by Roger » Thu Jun 12, 2008 12:10 am
John,
Water inside the cockpit theoretically never gets into the bilge. While sailing and the dePersia bailer open, it drains directly from the cockpit through the drain tube to the outside of the bottom hull.
At a mooring, with the mooring drain open, rainwater in the cockpit fills up until to flows out of the upper hole in the transom. It is above the waterline and water in the sump should never get deeper than about 4".
Water that gets into the bilge, (the area below the cockpit) can get in through holes, cracks, loose pivot bolt washers, the cb uphaul, hull deck joints, inspection port screw holes that are poorly sealed, and leaks in the hull deck joint and deck hardware. Water in the bilge can only be drained through the bilge plug, (lowest hole) at the back of the transom. Those holes you describe are likely made by a previous owner and I can only guess at their function. The floatation in the seat bottoms was factory installed. Yes I did add inspection ports to install a mid cockpit traveller, and had to cut through foam.
The layup is not solid at the lowest part of the aft transom. The void bewteen the inner and outer hull is indeed only about 3/4" high however. the dePersia bailer tube spans this void, and the bilge drain is also immediately behind it. If you were able to see into the bilge drain, you would actually see the tube of the dePersia bailer. Water flows around both sides of the tube to the hole in the transom. As you can likely guess this is an ideal place for debris to collect and get trapped due to the narrow passages. Owners often sealed this hole over and made another hole off to one side.