Subject: Re: [baidarka] 3 questions about ash... well, one about D-fir
From: WeBookPeople@aol.com
Date: Thu Jul 17 2003 - 06:59:29 EDT
Bill, using ash on a keelson with a smaller vertical section , if the
reduction is calculated correctly, would have the same stiffness as the original
sitka spruce keelson from an engineering standpoint. If there is more to it than
the stiffness of that member, I'd sure like to know of it before I cut wood :-)
In a previous post, Brian said: "Remember, reducing the height of the keel
stringer and/or chines will also reduce the clearance between the ribs and the
skin."
Can someone explain the significance of this clearance to me? I learn
something new every day on this list; maybe when my Brinck and Zimmerly books arrive
I'll alleviate some of my ignorance. Is it a matter of having clearance so the
skin doesn't rub the frame when it relaxes in the water? If so, is it a
matter of drag or of wear? Also, soes it apply to skins of nylon/UA as well as
canvas/paint?
TIA/Carron
In a message dated 7/17/03 5:22:41 AM Eastern Daylight Time,
bill@billmercer.com writes:
> Also remember that when you reduce the depth of the keelson you reduce
> its stiffness much more (well, in the vertical plane) than if you make it
> thinner from side to side. (Vertical) stiffness of the keelson goes up by
> the cube (I think) of the depth. So be real careful about reducing that
> dimension unless you want a floppy boat.
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