Ama Daggerboard Location

That is a foiling trimaran with the ama front foils intended to provide verticle lift not stop leeway. In floating mode the hull shape is supposed to provide lateral resistance. I guess if the OP is intending to design a full flying trimaran it may be a decent base model, but otherwise I doubt it.

Even the other foiling trimarans have pulled their foils back behind the front crossbeam with the MOD 70's preserving their daggerboards. The daggerboard exit the hull forward of the mast, but have a substantial amount of rake to get the CLE back far enough.

 

Thanks but I am not designing a tri only trying to understand why the designer of a tri I'm looking at chose to position the daggerboards so far forward. The boards are canted inward to provide lift but not as much as the angle on the Catri. His reasons had to do with the dynamic of "shared lift", but after sailing her I fear that being able to balance the boat by trimming the sails has been sacrificed because of the daggerboard @@

 

Macif

What what it's worth the ama foil on Macif is quite far forward:

Picture by Alexis Courcoux--

 

Greg, I dont agree with that. While foiling the weather helm would be even worse, since the hull doesn't help at all.

The foils have a 55 degree angle to the water, so they provide more leeway resistance than lift.

I think the key is the huge rudder. Looks like it has more area than one dagger board.

 

Tri board-lateral resistance

From my experience this closely approximates the board position on a tri for ideal balance with the effect of beam considered:

 

Except that the sail plan CE moves really far forward thanks to the spinnakers. If I remember correctly the ama foils are not deployed below ~22kn of boat speed on the MOD's, basically they are high speed down wind foils only.