It seemed a good time to update you all on the status of our various winter projects on the skin-on-frame outrigger canoe, A DEMANY CHIMAN. When we last checked in, I was trying to figure out how to approach the redesign of the ama, especially with respect to the problem of it shipping lots of water. I have pursued the initial approach (despite good advice to the contrary) and am some way along.
To review, I took the ama completely apart and gave everything a good sanding. I had found the bow piece in suspect shape, so I just rebuilt it. I then coated everything with the same polyurethane that coats the skin and lashed it all back together, but for the stringers. I then got some polystyrene and built blocks matching the dimensions of the four sections of the ama (including the stringers in the width) and then split those down the middle lengthwise. I filed / sanded them to shape so that they fit snugly and had the appropriate sectional shape. I am now 3/4 through the final step, which is carving out a channel for the stringers. Below is the starboard side, with one stringer just laid in.
Now I have to do the port side. I’ll paint them all so they aren’t that horrid pink (yes, in its regular life, this foam would be insulating some house).
A couple thoughts are in order. First, working with foam has been a highly unpleasant process. The mess is horrendous and shaping it does not have the same satisfying feeling wood gives. The stuff is obviously soft enough that it is easy to ding up and it snags much more easily than it seems it should. On the other hand, I think it will meet my objectives pretty well. By coating the pieces in polyurethane, waiting for a full set, and then lashing them, they behave like skin-on-frame construction should, but are protected form the inevitable water (yes, there may be wear and, over time, places water will get to the wood, but that will be down the line a decent bit). The stringers will show through and give the appearance they had, maintaining the same look. Finally, the water will mostly stay out, leaving me confident the ama will remain buoyant in a longer, choppy crossing. Perfect? No, but I think this will get me where I wanted to, even if the journey has been a pain.