Re: [Paddlewise] [PaddleWise] 2ndry stability

From: M. Wagenbach <wagen_at_u.washington.edu>
Date: Mon, 20 Nov 2000 00:45:39 -0800 (PST)
Nick wrote:
<I am also seeking a definition that does not depend on the paddler's
skills. With practice, a skilled paddler can keep just about anything
upright. A novice paddler may have trouble keeping a bath tub
upright. Stability curves are determined assuming a rigid hunk of
meat in the cockpit. This has the advantage of being skill
independent, any idiot can by a rigid hunk of meat.>

The problem with this is that no idiot WOULD be a rigid hunk of meat (not
that the rigidity of meat is very high, unless badly overcooked).  Unless
completely oblivious to the angle of heel, the meathead will attempt to do
SOMETHING.  A novice will probably either jerk at the paddle and capsize
or let go of the paddle, wave one or both arms in the air and then capsize
(I've seen the latter repeatedly on the river). Whereas an expert would
glide their paddle along the surface, drop their head toward the water
(long live the neck-breaking thread!), lift their knee against the
carefully fitteded kneebrace and hula their butt back under their
weighty, bony skull, at least in a perfect world.

Real-world behaviour is not all shown on the graphs, and is very
dependent on the paddler's various actions.  Why are you
leaned over in the first place?  As one of many possible examples, let me
indict the seat back.  A high seat back, especially if rather square,
tends to transmit the rolling of the boat to the paddler's upper body,
generating a potentially destabilizing weight shift.  One of the (most
easily correctable) reasons that I don't like the Necky Lookshas I've used
is that they have such a seat.  If you are leaned back against the seat in
rough water, not good.  Of course, a paddler of some skill will tend to
poise their body foreward a bit, as a natural response to engaging their
knees into the deck, and let the boat roll, but this can be
fatiguing.  Better to keep the seat, or preferably backband, down away
from the ribs where it belongs, giving lumbar support.  Factors like this
have a real effect on seaworthiness, but can't be quantified easily with
dead meat tests.  I think most paddlers WOULD rate a Looksha with a low
backband as "more stable" in, say, a reflected-wave zone, even if they
didn't realize that it was because they were better isolated from the
roll.

The best exception to this that I can think of is if you were choosing a
boat for someone handicapped by parapalegia.  If you have to strap someone
into the seat, (I don't know any disabled paddlers, so forgive me if I
screw up the details of working around a specific disabiliy) they may have
more trouble not being dumb ballast, and may live life more graphicly, if
I may pun so horribly.

Mike Wagenbach

I'd rather be shooting shoppers at Nordstrom's.



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Received on Mon Nov 20 2000 - 08:30:26 PST

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