8ft x 28" x 3 3/4" full length concave that starts narrow through the double hull entry and flairs to full width in the middle. Then it tapers out between the fins , but has a chine that flows off each side through the fins. This is a blow up of the recent Hydro Simmons I have built in wood and in foam and glass.
Flat out through the middle , but a chine down each side through the fins.
The 4ft 4" s 22" and the new 5ft x 22 1/2" simmons
The split tail loosens it up and works well with the quads.
Full length concave that blends to full width in the middle and tapers out through the fins with a rolled off chine on the outside of the fins in the tail as well.
These are Scarafini keel fins
Both boards are finished in a resin coating with no cloth and have come out great. A lot less weight is added than if it was glassed normally. The resin soaks into the wood and seals it and toughens it a little and then you can wax the board. It is tougher than raw wood with lanolin but not as tough as if it were glassed.
This is my first go at shaping a tri plane hull and I am very please with the outcome
It is quite fine and has quite pinched rails all round
The Greenough 4a fin should do the trick
It has only a very slight rocker and a rolled bottom that blends into a more pronounced V through the tail and the fin. It also has a flat planing surface most of the way that create the tri plane contours and it should by rights sit and plane on that surface.