To begin with I continued planking. I found it helped if I wetted the planks well and left them overnight to soak and for some pieces I even steamed the ends a little where the twisting and bending was at its greatest. I also found the tacks weren’t quite driving home tightly as I would have liked and there is some bouncing of the ribs against the form. but it is easily remedied later on at clenching stage.
At the bow and stern, I also had another problem that was not mentioned in books or forums although a passing mention was made of some builders having it and they have different approaches to getting around it. It seems I had ended up with some gaps between the planks where they diverged at the end of the hull.
None of the books I have read show this happening. Anyway I continued planking whilst trying to think of a solution which I shall come to later. I also replaced the split section at the top of the picture! Once the planking gets to the point where it runs out of metal backing on the form and is a plank or two from the sheer-line, it is almost time to remove the hull from the form. Before that the tacks are punched in and the hull damped down with warm water then left overnight. The plastic is on there to stop it drying out before the wood has a chance to swell.
This wetting allows the dents made by the hammer to swell back up before sanding. Unlike the strip built canoes I make, wood canvas canoes do not require a great deal of sanding on the outside as the hull is covered with canvas. The purpose of sanding is purely as a fairing operation to smooth the contours to shape. I begin with my fairing board working across the planks to knock off the high edges and then I go over it all again with my orbital sander taking care not to make any flat spots.
Sanding of the bow and stern is not complete as these planks are still loose and of course the sheer planks have yet to be fitted.
Before we can proceed any further the hull has to be removed from the form.The clamps are removed from the gunwales and I was quite surprised by the amount of spring back that the hull exhibited. You can see this from this picture I took from under the gunwale edge.
This is normal and as you will also notice the ends of the planks are not yet tacked to the stems. This enables the hull to be removed from the form.
Once removed, the hull is placed upright on trestles and you get to see the skeletal insides in all their glory! That’s where I shall leave it for now and next time join me when the gunwales and stems will be joined together.
Alick
