Subject: Re: baidarka Date: Tue, 21 Nov 2000 17:58:26 -0800
From: James Mitchell (mariner@seanet.com)
Date: Wed Dec 06 2000 - 00:46:22 EST
Narrow waterlines with lots of flare have a very interesting effect in
umiaks. Corey uses a continuous rib design in his umiaks, with half-ribs
joined at the keel. The effect is a very steep vee bottom with lots of
flare. Most of the umiak and umiak models I have seen at UBC and Alaska
State Museum use a flat bottom, with the ribs starting at the chine.
Corey's umiaks need about a dozen people in them to pull them down into the
water far enough to make them decently stable. They are great for hauling
literally tons of gear! But they do not inspire a lot of confidence if
lightly loaded. They are seaworthy enough; so far as I know, none have ever
capsized, but they do tend to feel a bit light footed at times. That is
really the same thing I feel when kayaking, but the size and the sail make
this tenderness a more nervous condition in the umiak.
----- Original Message -----
From: "Douglas Ingram" <redcanoe@pangea.ca>
To: <baidarka@lists.intelenet.net>
Sent: Tuesday, December 05, 2000 7:23 AM
Subject: Re: baidarka Date: Tue, 21 Nov 2000 17:58:26 -0800
> Adding beam at the waterline will slow the boat somewhat, but there are
many
> other factors influencing speed, not just width.
>
> Adding flare above the waterline will have no affect on waterline width,
so
> no effect upon speed.
>
> Dories have very narrow bottoms for their overall shape. The center of
> gravity is also usually very high, untill the ballast or cargo is added to
> compensate.
>
> Douglas Ingram
>
>
> > << Knowing only a little about design, I would have thought adding beam
> would initially stabilize (and slow) the boat while widening the gunwales
> would add reserve stability. ... Dories are very tender too until they
> either have ballast in them (originally fish) or they drop onto their
sides.
> ... As I have tried to draw to your plan the largest cross section of a
> kayak, it does get rather "V'ed." I suppose yours is too. Right?
Hmmmmm.
> of course I was drawing mine wider than you (24").
> >
> > Anyway, thanks for the help. You are the only one who has responded.
> >
> > Phil Sharp
> > SeaCaller
> >
> > .. >>
> >
> > Phil, were you aware of (involved in?!?) the recent stability
discussions
> on Paddlewise? Matt Broze (Mariner Kayaks) and John Winters (Redwing
> Designs) weighed in very interestingly, as did a number of others who
> obviously had the knowledge and experience to amke the time they spent on
> the debate very much worth while.
> >
> > Ralph
> > -
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> >
>
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