Burt, Your boat is listed as being built in 1974. Calypso is a 1970 build at Bruckmann's custom yard so maybe a similar keel attachment philosophy.
Calypso has many very large keel bolt/nut combos. And several smaller (shaft and nut) keel bolt combos. It also has a grounding/bonding bolt for a large AWG wire between the mast and the mast step which is also connected to the keel. The smaller keel bolts are often to either side of a larger keel bolt. Calypso's keel is made up of an iron keel with a lead "shoe" that makes up more than ½ of the underwater area. Combined keel weight is over 9,000lbs. Back in 1999 we cut out the lead/fairing material covering most of the large keel bolt lower ends to inspect them for corrosion. The keel bolt ends were L or J shaped and in very good condition. Some of the smaller bolts had the look of being added after sailing trials to "tighten" up the connection of keel and hull. Calypso is hull #1 of the 43 series and was rumored to be built in a bit of a hurry to make the 1971 SORC in which it won its class. After the 71' SORC the boat has been raced/sailed hard every year on the east coast, great lakes, and now in the PNW with no significant keel issues. Hopefully another cnc-lister has a hull similar to yours and is able to give more definitive information. Martin Calypso 1971 C&C 43 Seattle [Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Burt Stratton via CnC-List Sent: Monday, January 19, 2015 11:10 AM To: cnc-list@cnc-list.com Subject: Stus-List Torqing keel bolts I know this subject has been discussed in great detail. Sorry for any duplication. I am in the process of procuring a three quarter drive torque wrench and sockets big enough to re-torque my keel bolts. Before I do this I just want to be sure that 350 foot-pounds is the correct adjustment. Also, all my keel bolts appear to be the same approximate size - very large. The nuts look like one and three quarter inch or larger. There is one, however forward of the mast step that is way smaller. Maybe three quarter inch. Not sure if that is a keel bolt. It doesn't look like one. It almost looks like it could be a ground point but there are no bonding connections to it. It lines up over the forward most part of the keel right in the center of the bottom of the hull.
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