Hi All, I am also thinking of pulling the met ash dropping the keel to stop some ingress of water into the bilge. I am thinking of first re-torquing the keel bolts first before pulling everything out. What marina/yard in Sidney are you using for this? Cheers, Bill
Bill Hoyne Mithrandir ’74 C&C35 MkII in Victoria,BC On Oct 3, 2014, at 9:11 PM, Russ & Melody via CnC-List <cnc-list@cnc-list.com> wrote: > Hi David, > > My quip was not quick enough to get in before your clarification and at the > same time, too quick. This subject is not too deep for me after all. > > Re: > 1) - so, you were motoring or sailing downwind through at an extremely low > tide? > > 2) - I would chase each of the cracks with a burr, not a disk grinder. A disk > grinder will not reveal the crack in the same manner as a burr since it can > fold over clean material and you think it doesn't go any further. > My favourite burr looks like the "pointed tree" SG, on this page: > http://www.boggstool.com/page2.html > - when the cracks have been hogged out to bright metal (you cannot see the > crack anymore), you can fill & fair with epoxy filler and tape as per > recommendations. Remember to apply epoxy to lead on a freshly exposed surface > only, as it starts to oxidize right away. A quick run over everything with a > wire brush should do the trick. > - if you excavate down to the keel bolt, don't panic! clean way some more and > pre-treat with phosphoric acid (and wait 24 hours) to "kill the rust" around > your S/S keelbolt before proceeding with above. > > - this repair assumes the keel-hull joint is tight, otherwise crevice > corrosion can still occur since source is a different path. > > - I am skeptical that these cracks are due to haulout on a railway. Lead is > such a ductile material that a point load stress at the bottom is not > resolved as a stress crack at a location that has a much greater area of > support. I believe the indications should be near the bottom of the keel if > this case. > > Cheers, Russ > Sweet 35 mk-1 > PSW, east Vancouver island > > At 07:26 PM 03/10/2014, you wrote: > >> Two related issues: >> >> 1) I found an uncharted rock at low tide this summer so am now having a >> mast out/keel off repair by a reputable yard near Sidney, BC. Since my draft >> is slightly more than the 2 meters Canadian Hydrographic set as their >> minimum for charting obstructions I guess they are off the hook. >> 2) However – the keel has shown minor weeping from a spot on the port >> side corresponding to about the lower end of a keel bolt - seen at haul outs >> since purchase about 6 years ago. At least two surveyors have seen it and >> ignored it. Usually there is a teaspoon or two of water and a bit of rust >> seeps out over 24 hours or so. This time there are two spots. While >> removing the keel (as per #1 above) light grinding over the area shows a >> fine vertical crack a couple of inches long and a couple more smaller cracks >> on other spots further back in line with bolts. On this thin keel the aft >> bolt is only about ½” diameter. I had been told earlier at a Rendevous that >> the trickle, etc could be caused by impurities in the scrap lead used by >> Mars originally. At purchase and since then there has been noted a very >> slight cant to starboard over the whole keel (maybe ¾” at most) again noted >> but ignored at surveys. >> The yard is telling me several things and I am interested to know if anyone >> else with this keel has seen similar issues. Among the suggestions I have >> heard by the yard so far: do light grinding of the area then prep and patch >> with mat/epoxy to seal; or do the patch and also an overlay of fibreglass to >> give more strength (neither of which would be guaranteed); or consider a new >> keel(!). They seem certain the cracking is stress on the keel compounded by >> annual hauling at our Club marine railway for yearly bottom prep, etc; >> they’ve also indicated they would contact Mars for advice. My concern is >> that none of the suggestions sound like a final solution if they are correct >> in the analysis and reasoning. There are also concerns re crevice corrosion >> in the long term in any event. >> >> So: If anyone has heard of and or dealt similar issues I’d appreciate >> feedback. I hope to contact Rob at Southshore as he had the original >> information that scrap lead used in that era was the culprit and essentially >> a cosmetic issue. >> >> Thanks folks. List advice is a great asset. >> _______________________________________________ >> This List is provided by the C&C Photo Album >> >> Email address: >> CnC-List@cnc-list.com >> To change your list preferences, including unsubscribing -- go bottom of >> page at: >> http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > _______________________________________________ > This List is provided by the C&C Photo Album > > Email address: > CnC-List@cnc-list.com > To change your list preferences, including unsubscribing -- go bottom of page > at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com >
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