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Old 19 November 2008, 10:15   #1
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Searider waterline

Hi,

I have a SR5.4, I want to block the flooding hull and fit trunks. With this setup will the trunks let water in when sat on a mooring.
Obviously they will let the rain water out but how much if any of the deck will end up flooded?
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Old 19 November 2008, 12:48   #2
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my flooding hull is blocked off, The elephant trunks are well under water when at rest. i couldnt say exactly how much, beacuse last time i looked over the transom at rest two of us were right in the back of the boat trying to pump water out, and our combined weight made it pour in over the transom but when i had one leaking the boat would fill with water.
At guess i would say if you left one down you may end up with 4" or more in the boat depending on how much fuel you have on board.
i will have a look next time its in the water, if you havent found out by then.
I think the answer is trunks up and a bilge pump.
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Old 19 November 2008, 13:15   #3
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Quote:
Originally Posted by doggypaddle View Post
my flooding hull is blocked off, The elephant trunks are well under water when at rest. i couldnt say exactly how much, beacuse last time i looked over the transom at rest two of us were right in the back of the boat trying to pump water out, and our combined weight made it pour in over the transom but when i had one leaking the boat would fill with water.
At guess i would say if you left one down you may end up with 4" or more in the boat depending on how much fuel you have on board.
i will have a look next time its in the water, if you havent found out by then.
I think the answer is trunks up and a bilge pump.
Seconded.
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Old 19 November 2008, 14:39   #4
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It wouldn't matter how many trunks were down would it as when it got to the 4" it would stop, it would just they twice as quick?

My boat will dry out at low water so my theory was any water would drain out then? If I leave the trunks up all the time it won't drain at all?
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Old 19 November 2008, 14:42   #5
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My 5.4 had the flooding section open.

With the trunk down it floods almost to the engine cut out on the transom. had a 90hp 2 stroke on the back.

Bilge pump.
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Old 19 November 2008, 15:41   #6
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Originally Posted by chewy View Post
It wouldn't matter how many trunks were down would it as when it got to the 4" it would stop, it would just they twice as quick?

My boat will dry out at low water so my theory was any water would drain out then? If I leave the trunks up all the time it won't drain at all?
the water probably wont run out the trunks when it dries. When my boat is on the trailer it can get full of rain water with the trunks down unless you wedge a piece of wood up them to stop them hanging down and folding shut.
i think you have a choice either trunks down and a boat full of seawater or trunks up and a boat full of rain, the third possibility is a bilge pump, dry boat and a flat battery maybe a cover to keep the rain out would help?
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Old 19 November 2008, 16:40   #7
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A cover would be the best and easiest option but a pain as I leave my boat on a mooring.

Just had a quick search and some had an elephants that was effectively slit down either side and and reglued so the flats stuck together stopping water entering. Anyone had any success with these?

Thanks to whoever I borrowed the photo off.
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Old 21 November 2008, 14:28   #8
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Anyone ever tried one of these
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Old 21 November 2008, 16:13   #9
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After I had my transom rebuilt I had one of these fitted to replace the home made trunk.

Worked a treat - but the boat lived on a trailer. Not sure how it would be with a few barnacles inside?
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Old 22 November 2008, 05:20   #10
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Just had a quick search and some had an elephants that was effectively slit down either side and and reglued so the flats stuck together stopping water entering. Anyone had any success with these?

Thanks to whoever I borrowed the photo off.
Those were mine. Whilst effective for short-medium term use in the water, I think if a boat lived on a mooring with those it would still have filled up over time. I wonder if attaching a ping-pong ball or similar to the end of the trunk would work - it would float just about the surface when at rest, but would allow the boat to drain when underway.
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