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The Norfolk Broads Forum / Projects / Advice on repairing crack in Hull?
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Posted By Discussion Topic: Advice on repairing crack in Hull?

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lawesdas
May-14-2017 @ 11:36 AM                           Permalink
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Hi All,

I have just bought a Pegasus Prelude...

When I got her home I noticed a crack in the hull about 6 inches long (picture below) - it isn't through to the inside on the hull, I probably should of paid more attention when viewing. How should I go about fixing this? I think the cause of this is from the hull being pushed in a bit which I put down to it being sat badly on the trailer or is there a bigger problem here?


.


Thanks




This message was edited by lawesdas on May-14-17 @ 12:40 PM

johnm
May-14-2017 @ 12:16 PM                           Permalink
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Is it just the one crack or are there cracks either side of the trailer pad?

It looks to me as if the edges of the cracked GRP have paint on then which indicates that the crack in the first pic was already there. What did your surveyor have to say about the state of the hull and this area in particular?

It may be compression damage from the trailer during transport or it may be that it is an osmosis blister that has given way under compression from being loaded onto the trailer. I would recommend getting a boatbuilder to have a look and advise.

If, as it looks, the crack has been there a while, you are going to have to grind out the de-laminated area (which may extend some distance depending on the cause), then clean and dry it before re-glassing the area. Doable if you have experience with working with GRP or probably better done by a professional given that it is below the waterline and near a skin fitting - the last thing you want is for the hull to give way in that area.

John

BITTERN 35

rustic
May-14-2017 @ 1:54 PM                           Permalink
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Over the years we have trailed our own Viking cruiser, not the thickest of hulls but certainly fit for purpose. However, when trailing it is essential to spread the load over a large area, and the pads on your trailer might be adequate for say steadying a boat whist on a hard standing, to paint etc, but in my opinion, they are far too small if used on road borne transport, even for a short distance.
I would be worried just recovering it from a slipway with small pads.

I would expect there will be similar but maybe unseen as yet, damage at other locations in similar places, and it would need a thorough investigation.

I would expect that it would be easily repairable, but even transporting it with the currrent pads should be a no no, and better support needs to be in place before further transport, in my opinion. I am not a boat structural engineer.

I suspect from your comments that you didn't get professional survey prior to purchase. I guess each buyer has a financial threshold at which if the boat value is below a certain value, a survey is often ignored, and taking a chance becomes more favourable. Maybe this time...  oops.
Often taking a third party with you to look at other details like this may have helped, rose coloured spectacles and all that.

Have you been in touch with the seller, was it " bought as seen " ?

It does need sorting, delamination will only get worse.





best regards, Richard.

In my opinion, being on a boat is one of the most relaxing place to be.

lawesdas
May-15-2017 @ 9:25 AM                           Permalink
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Thanks for your replies, and no I didn't get a survey done - for a £1000 boat that's 40 years old it didn't seem worth the survey fee, maybe not an intelligent decision.

The crack is only on one side of the support and is where the weight has been sitting - the boat isn't on the trailer very well the keel has missed the support plank and this has caused un-even weight distribution across the supports.

I lifted the weight off the support with the crack under it yesterday and the hull bounced back to it's original shape.

There doesn't appear to be too much osmosis - I can't see any blisters around the hull, although it's been out of the water for a year so may of dried out although I'm sure we get enough rain to reduce this!

I'll look into getting some larger pads and maybe adding a couple more to the trailer.

pargeandmarge
May-15-2017 @ 5:31 PM                           Permalink
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Hi lawesdas
I've trailed a few boats about and in my opinion the trailer isn't adjusted properly.
All the weight of the boat should be on the keel in this case and the pads at the sides only used as stabilisers. Could have done with more pics but I think that there is a roller at the front doing nothing it should be raised if it adjusts or chocked up to take the keel weight as you have a ratchet strap pulling the boat down onto the pad of the stabiliser. The ratchet strap is positioned in front of the stabiliser and when tightened will just pull the boat into it.
Regards
Marge and Parge
P.S if the boat is to live on this trailer it will be fine but must be adjusted correctly.

Harlequin
May-18-2017 @ 4:17 AM                           Permalink
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Yes sort the trailer...
However on the face of it the damage is not too serious. Get someone experienced with GRP to look at it to check and repair. My guess is that it will be easily sorted.

Teadaemon
Jun-17-2017 @ 12:34 AM                           Permalink
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Well as a now ex surveyor (still a BSS examiner, at least for this year), I can't say I'm surprised you decided to take a chance on a £1,000 boat, since my fee (and I was pretty cheap) would have been about 20% of the cost of the boat.

This looks interesting.

I agree that at first glance it looks like an improperly positioned pad has caused this crack. Then I noticed that the edges of the crack are the same colour as the antifouling on the hull. That suggests to me that the crack has been there since the boat was last antifouled. I'm also a little intrigued that it doesn't extend all of the way through, as I believe that the Prelude hull, like the Pirate I used to own, has a solid GRP hull rather than one with a core. I would not expect solid GRP to fail in this way. (I'd expect that if it did crack like this, that the crack would extend all of the way through the laminate.)

I would suggest that after sorting out the pads on the trailer so that all of the weight of the boat is being supported on the keel, some investigation of the crack and the area around it is in order. I'm really not sure what you'll find, but it'll be interesting to find out.

Brendan Burrill Dip Comp. DipMarSur (YS)

Burrill Marine Services surveys, consultancy, project management, BSS Examinations

ElysianCraft
Jul-13-2017 @ 1:09 PM                           Permalink
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I am going to state the obvoius, but are you sure that is not just 30+ years of thick antifouling peeling away from the hull??????? You might be very lucky if thats all it is?

Safe & Sound


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