One downside to this idea is in some sea conditions with following waves water might be able to push back up into the cockpit. Of course you could just add extra cockpit drains (for a total of 4) at the aft section that drained out the transom as well.
The reason the current configuration works is that the cockpit drains that are forward (closest to companionway) drain into a pipe that drains out of both sides of the boat at the waterline so when the boat is heeled there is always room for excess air or pressure to escape out the other side and drainage is possible. I have heard of other T27 owners enlarging the drainage pipes for the cockpit drains from 1" to 1-1/2" or 2" pvc pipe (I suppose the thru hull holes might have been enlarged too - but don't rely on my guesses as to the pipe diameters).
What are you people doing that your cockpits need to be drained so quickly?
As far as resistance I would submit that my cockpit drain thru hulls do not stick up at all on the surface of the hull and I have noted that they are a little small in size ( 1/2" ?) so I am not that worried about resistance from this thru hull hole. I do race our T27 sometimes and am always looking for advantages if possible. Next on my list is to implement a boom vang on Odalisque.
We were out on her this afternoon/evening on the Hudson River near Nyack, N.Y. with winds ranging from 5 - 30+ knots. Getting the rail in the water convinced me that we needed to reef and furl. We had the GPS running and had speeds hitting 6.1 or so with a comfortable speed of 5.9 or 6.0. Once reefed and furled we still hit the same speeds with a lot more comfort or less heel. Even racing in certain conditions it is a good idea to reef and/or furl as you can go just as fast with a lot fewer blow downs. It is a great boat and can endure a lot of weather if that is what you want to do. Just shorten sail occasionally.
Caleb
#328 Odalisque, 1967

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