Over the winter I plan to make models of Rescue Minor and Shoals Runner to compare them. This should iron out these questions about how developable the panels are. It's really a question with SR too, since Atkin tells us to build the sides in the three plywood batten-seam strakes! makes me think that maybe they really aren't conic sections!
And you're definitely right to doubt making those bends in 3/4" ply. I too think 1/2" would likely be pushing it. I'd figure on laminating. The upside is that this will make a stiffer structure anyhow. Of course you could probably go lighter, except on the bottom where weight aids stability. It would not be too far off the mark to make the bottom with 2 x 3/8, bilges and decks with 3/8, and sides with 1/4. You'd get the same speed with a bit less power. Or more payload.
I think it's going to be challenging getting the chine panels to bend
into shape with ANY sheet material - forget the 3/4" specified, and
I'm doubtful about 1/2".
And, as I've mentioned, the chine shape does not seem to be
fully "developable" in the bow, midships transition area, and (maybe)
in the tunnel. It would be nice if somebody with access to a good
CAD program could work this out! There are a number of places where
the panels wound up 1/2", 1" or more from where the offsets say they
If I were building this boat as designed, I would be very careful, and
have everything laid out by computer first. I believe that Atkin
never really "finished" the design.
Curtis (aka Sal's Dad)
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