Sometimes when it's blowing hard enough to push one bow under, you might want to use the added lift of having the other bow in the water too, vs. putting the weight of the boat and yourself and the drive of the wind in the sails, all on the one single bow, as when trapping downwind.
You can trap out and still sail on two hulls, as you can sit in and sail on one.
For me being out in trapeze means the ability to have the apparent wind more from forward, which means faster boat speed for same course to the true wind, but not more pressure on the bow.
On my boat the noses dive only in the accelerating phase, if I or my crew sheet in to fast, or if I bear away to fast, but not in the top speed phase. The best way to avoid violent bear-away is to be in the trapez
.
But this could be different on different boats of course.
Cheers,
Klaus
