Originally Posted by breezeblock
this may sound silly but what do you mean
Well, use HPs analogy, a narrow beam is "sharper" so in a following sea, I.e. The waves/swell behind you, as you slide down a wave into the trough, a narrow beam is more prone to burying it's nose into the base of the wave in front. This causes a rapid halt with water over the bow, in extreme cases the wave behind you (that you just slid down) now comes over the stern & swamps the boat. A wider beam has a "blunt" profile & is less likely to stuff, preferring to ride up the back of the wave. I've been in an Attaque sat up to the tube tops in water after a particularly impressive stuffing. Any boat will stuff given the circumstances & careless handling, but narrow beams are less forgiving.
Lions led by donkeys