March 26, 2010

Build A Dinghy Part 19: Fastening inwale blocks and quarter knees

Here, I spaced the inwale blocks evenely alongside each side of the boat--taking into account the eventual position of my oarlock pads. To make sure they were even on each side (remember, these are curved surfaces) I used a technique called "horning." This entailed affixing a length of string at the bow and running the other end to a block, then swinging the string across the boat and placing the other block at the same length of string. Sounds weird, but if you visualize it, its simply creating a "virtual" isosceles triangle (Thats the one with at least two equal sides.) I clamped the spacer blocks in position, remeasured, the set back and eyeballed everything. Looked good, so I taped off the mounting line. If your sharp eyed, you'll note that the blocks are set a hair higher than the sheer of the boat. This is to create some flare or camber. Once the rails are installed, everything will be planed down flush, creating a slight outboard crown. I applied straight epoxy to both the boat and the blocks. Then I overcoated with thickened epoxy and clamped the blocks in position. Since the temps were to drop into the 30's overnight, and epoxy likes at least 50 degrees to cure, I created a tent over the boat with a blue tarp. I then placed a pair of 100 W worklamps in the boat. This kept the temp on my glue-up at 61-degrees F in my unheated boatshop --er, garage.(LOL)

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