One reference I have "OCeanography adn Seamanship" suggust the drain be at
least 0.1 inches squares per square foot of cockpit area for a 5 minute
drain. The P-19 (I've measured my P-19 "Cantrip") is roughly 5 1/2 by 4 feet
or 22 ft sq.. Double check my math by that's roughly one 1 1/2 in Inner
Diameter drain. Your double 1 1/4 drain should emplty the cockpit in less
then five minutes.
As for crossing I think the main advantage is the keep the water out in a
seaway. The Potter is so high and bouyant anyway that it would take a seaway
I'd rather not be in to wet your feet but on the other hand it might offer
survival.
Hope this helps.
Ray Menard
P-19 "Cantrip"