Building Back The Chine Edges

This kind of boat will sail better to windward if it has sharp corners at the chines. Here is the backstory. A boat can only sail into the wind if it can resist being pushed sideways. There are a few way sailboats do this; fin keels, centerboards or daggerboards. All are some version of a paddle being stuck down into the water vertically. The Duo-660 is different, as far as I can tell Bernd is the only one using this design approach (Mathew Leyden has a similar philosophy but uses a different design).  Bernd uses the hull themselves, and adds anti-vortex panels.  The idea is to keep the high pressure side of the hull at high pressure and the low side at low pressure as much as possible. This will allow the boat to resist sideways motion while saving weight and complexity. So back to the sharp chines, water will have a harder time getting around a sharp corner then around a nicely rounded one. And we need the water to have as much resistance as possible to flowing under the boat so we can keep the relative pressures where they need to be.  Bernd has a paper written on this at his website here: AntiVortex
The reason why these have to be put back after fiberglass is that fiberglass fabric does not like to follow sharp edges. So the the approach is to round the edges for fiberglass installation, and then afterward to put them back with epoxy putty. here is my first iteration.

I say iteration since I think this will take a few applications before its right. Which is fine with me since we are having the hull-turning party on Sunday.  All I have to do before then is build back these edges and make a couple of cradles for holding the boat right side up and prepare all the regular party stuff (drinks, food, clean up back yard).