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Old 15 January 2009, 12:30   #1
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elephant trunk drain on a sib?

I have a zodiac futura mk2. I operate in areas with large shifting surf (overhead sized breakers) and try to be prepared for the possibility of getting swamped. When heading out to serious surf or over a bar I move my battery up on top of my bench and strap it down. My electrical connections are all tucked up as high as possible in my console. I have a bucket for serious bailing, but the small drains installed on my zodiac sure don't suck water out very fast and are prone to getting clogged. I was considering installing an elephant trunk drain on my transom. Overkill? If the motors still running it would be nice to get water out of the boat fast. Anyone install one on a sib? Was it worthwhile?
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Old 15 January 2009, 12:59   #2
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Re:elephant trunk drain on a sib?

I have an old Avon SIB and it has elephant trunk drains on the transom.
I thought Zodiac did the same on the F470 - F550 SIBs.
I think you can even remove the bailers on the transom on some models and make some elephant trunk drains. The water pressure keeps the trunk closed
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Old 15 January 2009, 14:21   #3
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my little 3 .4 metre has 2 -4inch ones ,they work great i can fill the boat the the top of the sponsons and it will empty it underway in moments ,they do still allow a little water back in if they are left in the closed upright setting as they act like a funnel if spray gets kicked up ,but nothing to worry about ,the small zodiac diaphram type only seem good when new and are forever leaking and soon get glogged up with weed ect,even just one small elephants trunk type would make a difference and you can thread a chain through the hole if you want to stop the boat getting stolen .
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Old 15 January 2009, 15:27   #4
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Rescue SIB (about a 10 foot Zodiac) at Pt. Lobos State Park (California, USA) had a pair of 4" trunks.

Never saw the boat in action, but the ranger said the trunks worked quite well.

jky
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Old 15 January 2009, 15:32   #5
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Hi Kelson,

The 2 scuppers on my SIB are also 4" diameter, but are located a little higher up on the transom than the ones on Mart's boat (not sure what the rationale for that is). They are held in the up position by a simple hook (on the transom) & loop (on the trunk) system. So far, the only time I've needed to use the scuppers was this past summer when I had completely swamped my boat by stuffing the bow hard at the bottom of a large set of rapids. With the trunks lowered the water drained out (to the bottom of the scupper hole) in a matter of seconds. The remaining 1 1/2" of water gets pumped out with a manual bilge pump.







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Old 15 January 2009, 17:23   #6
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,


yours do seem higher up than most but i had a humber 16 ft and they were high on that too ,my trunks are kept up by pulling a thin cord and a clam cleat on the inside of the transom with a plastic stopper ball to stop the cord i going through the small hole in the transom ,,though i have seen them kept up with just small velcro patches , i like the frilly bits on yours lol, regards mart.
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Old 16 January 2009, 11:59   #7
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On my RIB the trunks are controlled by cords; they feed through the transom, hit a pair of clamcleats, and are stopped by a 3" long piece of PVC pipe (rather than a ball as on Marts) that also makes a nice grab handle.

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Old 16 January 2009, 12:17   #8
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Thank you all

Thank you all for the great responses. I particularly appreciate the pics posted by m chappelow and prairie tuber. Locally I don't not see many elephant trunk drains in use and there is a lot of skepticism regarding their value on a small vessel. The members of this forum are a creative and adventuresome lot! I am doing my best to prepare for the worst since I choose to flirt with disaster. I appreciate the guidance.
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Old 16 January 2009, 12:57   #9
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I like the frilly bits on prairie tubers trunks.

Very twee.

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Old 16 January 2009, 13:11   #10
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if you want to see how good they are in practice have a look on youtube and type in D CLASS LAUNCH RNLI you will see why they are the best type .
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