect the pivot pin, to assure it has not 'walked' out of the keel's pivot hole, when you trailer the boat and after removing it from the water.
Jerry's tolerance for the board-to-trunk-wall was small. if your new board is narrow the 'gap' will be larger so more 'room' for clunking.
if a shim makes you 'sleep better at night' go for it ... i'm assuming you know you just want a shim at the 'top' of the board ('top' in this case means the portion of the board that remains in the truck when the board is extended). you don't want shims to mess with the foil shape as this will ruin the boat's windward ability and slow it down on all points of sail.
see picture attached that outlines the portions of the extended centerboard that are 'inside' and 'outside' the trunk.
-- :: Dave Scobie :: former M15 owner - www.freewebs.com/m15-named-scred :: M17 #375 SWEET PEA - www.m17-375.webs.com