RE: [Paddlewise] A Can of Worms: why tippy -> seaworthy.

From: Nick Schade <schade_at_guillemot-kayaks.com>
Date: Mon, 15 May 2000 09:19:05 -0400
At 8:44 AM -0700 5/14/00, Rob Cookson wrote:
>Could someone please explain to me why tippy boats are more seaworthy.  I
>hear this a lot.  Thanks.

The obvious answer you will hear is that a stable boat will lean to match
the angle of the wave face. However, this is not a complete answer. It is
strange but true that on the angled face of the wave "down" feels like it
is perpendicular to the wave face (apparent gravity is always perpendicular
to the wave face). In other words if you held a plumb bob out in front of
you above the centerline of the boat, when a wave comes by, it would
continue to point at the centerline even when the boat is tipped at an
angle. Strange but true.

This being the case, "normal" waves don't do much to tip you regardless of
the width of the boat. What generally tips people over in normal waves is
their reaction to them, not the boat's.

When the stability starts to make a difference is when the waves are
breaking. In this case the top of the wave breaks free and slides down the
face. If the kayak also breaks free and slides down the face, trouble can
start. The force of the water moving sideways past the bottom of the boat
adds rotational forces to the mix. These rotational are best overcome by
leaning the boat towards the on coming waves. This is easier to do with a
less stable boat. Being able to lean the boat aggressively also lets the
paddler place a brace into the more solid water above/beyond the break.

I suspect it is the greater ease of the paddler to perform an aggressive
brace that improves the appearant seaworthiness of the less stable boat.
With an unskilled paddler, the more stable boat is probably more seaworthy.
So I think it is not the tippy boat that is more seaworthy, but the tippy
boat with a skilled paddler.

Nick




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 Mon May 15 2000 - 06:22:29 PDT

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