interesting thread. when i burped my previous dripless shaft seal i was surprised how much water came in. i dont know if my bilge pump could have kept up with that rate.
a related request for opinions on what you could do if the rubber seals/gaskets on a saildrive failed (apart from heading very quickly to the nearest haul out) - assuming for argument's sake the alarm between the diaphragms didnt go off or it was due, however unlikely, to the saildrive striking bottom. i cant think of anything obvious that would help, but perhaps i dont know my ass from a hole in the hull.