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Evolution of
Lutra Wings
A Decked Sailing Canoe - Part 2

by David L. Nichols

Review Part 1

Editor's note: Designer, Builder and instructor David Nichols has contributed before and now his plans are featured in our store. Now is is building the prototype of a sailing version of this latest addition to his Lutra series of lapstrake canoes.
This shows the location of the mock up center board and forward bulk head.
click to enlarge
click to enlarge
Here both the forward and aft mock up cases are in place along with a forward water tight bulkhead for storage. The sheer is also temporarily set.
A close up of the aft mock up and the location of aft most bulkhead. I have trimmed the sheer to the outwale at the point.
click to enlarge
click to enlarge
I’ve established the location of the aft water tight bulkhead for storage and placed the knees that will support the combing.
All six knees are in place and the stiffing beams for the combing have the slots cut and the beams are dropped in. This will provide support because here the combing acts as a seat for hiking out.
click to enlarge
click to enlarge
A close up of a knee and the combing support. I’ve laminated 3mm and balsa end grain to make the knees light weight and strong. Knees made from 9mm would also work and be less labor intensive.
Here all the bulkheads and both center board cases are in place. The bulkheads have been epoxied in place but the center board cases are not. The camber on the bulkheads has not been cut.
click to enlarge
click to enlarge
This shows how to make the camber jig. The maximum beam at the bulkheads is 31 inches and I want a 2 ½ inch camber to the decks. I’ve gone up 2 ½
I’ve joined two battens where they cross the maximum beam of 31 inches and the height of 2 ½ inches. I’ve drilled a small hole for a pencil where the two battens meet.
click to enlarge
click to enlarge
Here I’m using the jig to scribe the camber on the aft most bulkhead.
The pencil line shows the arch and it’s ready to cut. The camera lens has distorted the line somewhat and it doesn’t look symmetrical. The next step will be to cut and trim to the line.
click to enlarge

On to part 3