As required for the Nats I duly checked my buoyancy yesterday and left the hull floating up side down and on its side for about 30 minutes. After the test the port side tank had about 2 litres of water in. What are the most likely places for the water to get in? The hatch covers were very tight. How do I test to see where the leak is?
Finding a leak can be a bit like finding a pin in a haystack, of pins.
If it is a side tank, the usual place for them to go seems to be the base where the inner wall meets the floor inside the cockpit.
This takes a battering from feet when you are moving across the boat. Check for any movement along this seem.
Also what are the inspection hatch seal like, they tend to be rubber so can perish
A suggestion I saw on a Firefly forum a few years ago was to get a light (bulb on the end of a piece of wire) that you will be able to feed inside the tank. When it’s dark put it in and see if there is any light coming from any seems. I will admit to never trying this myself so not sure how effective it is.
If it helps, we test the tanks at work by connecting an air hose to the drain plug and pressuring the tank. If you hear air coming out run a bit of water where you think it is. If it bubbles, you have found the leak.
Thanks for the suggestions. I checked the cover seals were ok. I do not have drain holes to pressurise the tanks so will need to be creative to pressurise the tank slightly. I think I shall try passing a pipe connected to a pump through a fat sponge stuffed into a tank cover hole. Meanwhile I have weighed the hull and rigged the boat…. so many ropes and pully blocks, not a job to do often when compared to my Laser. Last thing to sort is the sail numbers as the best suit have 18?7 on. Should be
OK for a test sail on Thursday.
If you have an old hatch cover that fits, and an old inner tube with a valve on it.
You can cut the valve out of the tube with enough material to make a decent flange.
Drill a hole just bit enough in the hatch cover and feed the valve through from the inside. The copious amounts of glue and tape to make it air tight (as much as possible). That should do the job.