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Old 30 July 2012, 08:32   #1
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Taking on water, in a RIB?

I have noticed that my boat takes in a fair bit of water (undo the bungs and watch it pour out, but does not pour out of anywhere else). Although performance doesn't seem to be badly affected, I would like to know if its normal for a RIB to take on so much (more than a few gallons) water?
All seams/joints appear sound (inboard and outboard), hull is not holed, bungs are tight and have seals.... just can't work out how it's getting in!
Any ideas greatly appreciated.
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Old 30 July 2012, 08:33   #2
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leaky bungs?
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Old 30 July 2012, 08:38   #3
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Hi Pikey, bungs are good both new and well bonded to hull with sealing rings intact on threads.
I wonder if it can get past the tube/hull joints anywhere, but have checked all round.
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Old 30 July 2012, 08:42   #4
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Mmm seems excessive to me.
Ours take on ZERO after spending time on a mooring..
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Old 30 July 2012, 08:43   #5
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Leaking bow through hull eye or U bolt perhaps.
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Old 30 July 2012, 09:14   #6
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All through hull fittings are sound.
I can only think it must be bung problems, despite regular checking. Can anyone explain how the tube/hull joint is made, I think I know but I might be missing something here.
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Old 30 July 2012, 09:30   #7
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In the last ten years of dry stack launching and recovering 100's of ribs, I would have to say that with a very, very few exceptions, all ribs take on water. How it gets there I don't know - like you it doesn't appear to come out anywhere else.

I suspect it's a combination of deck fittings, through hull fittings, bungs, tears of joy from the lucky owners, etc.

Out of interest, the ONLY rib we have that NEVER has any water in the bilges is a 5.5m Tornado. That actually has the opposit in as much as when you take the bung out it lets out a small amount of pressurised air!!!! You might guess what it's nickname is!
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Old 30 July 2012, 09:42   #8
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Thanks Dry Run,
Wish mine only farted when de-bunged.... and the rib.
I think an auto bilge pump is in order (manual already fitted but takes the fun out of ribbing).
Nice to know its not just mine, I was wondering if I'd bought a pup.
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Old 30 July 2012, 09:50   #9
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Rain,Rain,Rain + washing down boat afte use + more rain, rain, rain, + any sea water, spray from a run out.

If it has rained a lot there is usually a good stream coming out.

The guys at Cobbs Quay Dry Stack do an excellent job, each time boat is put back the transom bung/plug is removed and each time it's taken onto the fork lifts for putting back in the water they wait a minute or two for the rain water to drain out before fitting the transom bung/plug back in. Even with a good cover fitted rain water will get in and you will be surprised how much water collects.

Perhaps do a test, wait for a few rainey days and measure amount coming out and also leave in water for a few days and measure what comes out, through combination of testing you might find where the problem lies but might be difficult.
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Old 30 July 2012, 10:05   #10
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Nice thought, but the cover has never let anything in (even this year!), the take up is always when in the water and/or under way.

Nothing to get damaged by it... just like to know.
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