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m_liddell View Drop Down
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    Posted: 23 Aug 05 at 7:16pm
Thanks for the advice guys. I've got someone who knows what they are doing to repair it with carbon. Hope fully I'll get out sailing this weekend. I think I'll be a bit more careful with the tension on the uppers from now on though...
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Chris Noble View Drop Down
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best idea for us to go on here is to post some photos before we can go any further
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Ginger_69 View Drop Down
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ok maby it was a bad idea
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 8:47pm
Originally posted by Skiffe


DO NOT put aluminium with carbon. It causes a "battery" effect that eats at the carbon until there is no carbon left.

Other way round actually mate, but yes its a really bad idea. If one is really silly one puts an alloy sleeve inside a carbon spar, the alloy goes fizz, fizz and corrodes, the corrosion expands, the resin in the carbon tube microcracks, the fibres aren't supported and down your early model RS600 mast comes...
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Skiffe View Drop Down
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Posts: 220 		Post Options Post Options   Quote Skiffe Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 4:43pm
Originally posted by m_liddell

Originally posted by JimC

You need to tell us what fittings and so on the cracks are near and in what relationship to them, and what orientation they are. A photo (you'll need to get photoshop out to highlight the cracks 'cos they don't photograph well) would be ideal.

But yes, its very repairable and the mast will last indefinitely if well repaired. Normally the options are to add extra carbon sternegth across the cracks or just to sleeve the pole, eother inside or outside.

I'll try and get some pics this weekend. I have some carbon to put around it but I was wondering if drilling holes at the crack tips would help to stop them propagating further?

I'm pretty sure the fittings are not the cause since the cracks are identical both sides and away from any fittings.

Drilling holes will not stop carbon cracking, like metal. If they are identical in length and position on the mast, compression could be a good guess. was the mast Pro built or made in a backyard, yes it can be done!!
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Skiffe View Drop Down
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Posts: 220 		Post Options Post Options   Quote Skiffe Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 4:37pm

Originally posted by Ginger_69

well you could wrap the bottom of the mast in carbon to strengthen it that would prob work or you could rivet a piece of alum all round the mast were the cracks are.

DO NOT put aluminium with carbon. It causes a "battery" effect that eats at the carbon until there is no carbon left.

Depending on the cracks, including location on the mast and more importantly what caused them (fittings, compression, fatigue, UV etc.) it can be Very easy repair which will be just as strong as the original mast. Normally 2-3 layers of carbon unis and 2-4 layers of bi-directional cloth should do it, but lets see your pics first.
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m_liddell View Drop Down
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Posts: 583 		Post Options Post Options   Quote m_liddell Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 3:31pm

Originally posted by JimC

You need to tell us what fittings and so on the cracks are near and in what relationship to them, and what orientation they are. A photo (you'll need to get photoshop out to highlight the cracks 'cos they don't photograph well) would be ideal.

But yes, its very repairable and the mast will last indefinitely if well repaired. Normally the options are to add extra carbon sternegth across the cracks or just to sleeve the pole, eother inside or outside.

I'll try and get some pics this weekend. I have some carbon to put around it but I was wondering if drilling holes at the crack tips would help to stop them propagating further?

I'm pretty sure the fittings are not the cause since the cracks are identical both sides and away from any fittings.
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Ginger_69 View Drop Down
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Posts: 481 		Post Options Post Options   Quote Ginger_69 Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 2:32pm
well you could wrap the bottom of the mast in carbon to strenghten it that would prob work or you could rivet a pice of alu all round the mast were the cracks are.
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lightning-168
Whaam (cherub)
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Will be arup skiff crew aka marmite
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guytoon View Drop Down
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Posts: 82 		Post Options Post Options   Quote guytoon Quote  Post ReplyReply Direct Link To This Post Posted: 12 Aug 05 at 9:10am

It's probably easily fixable but I would recommend you not tu use it before fixing it !!!

I let a little crack on a mast last year and it didn't last really long

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Scooby_simon View Drop Down
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Posts: 2415 		Post Options Post Options   Quote Scooby_simon Quote  Post ReplyReply Direct Link To This Post Posted: 11 Aug 05 at 11:18pm
Originally posted by m_liddell

I've just noticed 2 3" long cracks about 3ft from the base of the mast on my I14. Each is in the same place on opposite sides. The boat isn't insured (can't afford it) any ideas how to fix this and how long the mast is likley to last? It's carbon. I really don't have £1600 to replace it!

Any help would be awesome.

 

Your boat is not insured, but I assume you have 3rd Party cover or you could be in mega trouble if you cause an accident and you are found liable. 
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