Date: Mon, 15 Feb 1999 09:59:26 +0100
From: Stefano Moretti <s.moretti@agora.stm.it>
To: baidarka@lists.intelenet.net
Subject: Re: baidarka stability
Ve Smith wrote:
> but I was in a pool last week working with a guy in an anas acuta and
> couldn't help noticing that when he leaned a little, his boat turned
> as if it had seen a snake in the water. I can lean until the gunwale's
>
> under, and not much of anything happens except a display of the boat's
>
> amazing secondary stability.
>
> Looking at the shape of the boat, I can see why this is-it's has just
> about the same underwater shape leaned as it does straight up.
I doubt this is the reason for stability. What you are describing is
actually "neutral form stability" which makes the boat float in any
position with no preferences, which mean tippy (think of a circular
section).
What you have in flared boats is that the section increases when leaning
and the bulk of the volume of displaced water moves more towards the
gunwale increasing the righting moment (at least until a certain degree
of inclination, sometimes approaching 60°).
This feature is very noticeable in greenlanders, but I know nothing
about baidarkas and the actually look more round shaped.
Multiple chine may slow down rolling motion but not increase leaned
stability, as for I know.
Would be curious about knowing more of the underwater performance of
baidarka hulls.
Stefano
> What I
> want to know is, are all baidarkas like this? Did I build a bum boat?
> Is there a way to fix this without giving up the baidarka's other
> sterling characteristics?
>
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