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Old 23 March 2010, 18:34   #1
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Country: UK - England
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Help fitting elephant trunks

Hi,
I have a 5m searider with 75 Mariner 2 stroke. Whilst planing, the boat often ships a bit of water and I only have a manual pump. Would an elephant trunk solve this issue? If so, any advice on where to source and how to fit? just the one or two? at low speed do they need to be lifted or do they close sufficiently well?

You can tell form my questions that i am a bit of a novice in respect of these things... ready to tackle the job but wary of screwing it up! Any advice gratefully received.
Cheers
Dave
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Old 23 March 2010, 18:47   #2
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I hope someone can answer that question for you,as i would quite like to know how to use them.lol got a sib last wk and i have not got a clue
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Old 23 March 2010, 18:52   #3
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I assume you have a 'Deluxe' Searider with bucket seats, bonnet & windscreen, as it has no bailers fitted? The centre console Seariders have them as standard (2 usually on a 5.4)

The various toobers who are trade members on here: Ribshop, tidelbiz (Paul Tilley) & Henshaws (Christopher) should be able to sell you an elephant trunk kit. They also come up from time to time on ebay, or you could try an Avon dealer: BHG in Lymington stock a load of Avon parts
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Old 23 March 2010, 18:54   #4
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How do they work tho? if you don t mind me asking
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Old 23 March 2010, 19:01   #5
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Mine let a bit of water in when at rest on an SR4 but I leave them down if I having a mess about.
Dead easy to fit, drill your hole, seal the inside of the hole with a couple of coats of resin then sikaflex the pipe in the holes.
I also sikaflexed the trunks onto the pipes then used the jubilee clips.
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Old 23 March 2010, 19:03   #6
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Originally Posted by thornbackflound View Post
How do they work tho? if you don t mind me asking
Basically its like having a hole in the back of your boat that the water goes out of when you at speed.
To stop water from coming in you raise the trunk so the top of it is above the water.
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Old 23 March 2010, 19:07   #7
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How do they work tho? if you don t mind me asking
You cut a big 'ole in the transom and seal the trunk to the outside of the transom. When deployed, with the boat underway, the trunk should stick out horizontally (bilges here we come!) and the vacuum effect of the boat travelling on the plane over the water sucks out any deck water. The trunk is held in position by a cord fixed from the end of the trunk to a cleat on the transom. When the boat has emptied, you pull on your cord which will result in your trunk ending up in a vertical position . You can secure the trunk in this position by tying the cord to the same cleat. When the boat comes off the plane, the top of the trunk should then be above the water level, so the boat doesn't fill back up with nasty seawater.
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Old 23 March 2010, 19:14   #8
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Arh got you ,many thanks for the explanation, now i see how they work
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Old 24 March 2010, 04:04   #9
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Hi Dave

We sell a drain sock kit,
http://rib-shop.com/prodtype.asp?PT_...ageHistory=cat

Looking at your occupation I am guessing you work at Nats, We down the road just before your turning on the left, Coal Park Lane. You can always pop in for some advice.
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Old 24 March 2010, 05:28   #10
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I assume that the rubber of the trunk also collapses when at rest due to water pressure on the outside - that seals them against water coming in too....
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