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-   -   Drain sock (http://www.rib.net/forum/f50/drain-sock-39420.html)

Delta 15 11 January 2011 08:21

Drain sock
 
I'd like to add a couple of drain socks to my Avon but the scuppers are only about 25mm ID. The commercially available socks start at 680mm. Is there a way to DIY or adapt drain socks to fit my boat short of drilling the transom?

Cheers,

Jon

PeterM 11 January 2011 10:16

I guess buy a bit of matching (or not) colour hypalon + glue and make your own ?

Or am I missing the point ?

Delta 15 11 January 2011 10:49

That's what I was wondering. Rib-shop told me the scuppers in the boat are too narrow to allow use of a sock.

I guess I'm not quite clear on how they work. I assumed that they drain water when the boat is underway but close up when the boat stops due to external water pressure?

Does it have to be hypalon or would a piece of PVC? If it's a question of water flowing back in when the boat stops, I can just put the plugs back in when the water has drained.

Cheers

chewy 11 January 2011 10:58

Trunk down = water drain when underway, leave it down when you've stopped and it'll slowly fill back up.
Trunk up = water won't drain but then the trunk won't let water in either, simples.

A 25mm trunk will work but not very well, I'd just bite the bullet and buy the biggest one!

PeterM 11 January 2011 10:59

PVC will work I am sure & any size will drain if given enough time- just be slower for obvious reasons....

I always used to put bungs in if not 'actively' using mine - just stops the small trickle that will eventually fill the boat if left down.

martini 11 January 2011 11:36

Quote:

Originally Posted by Delta 15 (Post 384131)
The commercially available socks start at 680mm.

:eek:
I'm guessing you mean 68mm :)

It would be dead easy to get a core bit and drill your transom out to take a bigger trunk, 25mm is properly small and you'd benefit greatly from a bigger one.

Find a trunk that has an I/D that matches the O/D of a pvc drain pipe, drill transom to suit pipe, sikaflex it in then glue the trunk to the pipe. Seemples :thumbs:

Delta 15 11 January 2011 12:18

Ah, yes -- 68mm indeed!

Thanks for all the feedback - very helpful.

Poly 11 January 2011 12:26

Quote:

Originally Posted by Delta 15 (Post 384142)
Does it have to be hypalon or would a piece of PVC? If it's a question of water flowing back in when the boat stops, I can just put the plugs back in when the water has drained.

:] if you're going to put bungs back in when drained then why bother with trunks? the advantages of trunks are: (a) you can leave them down for shortish periods without worrying about the boat filling up significantly (whereas with bungs the boat will fill as soon as you come off the plane) (b) you can (if you wish) operate them remotely using a long cord. This is especially useful if you are single handed as with bungs you'd probably have to leave the helm to either fit or remove them.

PeterM 11 January 2011 12:35

Quote:

Originally Posted by Polwart (Post 384160)
:] if you're going to put bungs back in when drained then why bother with trunks? the advantages of trunks are: (a) you can leave them down for shortish periods without worrying about the boat filling up significantly (whereas with bungs the boat will fill as soon as you come off the plane) (b) you can (if you wish) operate them remotely using a long cord. This is especially useful if you are single handed as with bungs you'd probably have to leave the helm to either fit or remove them.

I'm thinking he is thinking for periods of more than say 20 mins+ ........ the best trunks in the world will let water in which will be noticed after that time...

Poly 11 January 2011 12:48

Quote:

Originally Posted by PeterM (Post 384162)
I'm thinking he is thinking for periods of more than say 20 mins+ ........ the best trunks in the world will let water in which will be noticed after that time...

Aye but normal practice (IME) is simply to raise a trunk when sitting still for a while - the only time I can imagine adding a bung as a backup would be if leaving it afloat overnight and worried about the trunks failing (e.g. through wear and tare). Moreover with a 1" tube I suspect (unless its made from some very flimsy/vulnerable material) that it will leak more than a 3" trunk - as it won't collapse as flat? Personally I have a 40mm (?) bung which is central (so can't take a trunk as the engine is there) and manage OK. Trunks aren't really an option due to the transom design - so I've added a bilge pump so I have an alternative when alone and unable to leave the helm when the boat is on the plane. I have wondered about the "duckbill" drainers - which might be an option for the OP?


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