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Old 09 January 2005, 07:56   #11
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Originally Posted by Tim M
I'm curious about this length business......


I've seen trunks which seem to be pretty standard and are probably what are all thinking of, whereby, there's a bit of hypalon glued into a tube shape which has to be kept up to avoid water entering the boat.

My trunks are flat (two pieces of pvc heat welded together), and are quite short (300mm ish). When the boat is at rest, they sit under water, but, because they are flat, water does not enter. However, when the boat is going on, they are not in the water, and so any water on deck drains out of them. This works really well, so why donít' more people use them?!
Know the type you mean - seen them on rescue boats although usually made of rubber - wondered how they worked!!! Look like the ideal setup - any chance of a piccy???
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Old 09 January 2005, 09:00   #12
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Old 09 January 2005, 09:58   #13
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Originally Posted by tue
I have fitted a ball type to another RIB at work which is below the water line and at rest there were no leaks coming in. Don't know what it'll be like after 6 months underwater though when it gets a little fouled.
I have found they do foul, we have em on the Gemini and it's a pain having to lean over the transom and immerse your arm in water to push the balls up to make the seal.

I have boat with trunks which I find ok and also our Scorpion has two rubber bung in the transom which is my favourite
Any chance of a Pic of your flat trunks Tim
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Old 09 January 2005, 10:03   #14
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hmm looks good

looks like aour posts crossed.

Do they have a device in them that keeps em closed or is it just the flat shape and if so will it keep it's tension over the years d'ya think
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Old 09 January 2005, 11:49   #15
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They just naturally keep their flat shape. Of course, when the boat's out of the water (which it is most of the time) gravity keeps them dangling down which helps to keep the shape. When the boat's in the water they tend to point upwards; again keeping a nice flat shape. Who knows how they'll be in a few years, but then they are very easy to change.
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Old 09 January 2005, 13:01   #16
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They do look like the same type as on the rescue boats - when I get a chance I will post the pics of the ones attached to a rescue boat on the Pride of Bilbao ferry.
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Old 09 January 2005, 13:39   #17
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Scuppers

If you are still wanting to go down the scupper route, speak to steve the boat, he does them through Nautequipe.
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Old 09 January 2005, 16:16   #18
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A lot of the water companies use the flat trunks as shown in the picture, in the strom overflows. They rarely get blocked and can be a lot shorter as the rubber is thicker, (10mm) but they do have a lot more pressure behind them! Depending on the type and quality of the rubber these can last for ages with minimal maintenance.

I've seen some boats with a combination ball and trunk system in the commercial world. But this was on a boat with a very low transom and the trunk did fill when waves were at the right angle. It was a good compromise and did not seem to clog. That said they did have a huge trolley on railway lines to launch and recover so fixing a clog was a lot easier.

Chris
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