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Old 15 July 2005, 07:26   #11
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The top of the transom......

......has been cut down, capped and flowcoated, the flowcoat is basically gel-coat mixed with wax in Styrene to give a 'flowed' non-sticky surface.
What i find suprising is that the Gelcoat has a certain amount of flexibility in it which should be able to withstand this application.
Further investigation required i think.
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Old 15 July 2005, 07:39   #12
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Quote:
Originally Posted by Matthew MacLean
Thanks ... To the last 3 posters, if you really want to display your extensive knowledge...
Matthew
One's a boat builder by trade, the other builds boats for "fun", both have more knowledge about these things than most of the rest of this board put together...
You'll find that their comments were given to indicate that some of the other comments by the "less well qualified" should be taken with a pinch of salt... take heed of their input and you won't go far wrong....

...and the other one of the last three posters?...
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Old 15 July 2005, 07:56   #13
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Quote:
Originally Posted by Cookee
don't think so! You a boat builder now as well?
Why don't you READ what I said!!! I was only commenting on what others had said on this forum in the past!!!

Whilst I may not be a boat builder I DO have a very good knowledge of engineering in general - know all about the spreading of stress cracks etc etc.

Fibreglass is a lot more brittle than plywood - it stands to reason the cracks could easily be just on the surface - as Rich says though cracks such as these can lead to water getting into the laminate causing all sorts of problems.
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Old 15 July 2005, 07:58   #14
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Quote:
Originally Posted by Matthew MacLean
To the last 3 posters, if you really want to display your extensive knowledge, suggest a but of detailed discussion about what can cause this/ advice on the problem, cause you really are not covering yourself with glory here.
Matthew, you're asking for help, don't get shirty.

It's impossible to tell why your transom is cracking, but it shouldn't be cracking. The remedy is obvious, take it back to the supplier.

What makes you think we want to display our extensive knowledge?
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Old 15 July 2005, 08:00   #15
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Quote:
Originally Posted by codprawn
Fibreglass is a lot more brittle than plywood - it stands to reason the cracks could easily be just on the surface ...
Pish.

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Old 15 July 2005, 08:09   #16
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Originally Posted by jwalker
Pish.


Very technical answer - so you are telling me that the plywood transom is also going to have cracked in the same place??? Through all of those plies???
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Old 15 July 2005, 10:37   #17
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STOP.


My Granny used to say " if you don't know what you are talking about shutup"
Ribraff why if the transom was cut and flowcoated did they bother to finish the top and not the rear face?

Codders with your prolific knowledge of stress how have you not noted the direction and location of the evident cracking as a clue to the cause?

I was going to ignore this thread when Cookee told me, as I was too busy making splitpoint drills with an anglegrinder (JW I concure they are the tool for all seasons). But now I will add my twopennuth.

In my humble opinion the transom is split on the interface between the moulded top return and what ever the builder has used as a filler/adhesive.
As the transom has bowed it has created tensile loading on this joint which has failed to some degree resulting in the visible damage.
This is possibly due to the over use of some form of bonding paste or air voids in behind. At the end of the day, no one can say for sure from a photo, and the only way I know of examining a build thoroughly is destructive.
Give the builder first chance to sort it but if it reoccurs (I'd take odds) then get it to a third party for a report.
At the end of the day Im sure that I may be spouting just as much rubbish as the rest of them as I only have a fuzzy photo and 20+ years expirience to base this on.
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Old 18 July 2005, 06:23   #18
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As you say...

...we are dealing with fuzzy photo's here so it's all speculation at this point, it is my (humble) belief that a cut out was made in the transom for a particular engine shaft length, this of course will also cut down the deck liner, it has then been finished off with a capping of fibreglass, taped up and flowcoated. I don't think there is any need for your Grandma's quotes.

Let's try and be nice
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Old 18 July 2005, 07:48   #19
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Rib Raff
tried to pm you, but your box is full.
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Old 18 July 2005, 08:07   #20
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Yes....

......empty now.
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