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Old 29 December 2009, 10:54   #1
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stress cracks in gelcoat

I bought a new rib in September 2009, I have been out on it once and just found some stress cracks at the back of the transem, each side of the engine. Is this due to the engine being to big ? ( 70 hp on 5.2 meter rib ) or would it be a design fault ?. Advise would be of help.
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Old 29 December 2009, 10:59   #2
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People will need to know more. What type of rib, type of engine and the max permitted engine size/weight

TSM
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Old 29 December 2009, 11:00   #3
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It's not ideal on any RIB, new or otherwise.

If it's still in warranty take it back and get it seen to (assuming you've got the right size engine on the transom).

If you can't do that it's unlikely to be structual so I'd get the cracks filled and keep the water out.

As TSM say's more info or a pic would help.

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Old 29 December 2009, 11:07   #4
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Quote:
Originally Posted by two stroke mick View Post
People will need to know more. What type of rib, type of engine and the max permitted engine size/weight

TSM
The size of the engine 70 hp evinrude RNLI , The boat is suppose to be able to take an engine upto 90hp.

Boat is a Seapro.
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Old 29 December 2009, 13:34   #5
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Here they say its only a 70hp on a 520 sport http://www.seaproboat.co.uk/ribs.php Scroll a bit down to the spec sheet....

They also say at their site they give 3yrs warranty...
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Old 29 December 2009, 15:54   #6
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Should be ok with the ex RNLI 70hp as they are showing the same engine fitted on their site.
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Old 30 December 2009, 03:58   #7
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the way transom's are built you shouldn't get stress crack's on it, i'll explain, stress cracks appear when 1. the gells to thick and 2. the structure the gells on flex's, the way a normal transom is laid up there should be no movement in it, you may find crack's around the edge of a transom but across the face is unusual
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Old 30 December 2009, 04:25   #8
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Does anyone know where they are made?
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Old 30 December 2009, 05:42   #9
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the way transom's are built you shouldn't get stress crack's on it, i'll explain, stress cracks appear when 1. the gells to thick and 2. the structure the gells on flex's, the way a normal transom is laid up there should be no movement in it, you may find crack's around the edge of a transom but across the face is unusual
Hi, the cracks looks like a spiders web on each side of the engine ,i took some pic,s of them but don,t show up very well, i'll take the rib in to the dealer next week and see wot they got to say thanks.
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Old 30 December 2009, 05:48   #10
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Does anyone know where they are made?
I think America
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