Adding a drain plug in transom

Thread starter #1
Hello all-- I have an older model Sunfish to which I'd like to add a transom drain plug (a previous Sunfish I used to sail had one, and I grew to appreciate it).

I have a plug and a drill, and it seems like a very simple add-on. Should I be concerned though about drilling into a support structure? Or is the transom just one unimpeded piece all the way across? I see from diagrams online that there are foam blocks on either side, but these (at least from the diagrams) don't appear to run all the way to the transom.

Thanks for your input!

--Peter
 

Webfoot1

Active Member
#2
Nothing in the way, go for it. Don't have a exact location but
as low and close to the center of the transom as the rudder mount
allows would be best.
 

sailcraftri

Well-Known Member
#3
I always install mine on starboard side close to center line as and low as possible. Don't forget that there is about 3/16" laminate thickness in that area so you want to start your hole with that in consideration.
 

L&VW

Well-Known Member
#4
I installed a small rubber/brass transom drain plug designed for bait wells. (And posted of it at this forum).

While it's handy, the very thin material of the transom would have me adding reinforcement, such as a glassed-in brass sleeve. It's difficult to make a clean and round hole, due to shredding. Smoothing the hole with resin will help.

If you're using a plastic drain plug, such as the deck drain plug replacement plug, things should go better. Of course, it should be installed with a sealer.

.
 
Thread starter #5
I always install mine on starboard side close to center line as and low as possible. Don't forget that there is about 3/16" laminate thickness in that area so you want to start your hole with that in consideration.
Hello-- thanks for the tip... As far the laminate goes, is that something that tends to shred or tear during drilling? I have a center-hole punch, so I figured I would use that to create a small recess to allow for cleaner drilling from the start. Thanks again,

Peter
 
#8
Hello-- thanks for the tip... As far the laminate goes, is that something that tends to shred or tear during drilling? I have a center-hole punch, so I figured I would use that to create a small recess to allow for cleaner drilling from the start. Thanks again,

Peter
A center punch wont do much. I'd predrill a very small diameter hole as a starter. A whole saw/bit might drill a cleaner hole, but a sharp drill bit works as well. Chipping isn't a real problem if you are installing a full drain plug assembly,

as it will cover most chipping. If you are really worried about chipping though, a couple techniques to limit chipping include:
  • drilling through masking tape on the hole
  • running the drill/saw bit backwards till it cuts through the gel coat.

As long as you make sure the bottom of the hole is at least 1/2 or so above the "bottom" you'll be OK.

Mike
 
#9
I really like the concept of having a drain plug in the back. It would be much easier to drain and more natural for the boats position.
 
#10
Mike,
I think I like your approach the best - maybe costs a tad more for a drain plug assembly, but will look much cleaner.

tag
 
#11
I would just fix the leak.
Once the foam is wet it holds the water and you are only draining the non absorbed water so over a period of time the boat will get heavier.
 
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