Subject: Re: [baidarka] Greenland gunwale angle
From: brian.nystrom@att.net
Date: Wed Oct 17 2001 - 09:27:11 EDT
> Brian wrote about gunwales:
>
>
> >I also can't see the point in using rot-prone natural fibers (jute, etc.) for
> >lashing, when synthetic equivalents that are impervious to water are readily
> >available.
>
> I agree, but book for polyester imitation sinue, the nylon type will loosen
> when wet. Nylon absorbs water and relaxes since it gets longer when wet, and
> it makes the lashings loose. Most marie supply stores sell he polyester type
> for sail repairs, also George Dyson Baidarka and Co. in Bellingham has a good
> price on a huge roll that is enough to make 5 or more kayaks.
I used Gudebrod polyester lacing tape, which has the advantage of being flat, rather than round, so it requires less grooving of the parts being lashed. I used black, which provided a nice contrast to the wood, but it's also available in white and possibly other colors.
> >The 17 degree gunwales are also supposed to result in more of a muliti-chined
> >hull (at least in the center of the boat), which it does. The 28 degree
> >gunwales should produce a classic, four panel, hard-chine hull. It's a matter
> >of personal preference.
> I would suspect that the 28 degree gunwales would have to be larger and
> heavier to provide the same amount of strength as the 17 degree gunwales. the
> more vertical the wide dimension of the gunwale, the more strength you get
> from the same size piece of wood. So it should be possible to make the kayak
> lighter, assuming you are going for the same strength, with smaller gunwales,
> using 17 degree gunwales. Perhaps even lighter if they were only at say 10
> degrees. I would also suspect that you will get all kinds of strange second
> order internal stresses in the 28 degree gunwale when it flexes, causing it to
> buckle sand fail sooner, than with a more vertical one. Also meaning that you
> would need a much heavier gunwale to make similar strength hulls.
Good point.
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