: I was thinking about this and some boats have a flatter run along
: the middle of the boat with a lot of upsweep at the ends. Maybe
: this is what your expecting instead of a steady curve? Just a
: thought.

Most kayaks have a pretty much continious curve in the rocker, some have much more than others, but most have a gentle arc as a keel shape. There are some that have the rocker deeper more forward or more aft but still it's a pretty much continious curve. I know for example that my "new" canoe has it's max rocker very far forward, seems to me to be an odd shape, works well though.

Bill H.