Join Date: Sep 2008
Location: Victoria B.C. Canada
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It's not so much the volume unless it's very large, but the drain time. I've read 30 seconds is about ideal. Plug the drains and fill it with a hose and time it to get an idea. If more drainage is needed, and I would guess yes, the easiest solution it to put a drain right through the transom. The Tartan has the well gainst the transom so it's pretty easy to install an extra drain. Only one side is needed as the main drains will handle what's left. With a flap over the outlet it shouldn't let water in.
Living aboard in Victoria Harbour