I think I'm one of them that you're talking about. I liked every aspect of my kayak when I first built it, except that it turned way too easily. I was always having to do correction strokes just to keep in a straight line. I've since added a fin to the back end and now I love the way it handles. I believe that the other kayak builder you're talking about did the same thing too.

The problem is not the software, it's the fact that designing a kayak is a learning experience. I learned quite a bit about the design and I think I know how to modify my design to make it more like I want it to paddle without the addition of a fin.

Remember that the Guillemot that you're paddling is a 7th generation kayak. Very few people will get the exact kayak they want on the first try.

I agree that if you don't want to take the risk of building several kayaks or modifying the first one to suit your needs, then don't design one. Find a design that you like and build it.

I've thought about modifying my kayak and making a generation 2, but I like the way the Redfish King paddles so much that I'm going to build it next.

: The link below will take you to a page on the Mariner Kayaks website where
: you can download BEARBOAT for free. Be advised though, two very
: accomplished members of this BBS designed boats from scratch only to be
: very unhappy with aspects of their performance. I don't know what your
: level of paddling experience is. If you're just starting out, it might be
: wise to paddle a lot of different boats, try to figure out what elements
: of their design affect the performance characteristics that you like, and
: go into the design phase with some idea of cause and effect. Good luck to
: you.