Name: Bob McGovern
Even when they are the right size, they are too small. Before we took our MkI to Catalina, I wanted more cockpit drainage than the original scupper (which was just under 3/4"d) could provide in the event we got knocked down or pooped. Gotta get that water out fast! I drilled out the existing scupper to 1"d, then added a second 1" hole about 3 inches behind it. The second hole exposed the plywood in the cockpit floor; you can carefully seal that with thickened epoxy, using your pinkie to get coverage underneath. Then I recessed the nonskid around the hole and painted it with one-part polyurethane. The result was roughly 4x the original drainage area.
If you really fear a flooded cockpit, you could put a scupper out the transom -- one with a check ball or flap is best. Those drain real fast. Better have your hatchboard in, or it won't matter much!
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