Rational Root
04-02-2009, 07:00 AM
I joined the chine to the stem a little too far aft, so I laminated up a piece to sort the problem. You can see the white glue line (epoxy and filler)
Even with my lamination, my chine is too far inboard. It's not a great picture, but that grey thing is a straight edge running from the stem to the sheer strake. I have started bevelling the sheer strake, but the straight edge is still sitting on wood that will be faired away. But not much. Even when I finish fairing the sheer, the chine will still sit inboard of the straight edge.
I think my lamination was too sharply tapered. I will either add another lamination, or plane it back and add a single less tapered one. I suspect I'll build it up with ply tacking into place first to see exactly how much I need to build up.
http://lh6.ggpht.com/_-jLgHzfXWAU/Sc_b0PZqU2I/AAAAAAAABEg/mZ36Ec2TkwU/s400/IMG_0454.JPG
I eventually decided that it would be better to remove the first laminate, and replace it with a correctly sized one, rather than try to just add more laminates and fair them down.
There is a concern that White Oak does not Glue up well with Epoxy.
The only way to remove the laminate turned out to be cross cutting it down to the glue line every 1/2 inch or so, and chipping it out with a chisel, just like cutting a housing for a lap joint.
Even doing this, in most places the wood did not come off at the glue line, A sander with 80 grit will tidy up the mess this weekend.
I used some scrap ply to see how much extra material I need on the chine to ensure that the side and bottom planking meet at most at a 180 degree angle. It's about 5/8"
At least I know what I need to do now.
I suspect some more time in the Thinking Chair before I set to it.
Even with my lamination, my chine is too far inboard. It's not a great picture, but that grey thing is a straight edge running from the stem to the sheer strake. I have started bevelling the sheer strake, but the straight edge is still sitting on wood that will be faired away. But not much. Even when I finish fairing the sheer, the chine will still sit inboard of the straight edge.
I think my lamination was too sharply tapered. I will either add another lamination, or plane it back and add a single less tapered one. I suspect I'll build it up with ply tacking into place first to see exactly how much I need to build up.
http://lh6.ggpht.com/_-jLgHzfXWAU/Sc_b0PZqU2I/AAAAAAAABEg/mZ36Ec2TkwU/s400/IMG_0454.JPG
I eventually decided that it would be better to remove the first laminate, and replace it with a correctly sized one, rather than try to just add more laminates and fair them down.
There is a concern that White Oak does not Glue up well with Epoxy.
The only way to remove the laminate turned out to be cross cutting it down to the glue line every 1/2 inch or so, and chipping it out with a chisel, just like cutting a housing for a lap joint.
Even doing this, in most places the wood did not come off at the glue line, A sander with 80 grit will tidy up the mess this weekend.
I used some scrap ply to see how much extra material I need on the chine to ensure that the side and bottom planking meet at most at a 180 degree angle. It's about 5/8"
At least I know what I need to do now.
I suspect some more time in the Thinking Chair before I set to it.