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details – skegs/fins
These sketches show various attempts at location and construction of skegs.

The plan drawing above shows a whole array of possible fin mounting locations – central rear, central, twin side and sidemount:

The central and central rear skegs will be hard to reach while in the boat or will require internal wires or cables – and the central would require a long slit in the skin. As well as not liking the location for this surf craft, I feel that the complexities of these fins and skegs are not going to be easy to carry out. So I’ll reject them for this little craft . . .

I love the simplicity and directness of the sidemount skeg, but just don’t feel that it will be strong or rigid enough itself and in some situations I could even see it just ripping or tearing the rail apart! And notwithstanding all that, I can only imagine the frustration at continually hooking up my paddle or my thumbs on the assembly. So that idea’s going to be put in the bank for another project.
And the long slot skegs (like typical seakayak skegs) will put a long slit in the skin that in turn will want to gape open. Lots of side skin stress will have to be contended with that I think will be just asking for trouble. However the idea of a flat bottom plate that has multiple small holes drilled through that will allow the skin to be attached makes some sense. This detail will be kept.

The section detail of relating the skeg insert to a hull beam, close to a hull stringer and with the flat plate attaching to the rail looks like a decent approach for a base. Use the drilled out sewing detail in the paragraph above, use just say a ¾” square insert and a 1” round hole through the skin and I think we may have a system that’ll be possible.

A 1” hole in the ballistic nylon skin will not cause any skin gaping or shaping problems, even a modest plate size will give lots of sewing parameters and keeping it right on a beam will give the strength and support of 3 structural members – the rail, a stringer and a beam. This should be a good base.

If a separate template is used to make the perforated plate drill hole locations, it can be reused after skinning to align the needle when sewing up.

A skeg approach is now emerging . . .

So now there are whole bunch of ideas and approaches floating around. It is now time to make some definitive decisions and start the next major stage of really designing this little baby . . . .

there's an ongoing discussion in our forums about this project if you have any questions or comments.
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