'Edge Hull (Chine) Shape

[philcanoe]

not copyrighted - from: Hydrocarbon Processing, 1981 April

[Craig Smerda]

As far as pulling the thwarts in, does this not round the bottom out (which I understand is not a good thing) and decrease the secondary stability (which may or may not be a good thing, depending), and decrease the rocker, which will improve tracking at the expense of manoeuverability.

From my past experiences pulling in Ocoee's and with the L'edge when you pull the thwarts in it mainly changes the flare and has little if any effect on the roundness of the bottom of the hull mainly due to the boxy-ness of the inital hull design. When you change the flare (create less of it) you essentially change the waterline by allowing the boat to sink further into the water and increases the amount of sidewall/edge that interacts with the water. Increasing the waterline by pulling the thwarts in can improve upon speed but the more you pull it in the more you decrease it's overall stability.

This make sense?

I would never bother pulling in a round hulled boat. See the picture of the SpanishFly as an example.

[philcanoe]

could you even pull in a S'Fly ?

[Craig Smerda]

could you even pull in a S'Fly ?

I made some test thwarts from scrap pine one day that were an 1" shorter and took the boat down to the lake... paddled it around for about 15 minutes... went home... removed them and threw 'em straight into the garbage can.