After seeing that video, I agree, there needs to be alot more volume in the ama's. You can even see the ama being completely pushed under (capsize) when being loaded up upwind.

Submerging the ama's that far and that quickly when broad reaching can indeed only end in a pitchpole. Nothing stops a sailboat then dragggin a 2.5 inch tube with attached trampoline through the water.

Basically a nice concept but it could do with a few refinements here and there.

Wouter