This weekend I was out happily sailing until a trimaran passed me and
I went into a slump tryin to figger out a way to make a monohull do
such speeds or to make a lightweight trailer sailer that is
seaworthy. Sure, some monohulls can plane but I dont really trust
such ULDB hulls in any seas. Maybe you could incorporate some
advantages of the tri-hull into a lightweight trailerable mono in
order to enhance stability though.
Make the parts of the hull just at waterline as an inflatable
bilayer. When you start to heel, the downwind side inflates creating
much greater bouyancy on that side resisting the heel.