i think the 2 boats are about equal in almost every way (except hull shape due to lack of boards on the P)
but weight limits and speed are about the same
the P has a lower portsmith rating but i would guess this is due to its lack of boards (tacks slower, doesn't point as well)...
PS i would argue "spread out weight" is slower than weight in the correct placement (on any/every boat) :) i suggest you experiment (with a gps) :)
I think there is a lot more volume in a P18s hulls than the H18. The H18s that I have seen all have dagger boards and probably will point higher. The better skipper wins the race.
A lot or not it is hard to say, I park next to a H18 at Wilmette. My thinking is at the bow and stern, they seem to have about the same dimensions. Between the cross bars however, the P18 hulls are just as wide and a lot taller. I think we need to fill a couple up with ping pong balls and start counting.
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I sailed my P18 w/ 400lbs on the trapeze flying a hull in medium wind.
If have seen masts break with that much weight on the wire (plus a skipper inboard) in heavy air
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Question for Andrew: 400 to 500 pounds is two big men, are you saying it is ok to have this much on the trapeze, if there is no man inboard, or are you saying two large men are pushing the limit of the double trap under any scenario? Thanks for clarification.
I am no engineer, nor have i been "around" cats all that long, but it is my understanding that these cats are built for 2 adults, in strong winds and anything more is putting stresses on these frames are not built for.
I have seen (pictures of) a brand new f16 crumble in 1/2 with 2 lighter adults, i know of masts breaking with 3 adults onboard in heavy air (6 meter cats) ...
I think if you push the limits.. something will give...
I read somewhere that every 7mph increase doubles the stresses on your rigging