Subject: Re: [baidarka] building a baidarka
From: JNOTSEWC (J.NOTSEWC@VERIZON.NET)
Date: Tue Nov 06 2001 - 18:36:11 EST
Thank you for responding, when I get the book and read thru it alot of ?'s
will probably be answered. My double has straight gunwales and I did put
some rocker in the one piece keel so hopefully when I skin it, it will put
some rocker in the gunwales. Thanks, John
----- Original Message -----
From: "wolfgang brinck" <nativewater@yahoo.com>
To: <baidarka@paddlewise.net>
Sent: Tuesday, November 06, 2001 11:17 AM
Subject: Re: [baidarka] building a baidarka
> --- JNOTSEWC <J.NOTSEWC@VERIZON.NET> wrote:
> > why does the gunwales need to have 4c about 1 1/2"
> > of a bow in the middle, why
> > not just straight, and how do you keep this bow?
> > also how do you get this bow
> > in the gunwales and in the keel if they are higher
> > then the width? i can
> > understand how to get the bow if the board is flat
> > as it will naturally flex
> > this way?
>
> The wood will flex this much if you place the
> sawhorses appropriately.
>
> Q: Why 1-1/2 inches?
> A: That's how the original was drawn up. A baidarka
> frame without a skin on it is fairly flexible, so the
> amount of bend in the gunwales will depend on how the
> boat was supported when the lines were taken off it.
>
> you certainly don't want any more curvature. If the
> ends of the boat come up too high, you get
> susceptibility to the wind. I've found that a canvas
> skin which still goes on shrinking after several
> wettings will put some extra curvature in the boat. So
> for canvas skin, I would probable start out with flat
> gunwales. With synthetics, this probably isn't an
> issue.
>
> if you do a three piece keel is there a
> > certain way to cut this then
> > wrap it back up so it will flex? how much will it
> > flex when the skin is on?
>
> not sure exactly what the question is. But the longer
> the piece of wood, the greater the flex. The way the
> keelson is lashed, it acts pretty much like one piece
> of wood. The reason for three parts may simply have
> been a way to minimize on the use of wood. You need a
> wider plank to make a bow end of the keelson but you
> can use narrow stuff for the middle and the tail. I
> suspect they may have lashed the bow and the tail
> pieces to the ribs first and then sized the middle
> piece to give the gunwales the right amount of
> curvature.
>
> On one of my boats, I shortened up the middle section
> of the keelson when I was re-skinning the boat because
> it had gotten a little too much sheer ( curvature in
> the gunwales ).
>
> Also, I have used straight wood for the central
> section of keelson, although if you were using
> particularly stiff wood, you could pre-shape it.
>
> The lashings of the deck stringer at the bow can also
> be adjusted to adjust curvature of the boat.
>
> Wolfgang
>
>
> Find a job, post your resume.
> http://careers.yahoo.com
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