Peter said: <<< I re-read Doug L's seam improvement article just now (http://www.nswseakayaker.asn.au/mag/43/seams.html). Doug mentions "adding an exterior and interior keel of UMHW plastic and ash respectively (bolted through the hull),">>> Peter, that's UHMW. I think there was a typo in the article. My latest keel is a bit thicker and I used a softer material called "Starboard" as the UHMW gets brittle with age and UV damage. The NSW article wasn't specifically about "abrasion ablation" (as Dave Kruger calls anything sacrificial like gel-coat, etc), but rather about kayak stiffness. I mentioned the modification, because I wanted a bomb-proof hull with no hint of oil-canning and complete longitudinal stiffness. The modification also provided the sacrificial aspect, too -- of course. I'm certainly not promoting the modification, just explaining my way of doing things as part of an overall scheme to reinforce my kayak for hard-core use. . <<<I am interested in methods of preventing abrasion of the boat keel, and wonder:>>> <snip> The "normal" way is to add layer(s) of epoxy and additives, either aluminum, teflon, etc; or you can add strips of cloth tape, etc, impregnated with epoxy or other mixtures. In my lectures and demonstrations on this subject, I often promote Marinetex (tm) as it is easy to use and wears very well. It is expensive, but the consistency of the mixture is difficult to duplicate with home-mixing of the necessary ingredients - IMHO. For the wooden boat builder, they are already up on the whole epoxy system and the advertised proprietary additives for keelson wear (the products are actually generic, and can be cross-used with various epoxy systems and even polyester resins. The only reason I went to a tougher solution (my plastic/brass keel strip) is that the other methods did not last. YES, I prepped properly, did all the right things with the epoxy methods, but stuff just doesn't stand up to my brand of punishment and BC's brand of barnacles. And if I do ever head down to Australia's big, bad surf with my Nordkapp, and break the kayak in half, the keel will hold the boat together :-) Doug Lloyd (who hopes he isn't wearing too thin on this list) *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
Alex and Doug: Thanks for the helpful info. "And if I do ever head down to Australia's big, bad surf with my Nordkapp, and break the kayak in half, the keel will hold the boat together :-)" Come on down, whoops, up. We'll get a team together to help you lift your boat... Regards, Peter Treby 37°42'S 145°08'E *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
major snips Doug Wrote; > I mentioned the modification, because I wanted a bomb-proof hull with no > hint of oil-canning and complete longitudinal stiffness. > > What's "oil-canning"? Rick (....Virginia) *************************************************************************** PaddleWise Paddling Mailing List - All postings copyright the author and not to be reproduced/forwarded outside PaddleWise without author's permission Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
In a message dated 11/8/00 4:38:31 PM !!!First Boot!!!, Rick.Sylvia_at_ferginc.com writes: << What's "oil-canning"? >> Rick, I felt bad that no one responded to your query. Terminology raises many questions from newer paddlers. I do not believe that P'wise has an official glossary of terms (hint, hint) but it might prove useful. J. Winters has several pages on his website entitled "Good Boatspeak" (I think). I do not believe that "oil-canning" is covered, so, here is my version of "oil-canning." Oil-canning is a term used to describe the flexing action in a boat, noticeable in flat areas. Term probably originated from the action required to pump oil from an "old time oiling can." You know, the type Grandpa used to oil your bicycle chain. Many definitions that I have seen for "oil-canning" describe what is in actuality a dent or "whoop" in a plastic boat. I do not believe that to be a fair definition as it does not transfer to composite boats. Physical evidence of "oil-canning" in composite boats may include semicircular cracks in gelcoat. For those of you in the physical mode; Fill a gallon milk jug with water. Invert the jug completely, holding the jug by the handle. Place very light pressure on the side of the jug with one or two fingers. You should be able to see, hear and feel the pucker and release as the jug empties. "Oil-canning"? Bruce McC WEO *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************
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