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Old 20 August 2018, 02:22   #1
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Under deck trunking

So new boat, new under deck trunking to fit. As per the old boat I'll be running flexible conduit with custom made fittings at the ends to poke through the deck. Unlike the old boat, the new hull void drains into the rear well so can be easily emptied. The last hull had sealed trunking to prevent water entering the hull but over time, the inside of the trunking got damp and turned into a public health hazard. I'm considering putting perforated trunking in the new hull so it can dry out. What are people thoughts on this? Are under deck ducts usually sealed or draining?

Phil
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Old 20 August 2018, 02:35   #2
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Some form of pipe with smooth inside walls would be better perhaps than anything which has holes or is ribbed inside due to its fexible nature, point is at some point someone might want to run new cables through it for electrics, electronics or throttle, gear or hydralic lines and if the pipe or conduit isnt smooth it may be a job getting anything through.

and when installed make sure you run a line of some sort through more than twice its length to use for pulling other cables through in the future.
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Old 20 August 2018, 03:27   #3
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The conduit I have is smooth inside and no problem to add new cables to. Is just the gunk that grew in the last one was foul. My thought was that a few well placed drainage slits would allow moisture out and keep it a little cleaner in there.

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Old 20 August 2018, 05:19   #4
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So new boat, new under deck trunking to fit. As per the old boat I'll be running flexible conduit with custom made fittings at the ends to poke through the deck. Unlike the old boat, the new hull void drains into the rear well so can be easily emptied. The last hull had sealed trunking to prevent water entering the hull but over time, the inside of the trunking got damp and turned into a public health hazard. I'm considering putting perforated trunking in the new hull so it can dry out. What are people thoughts on this? Are under deck ducts usually sealed or draining?

Phil
my ribquest had land drain pipe the light weight stuff loads of holes in it to drain into the keel drain
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Old 20 August 2018, 09:53   #5
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Keep it smooth flexible (no holes) wider than you think you need it...incase you need to add stuff ...(and you will) with plenty of strong pull through cord (each end) then do your best to keep both ends high enough/sealed so water Ingress is minimised
Fairy liquid is a good choice to lubricate the cables and help ease to them through the conduit.

.....All I want in my keel/Hull is maybe a little dust....just to show me how dry it is
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Old 20 August 2018, 12:45   #6
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My anchor locker drained down the keel so didn't matter
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Old 20 August 2018, 17:00   #7
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my ribquest had land drain pipe the light weight stuff loads of holes in it to drain into the keel drain
personally i would go for land drain pipe as you only want a passage guide to keep it all together ,loads of perforation ,if water cant escape it will poison your boat with a stink ,
perforated pipe is avail in 75 100 annd 125 ,white blue or black i think ,May be able to get 150mm but it does get expensive in bigger sizes , if you go and ask a local farmer he will probhably give u a couple of metres i suspect ,it has ridges in the walls but nothing you wont overcome with a pull cord and insulating tape
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Old 21 August 2018, 01:47   #8
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I have a selection of twinwall pipes to choose from and I was planning to use the 2.5" electrical conduit and add a few holes. I'll be running 2 pipes as per the last boat. One feeds the engine harness, cables and fuel into the engine rigging pipe and the other will feed steering hoses, nav lights, antenna, bilge and sounder. No point in making the engine feed any bigger as the constraint is the hole into the engine and the auxiliary tube was plenty big enough on the old boat. It gives me the equivalent area of a 75mm pipe.

The ends will either be in the console or sealed as best I can to keep water out. Just got to figure out where to drill now.

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Old 21 August 2018, 07:11   #9
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Just had a thought. The destroyer deck is supported by two longitudinal stringers roughly 35cm each side of the center line of the boat. The central hull void is definitely drained but does anybody know if the outer voids also drain into the splash well? I was going to run the cables ducts there rather than pop up in front of the splash well. If the area isn't draining, I'll not drain the cable ducts.

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Old 21 August 2018, 15:50   #10
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Apologies, don't want to hijack your thread but got me thinking...anyone know if Ribcraft fitted trunking with drainage? My Tohatsu wiring when I rewired it last year was wet when I hauled it out. I've had the hull bung out, dry as bone. Over time water has probably entered via the witches hat rubber grommet on the deck. Wonder if I could run a tube into the trunking and pump it out?
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