Join Date: Jun 2005
Location: New Orleans
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I'll try, here's what I think...
Your large plug is a cockpit drain, it probably works only when you're going fast, so that the speed of the boat either drains, or sucks, the cockpit water out.
The small drain plug is from the transom, not the cockpit. It drains water from the hollow part of the hull itself.
If this guess is correct, you want to make sure you have no water inside the hull void. The 'free surface effect' (google it and you'll understand it better than I could explain it) plays havoc with your hull stability. The water in the cockpit (larger drain) is more noticeable but less serious, since the cockpit is a smaller area for the free surface area to affect.
In any event, "dry is better". Keep the hull void dry. The cockpit you can't always keep dry, but if it takes water, it's supposed to drain out quickly.
Kindly tell me later on if my educated guesses "hold water", as my cousin Vinny used to say.....
and have fun sailing, which is ultimately the whole point anyway....