Re: [Paddlewise] 2ndry stability

From: Nick Schade <schade_at_guillemot-kayaks.com>
Date: Tue, 21 Nov 2000 10:08:42 -0500
As a guy who likes to design kayaks and tends to have an engineering 
bent, I place some value on the stability curve. But I don't feel I 
really know how a kayak handles until I've paddled it for a while. I 
don't think anyone should let a stability curve convince them to buy 
a boat they otherwise don't feel comfortable in or scare them away 
from a boat that they really like. If a lumberjack can stand up and 
run around on a half submerged log, most people should be able learn 
to stay upright in just about any kayak built.

  One value of knowing how to read a stability curve for the layman is 
to protect themselves from salesmen who hide behind simple, logical 
sounding phrases like: "This boat is wider than that one so is more 
stable." or "Because this boat is hard chined it has very good 
secondary stability."

Just knowing that stability is more complicated than width or chine 
shape will go a long way to making a more informed buyer. And maybe 
having the idea in the back of their mind that there may be a point 
in the stability where it changes from getting stiffer to getting 
looser, will make the buyer try to look for that point when they try 
a boat. They may or may not like the feeling, but at least they might 
think to look for it and form an opinion.

This knowledge can also help organize their thoughts about what it is 
they like about the boat. Instead of just "I like this boat and it is 
hard chined, therefore I like hard chined boats." it can be "I like 
the way this boat gets harder to tip before it goes all the way 
over." and look for boats which respond the same instead of just 
looking the same.

This could all be learned without ever looking at a stability curve, 
but learning about the curve can help understanding the factors 
involved.

Nick

At 9:45 PM -0800 11/20/00, Harvey Golden wrote:
>  <snip>
>
>A stability curve does say a lot-- certainly more than the holy but
>insignificant measurement of "beam" does. (I have a 19" wide kayak that's
>tippier than my 15-1/4" wide kayak. [Heresy!])   As Nick said, there is no
>substitution to trying the kayak yourself.  He also says that it takes
>effort and knowledge to use the curves.  I personally think that for the
>average paddler-non-naval-architect, that the kayak could be paddled
>extensively before the curves for the particular design can begin to make
>practical sense.  (Lest we presume to understand the "curve" before we
>really understand the kayak.)
>     Harvey Golden
>             www.pacifier.com/~qayaq
-- 


Nick Schade
Guillemot Kayaks
824 Thompson St, Suite I
Glastonbury, CT 06033
(860) 659-8847

Schade_at_guillemot-kayaks.com
http://www.guillemot-kayaks.com/

>>>>"It's not just Art, It's a Craft!"<<<<

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Received on Tue Nov 21 2000 - 07:30:45 PST

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