Interesting indeed - especially the part about freeze/thaw keel casting failures. he attributes these to bolt deterioration, but I expect that leaking bedding, imperfect casting, or lose bolts may also contribute.
Here’s what casting failure looks like: https://cncwindstar.blogspot.com/2016/09/mid-1980s-c-keel-issues.html?m=1 Dave Syer 33-2 Sent from my iPhone > On Sep 27, 2022, at 7:17 AM, Ken Heaton <kenhea...@gmail.com> wrote: > > > An interesting read from MarsKeel Technology, Keel Maintenance By: William > Souter > > https://46in1h3fzpsy3uz5el3ytm6p-wpengine.netdna-ssl.com/wp-content/uploads/2019/12/Keel_Repair_White_Paper.pdf > > Ken H. > >> On Mon, 26 Sept 2022 at 16:29, Dave S via CnC-List <cnc-list@cnc-list.com> >> wrote: >> I’ve been following this thread a little bit, And I can’t help but wonder if >> the lead doesn’t creep a tiny bit over time. There’s a lot of compression >> involved. It wouldn’t take much to see a reduction in bolt torque. >> >> Dave 33-2 >> >> Sent from my iPhone >> >>>> On Sep 26, 2022, at 2:27 PM, John Irvin via CnC-List >>>> <cnc-list@cnc-list.com> wrote: >>>> >>> >>> What do Mars Keels have to say? >>> >>> >>> >>> Sent from Mail for Windows >>> >>> >>> >>> From: G Donald Wagner via CnC-List >>> Sent: September 25, 2022 7:30 PM >>> To: cnc-list@cnc-list.com >>> Cc: j...@dellabarba.com; G Donald Wagner >>> Subject: Stus-List Re: C&C 35 MK I Keel Bolts >>> >>> >>> >>> I believe our C&C yachts use lead doped with a percent of Antimony. The >>> Antimony adds strength, hardness, oxidation resistance, and aids in the >>> flow for the casting process. >>> >>> It not like pure lead, and the properties are not the same. maybe we have >>> some metallurgists in the group, and they can comment ? >>> >>> Don Wagner >>> >>> C&C 41 CB >>> >>> "Der Baron" >>> >>> -----Original Message----- >>> From: Joe Della Barba via CnC-List <cnc-list@cnc-list.com> >>> To: 'Stus-List' <cnc-list@cnc-list.com> >>> Cc: j...@dellabarba.com >>> Sent: Sun, Sep 25, 2022 2:32 pm >>> Subject: Stus-List Re: C&C 35 MK I Keel Bolts >>> >>> I hadn’t thought of that! The keel is slowly getting shorter. If I keep the >>> boat another 50 years I won’t be aground at extra-low tide! >>> >>> >>> >>> >>> >>> Joe Della Barba >>> >>> Coquina C&C 35 MK I >>> >>> Kent Island MD USA >>> >>> >>> >>> >>> >>> >>> >>> From: Leeward Rail via CnC-List <cnc-list@cnc-list.com> >>> Sent: Sunday, September 25, 2022 1:24 PM >>> To: cnc-list@cnc-list.com >>> Cc: Leeward Rail <leeward_r...@hotmail.com> >>> Subject: Stus-List Re: C&C 35 MK I Keel Bolts >>> >>> >>> >>> The keel bolts are in lead. Lead is soft and eventually they would pull >>> upwards slightly. I would assume that is why. I have been planning to >>> contact MARSKEEL and get some pro info. >>> >>>
