: I'm working on my interpretation of Brian Schultz's F1 (in link) using Tom
: Yost's design. Using GIMP (open source software similar to photoshop),
: I've come up with all the necessary numbers and copied them onto plywood
: for cross sections. The problem is that pointed out by Aaron H. where the
: diagram is somewhat ambiguous as far as the 'knuckle' or secondary chine
: on the gunwale. In a total worst case scenario, I'll be off by up to 3/4
: of an inch. I've never even paddled on the ocean before, and am not going
: to have any idea as to whether or not the finished product is any good. My
: question is: how could being off by 1/2" in this area impact the
: performance? Should I worry about it a lot or will it not be too big of a
: deal? I'm about ready to cut, and the entire point of this build was to do
: something quickly, so I'm sort of anxious to just jump right in. On the
: other hand, I can't throw away over a hundred dollars....

: If anyone is able to help interpret that diagram, that would be awesome as
: well. Without further clarification, I'm going to assume that on the cross
: sectional view (the one with the numbered sections), the knuckle line
: marks the outside of the center of the knuckle. It seems closes to the
: actual measurments when compared against his dimensions. Some things
: aren't quite lining up - he says the gunwales are 2.5", but in the
: cross sectional view, the line segment from the top of the gunwale to the
: knuckle is 2.33" according to my method of scaling which appears to
: have worked beautifully with everything else. I considered that the
: discrepancy was a result of the line being from the top corner of the
: gunwale to the top corner of the knuckle, but that distance would actually
: be ~2.03". Go figure.

: The real point is, does it matter?

: Image hosted on Brian's site: http://www.capefalconkayak.com/f1surveyweb.jpg

Hi Mike,
The easiest way to get the lines right for the knuckle would be to just add the 1/2 x 1/2" to the outside bottom edge of the gunwale, keeping the gunwale angle correct.

Hope this helps,
Mike Savage
South West Cork