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Just a quick question/note. I've owned, and strictly cruised, my Mk3 for two months now, and just sailed my first two races today. Besides the halyard issues, the engine not starting at the mooring (A4 points probably), and running aground (don't ask), it was a fun day. At least I did not lose a crew member over board, although I was ready to jump ship. <img src="emoticons/icon_smile.gif">
Before the first race, I adjusted the rig tensions. I set them about 900# on the uppers, just under 600# on the rear lowers, and just over 600# on the front lowers. Between races I noticed I could no longer close the door to the head. Has anyone come across this problem before? I assume I have a support problem at the base of the support that runs through the cabin down to the keel. At the end of the second race, I relieved the tension on the rig (the door now opens and closes) and will try a lower setting for tomorrows races. Also If you have another opinion on setting the rig tension it would be greatly appreciated.
Adam
S/V Fever 64077
1979 Mk3
Ha! I am half-way through tackling this one. On my 1980 Mk III, someone had previously done a botched deck repair on the cabin-top, dropping in a solid fiberglass chunk to replace some rotted plywood core. However, this chunk was not properly tied in to the rest of the cabin top with roving, just dropped in and then bedded with epoxy. As a result, when the mast worked under load the fiberglass chunk would shift, breaking the epoxy seal with the rest of the deck. As a result, water would leak in, further rotting the core and dripping down to the cabin sole.
After enough time had passed, the wood compression post which runs from the deckhead under the tabernacle to the cabin sole started to rot from the moisture, allowing the tabernacle area to sink down into the cabin-top. The load of the mast and the stays had to be taken up by the main transverse beam which runs across the top of the main bulkhead. This beam started to develop a distinct dihedral, sagging in the middle right under the mast. If it had gone much farther, the head door would have started refusing to shut. If your head door is already refusing to close, then you really need to investigate further. Peel back some of the vinyl cover at the bottom of the compression post and test for rot by trying to stick a knife into it. On my post, the rot was so advanced that the knife blade went in with almost no resistance. Also, is your cabin-top showing any signs of developing a concavity around the tabernacle? Your rigging tension does not sound excessive to me, I run similar loads on my Mk III and used to use just slightly lighter loads on my C&C 25.
I had the cabin-top professionally rebuilt, at considerable expense. Over the winter, I will be replacing the compression post, possibly with a stainless steel one which will be immune to rot.
I would be very interested to hear from any other owners who are experiencing similar problems. Perhaps we can develop some standard measurements for replacement compression posts.
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