Thanks guys, I will try to tap and sound my way to see how far away from genoa track the rot extends. I have oversized the backing plate back in 2004. I have 2" wide x 3/8" thick aluminum bars as opposed to original which I believe was 1"x1/4". If tapping does not work, I will drill to find where rot ends. I plan to cut over the weekend and based on that i was thinking maybe to get a 50yd roll of 10" or 12" wide 9oz cloth tape. I don't know if you know about this guy but he is very reasonable. I've been getting gelcoat, resin and fiberglass from him for years. I also got interlux perfection and primer for topsides I did few years back.
http://www.mertons.com/Reinforcements/cloth_tape.html thanks again, Petar On Wed, Feb 3, 2016 at 1:53 PM, Martin DeYoung via CnC-List < [email protected]> wrote: > Petar, > > > > Based on repairing significant areas of rotten and wet core on Calypso I > agree with what Mike Hoyt posted. I did most of Calypso’s repairs from the > inside owing to the ease of access and the many contoured areas involved. > With a repair under a genoa track, especially if your access to the > underside is limited working from the top will be far easier. > > > > When I was tracking down the extent of rot and very wet core I used a > ballpeen hammer and tapped all around the suspect deck. Start in a known > dry, well bonded area and calibrate your ear to the sound. Likely well > bonded laminates will sound “sharp” or “bright”. Then move to a known or > suspected failed area. The sound will likely become “dull” or “hollow”. I > also made many test holes as Mike described. > > > > If you are lucky the damaged areas are all concentrated around the > fastener holes and the repair areas will be small. > > > > As to how wet balsa can be without concern, I recommend you visit Baltek’s > web site. Baltek has links to some studies that compare % of moisture to > core strength. Let me know if you cannot find those reports as I likely > still have copies stashed somewhere in my many C&C 43 restoration archives. > > > > Martin DeYoung > > Calypso > > 1971 C&C 43 > > Seattle > > > [image: Description: Description: cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] > > > > *From:* CnC-List [mailto:[email protected]] *On Behalf Of *Petar > Horvatic via CnC-List > *Sent:* Wednesday, February 03, 2016 8:45 AM > *To:* [email protected] > *Cc:* Petar Horvatic > *Subject:* Stus-List repairing large wet deck core areas > > > > Hi all, > > I am getting ready to tackle the wet deck along the port genoa track and > before I start cutting, I have few questions for the group. > > > > Gelcoat cracks and delamination is appearing almost the length of the > track on my 38 Mk2. I realize that not all spider cracks are due to wet > core, but there is some strong indication that at least ¾ section of geona > track area is rotten. Namely, top deck is noticeably indented along the > track from compression of backing plate and track screws. I also remember > that water was coming out of the tracks in areas where track was under > load. Especially area in the aft section. I pulled the track off last > night and there is strong oxidation along the aluminum backing plate where > ss washers and nuts were. > > > > Any idea on how to determine how far athwartship to go when cutting out > the top laminate? I guess tap with a mallet? Do people mostly save the > top laminate or decide to lay new one from scratch? I am also thinking > that it would be better to cut the area so entire genoa track is included > so that I don’t have to deal with potential of uneven surface between > repair area and untouched area where genoa track lies. I can foresee > potential issues with the car not riding smoothly in area of that > transition. > > > > Thanks > > > > Petar Horvatic > > Sundowner > > 76 C&C 38MkII > > On the hard at Stanley’s in Barrington > > > > > > _______________________________________________ > > Email address: > [email protected] > To change your list preferences, including unsubscribing -- go to the > bottom of page at: > http://cnc-list.com/mailman/listinfo/cnc-list_cnc-list.com > > >
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