by Alan » Mon Jun 22, 2020 12:52 pm
My 1980 DSII has three drain holes in the transom. The upper center hole is the cockpit drain. The lower center hole was meant to be a bilge drain but is glassed over, in a way that makes it clear it was done at the factory (this glassed-over hole is fairly common on DSIIs).
The third drain hole, at the portside waterline, opens into the hull cavity at the bottom of the portside seat. The area under the seat, and the starboard seat as well, is open all the way to the front of the boat and down into the bilge between the cockpit floor and the hull.
It sounds like you've got a drain hole for each seat area.
My theory on the drain holes is that the bottom center one was placed there because that's where it was on DSIs. Then someone realized that the DSII cockpit floor is so close to the hull at that point that there's almost no room for water to drain out. The solution was to glass over the hole and place a new one in the open area nearest to the center. That opens into the cavity beneath the seat. I've only got a portside waterline drain plug, but one in each side sounds like a good idea.
If your bottom center drain hole can be opened (some of them weren't glassed over), it might be interesting to look into it with a flashlight and see if there is enough space for water to drain.
GreenLake is right about raising the bow to drain the hull. I jack the front end of my trailer up until the bow is higher than the stern (using a couple of jacks and very secure supports, with the trailer wheels blocked so it can't roll).