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Old 12 July 2006, 06:32   #21
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I don't know if it is feasable or recommended. But my Narwhal's hull is filled with pressure-compacted closed cell polyurethane foaming, which makes it unsinkable even if the hull is broken. (NB this wasn't retro fit it is as standard). Would it be feasible to retro fit this?

They have received certification of an unsinkable boat (whatever that is!)
http://www.narwhal.es/narwhal.php?pa...es&idnoticia=2

I once saw a demo for a dory where they chainsawed it in half and paddled away the two halves due to the inherent bouyancy - I guess this would do something similar.

Just a thought.

Mike
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Old 12 July 2006, 10:04   #22
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Quote:
Originally Posted by Mike B
I don't know if it is feasable or recommended. But my Narwhal's hull is filled with pressure-compacted closed cell polyurethane foaming, which makes it unsinkable even if the hull is broken. (NB this wasn't retro fit it is as standard). Would it be feasible to retro fit this?

They have received certification of an unsinkable boat (whatever that is!)
http://www.narwhal.es/narwhal.php?pa...es&idnoticia=2

I once saw a demo for a dory where they chainsawed it in half and paddled away the two halves due to the inherent bouyancy - I guess this would do something similar.

Just a thought.

Mike
It's a good thought!

It would certainly solve the problem if leaks were an ongoing irritation.

The most likely difficulty I can see is making sure that the foam gets into all the crevices of the hull void. Anyone know whether the internal structural members in a Valiant hull have holes in the neutral axis?

One other issue: Would the hull start to squeak as it flexed in a sea? I don't want a squeaky rib!

Jim
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Old 12 July 2006, 10:12   #23
J S
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Mike B I saw this as well I think it was boston whaler
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Old 12 July 2006, 10:27   #24
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Quote:
Originally Posted by jgrace

One other issue: Would the hull start to squeak as it flexed in a sea? I don't want a squeaky rib!
Jim

Never thought of that! - Mine doesn't squeek but if there are voids then I suppose it is potential - I don't think your likely to hear anything above the wind / engine / water at sea - though I guess it would be possible when walking on the deck at rest.

Mike
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Old 12 July 2006, 15:17   #25
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years ago we filled a load of club kayaks with that foam in each end . after a while it absorbed water and they were as heavy as hell . Not sure if there is some better stuff about now but the foam in a can you get in the builders merchant has the same problems .

I filled the inside of my boat with about 4 inches of water tis morning. It only filled the stern area as its on my sloping drive . Took the bung out this evening and about a egg cup full came out , so some is getting in around the deck drain . Maybe its the outside of it leaking more. So out with the deck drain fitting and re seal then try again .

Other than the bolts that hold the engine on I can't see anything else there to leak .
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Old 12 July 2006, 16:19   #26
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Quote:
Originally Posted by ian parkes
I filled the inside of my boat with about 4 inches of water tis morning. It only filled the stern area as its on my sloping drive . Took the bung out this evening and about a egg cup full came out , so some is getting in around the deck drain . Maybe its the outside of it leaking more. So out with the deck drain fitting and re seal then try again .
Ian, when you say you filled "the inside of your boat" do you mean the deck or the hull void underneath? I think you mean the deck, but if so, then an eggcup-full is practically nothing. If I had 4" of water permanently standing on the deck and two or three eggcup-fulls got down into the hull every 24 hours, I wouldn't have a problem.

Jim
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Old 12 July 2006, 17:32   #27
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Yes filled the deck area with the boat facing stern downhill as if on a slipway .
What I was getting at was that if a little water was getting through the deck drain fitting from the inside then its not sealed and a lot of it could be entering from the outside when the boat is afloat .
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Old 12 July 2006, 17:33   #28
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Send a message via Yahoo to Daniel TD5
valiant 490

has it got a front anchor locker if so it leaking from that all later 2002/2003
have solas sealed hulls which don,t leak the front anchor lockers are open to allow water in to the hull

solas appoved hull design

all early anchor lockers were part of the formed deck at all leak new designs
were a fixed box type which sorted the problem

dan
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Old 12 July 2006, 18:15   #29
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Yes it is the type with the anchor locker as part of the hull but the water isn't getting in there as its never had enough water on deck to fill up . I have filled the anchor locker and it holds water ok .

As for a sealed hull there can be no such thing surely , it has to breath or it would swell up in the sun and implode in the cold .

I won't be happy untill i have a pump fitted , what if the hull is damaged while at sea , the more I think about it the more I want a pump , its just a question of how to do it .
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Old 12 July 2006, 18:50   #30
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Quote:
Originally Posted by Daniel TD5
has it got a front anchor locker if so it leaking from that all later 2002/2003
have solas sealed hulls which don,t leak the front anchor lockers are open to allow water in to the hull

solas appoved hull design

all early anchor lockers were part of the formed deck at all leak new designs
were a fixed box type which sorted the problem

dan
My front locker's always got water in it, but that doesn't mean it's not where water gets into the hull. Must take a look.

Jim
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