Yes they were standard on many boats and most older boats have them.
Yes they should be pluged when sailing as leakey tanks is a big
problem on older boats. I recomend on using a little teflon greese
and that you close them up pefore going sailing. If you keep the boat
under cover at home then I would open one of the inspection ports
when the boat is strored. If you have to keep it out side then you
can open the plugs to allow the air in the tanks to expand and
contract. later after you go sailing on the boat and turn it over you
can check that your tanks are sound by tipping the boat up and
checking for water in the tanks. If you find water in your tanks
after sailing it means you have a problem that will need to be fixed.
I recomend that contact Ralph at that point as he has come up with
the best method to fix it if you need that.
:: I am restoring my 1960s Fiberglass Windmill (built by :: Morgan) Hull #2798. The project is almost complete and :: my question is regarding inner liner drain holes. :: :: In the inner liner, on both starboard and port sides, :: very near the transom and at lowest point on the side, :: there is one hole on each side to allow water to drain :: from the side chambers. Can anybody tell me if these :: holes were part of the original design or added later :: for drainage? AND ... if you have these holes drilled in :: your fiberglass Windmill, do you plug them when you are :: sailing? :: :: I have never had a problem with these drainage holes :: before, but if they are supposed to be plugged I want to :: plug them. :: :: Thanks,