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Old 30 March 2008, 16:26   #11
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Originally Posted by Limey Linda View Post
I am concerned about this as I have a squared off bow and thus a lot of area to lift. I have a bow roller mounted on a 2foot wide fibreglass platform on the tubes with a cleat Do you think taking the painter from the bow eye , over the roller to the cleat would do the job?
On the otherhand - you have more glue surface area than many at the bow. Is the fibreglass platform at the front pretty strong - if so will it not stop the tubes being pulled upwards anyway?
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Old 30 March 2008, 17:05   #12
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Originally Posted by Polwart View Post
On the otherhand - you have more glue surface area than many at the bow. Is the fibreglass platform at the front pretty strong - if so will it not stop the tubes being pulled upwards anyway?
Yes, the fibreglass thingy is tough as old boots, 1/4" thick, but as you say it will not stop the tubes moving upwards by itself. If I strap the thingy to the bow eye it should provide a lot of well spread out tube retention.
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Old 30 March 2008, 17:42   #13
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I reckon you should use 2 straps or one shaped like a Y so it goes either side of the bow - on a normal RIB that is.
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Old 30 March 2008, 18:06   #14
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Blow the image up here(link) and here(link)

and you can see the foul weather strops on my boat.
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Old 30 March 2008, 18:27   #15
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Surely the tube and strap or rope would just displace together with the tube in that case? .. and not really give that much protection ?
I haven't got them on my RIB, but I think they are on there to stop things getting too bad when it does decide to go. I guess if they where tight enough they could help reinforce the bow tube.

At the end of the day, if you're concerned about the bow being ripped off, buy a hard nosed RIB like an Osprey or Scorpion.
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Old 30 March 2008, 18:44   #16
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I'd put a fiver on that bow joint being previously damaged by nipping against the relatively sharp fibreglass corner behind it. After all, hypalon is just heavy gauge cloth and if you've ever ripped up a rag you'll know that all it takes is a wee bit of damage to initiate the tear. It's always good to radius corners to relieve stress and even better to give them some protection. It's better still to have a hull design which takes most of the strain rather than rely solely on the tube joint.

It's interesting to see there's a good deal of reinforcement over the bow of the tube but none of it is carried down over that vulnerable front corner. Mistake.
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Old 30 March 2008, 18:58   #17
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Any thoughts on the damage and possible repair options will be gratefully received.
Take the old hypalon off back to a sound area. Heavily radius the hull and redo the joint with at least a couple of hypalon layers. Adapt or modify the bow snubber to continue down and over the hull. If this still leaves the area each side at the bow vulnerable then reinforce this with rubber to absorb the inevitable bruising that area will get. This may have to go back a good distance to protect each side of the bow properly. It's common for that area to be at just the right height to catch along the edge of a pontoon when coming alongside. If you overshoot or the boat takes a surge on a wave and it contacts the end of the pontoon, that'll be the bit which whacks it.
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Old 30 March 2008, 20:01   #18
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Tinker, out of intrest were the tubes inflated until hard or where they soft-ish when it happened?
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Old 31 March 2008, 08:13   #19
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Roy
Forgive my ignorance but what is a 'foul weather strop'?
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Take the good lady wife out for a spin and get her hair wet then you'll see a real foul weather strop
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Old 31 March 2008, 08:42   #20
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Another way to approach this is as follows.... Make up a T peice like the one shown and fit it to the bow as shown, Jwalker's right in that you'll need to radius off any sharp edges on the GRP flange which may come in to contact with the tube, it's also worth noting that damage like this occurs quite often and anyone looking to buy a second hand rib should look out for this kind of damage, i've seen it caused by trailer winch posts as well as crashing in to harbour walls and such like.
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