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Old 15 August 2009, 10:29   #21
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Yes I see what you mean .. if somone physically lifts one of the engine legs up whilst trimmed up, or pushes down on it, can you see any actual movement at the bonding gap ?
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Old 15 August 2009, 10:44   #22
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I'll try that out first thing tommorrow. I didn't notice any movement while tilting the engines up/down using the motor.
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Old 16 August 2009, 18:09   #23
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Quote:
Originally Posted by mhb100 View Post
Guys,

Looks like the issue with the zodiac transom might not be what it appears.


The failing transom....Good news.

After investigation today I now know there is no damage to the structural part of the transom. The spliting is not on the main transom but where the top and hull moulds join together. The split runs parallel to this seam - there is no splitting elsewhere, and having moved the engine today and checked all bolt holes,etc im pretty sure of that.

Having done a postmortum on the cracks (with a grinder) its clear to see whats gone on. On top of the solid transom (where the lip is) is actually a hollow box section (yes hollow,what a design!) the top is about 3-4mm thick the rear about 20mm and the front (where the cracks appeared) about 5mm. In between all this is a hollow core section running the length of the transom. The join where the cracks appeared seem to have the least silkaflex or similar bonding the join. Remedy seems to be to fill with epoxy and finish in gel coat. If the crack had been anywhere else then the outcome would have been very different! . I will look at a transom plate as well.


M


An uncannily similar crack in another boat here's the thread: http://rib.net/forum/showthread.php?t=20131
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Old 16 August 2009, 18:23   #24
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Ok so the transom design in the medline 3 appears to be as follows:

The splashwell top that you can see in the pictures, is also the top of the Aft Locker. Inside the Aft Locker which extends all the way to the transom itself, one can see two knees that support the transom.

Hence, the transom itself is seperate from the lip that has seperated. Will post some pictures of the interior tomorrow.
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Old 17 August 2009, 16:24   #25
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Here are some pictures taken this evening from inside the Aft Locker. Was a bit fiddly getting the camera in there so the angles are not the best.
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Old 17 August 2009, 16:25   #26
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You can see the two knees on either side of the bilge for additional support to the transom. The grey/orange top is the splashwell as seen from inside the aft locker.

The lower mounting bolts of the engine are also visible here.
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Old 17 August 2009, 16:31   #27
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and incidentally there's absolutely no movement whatsoever on the crack while lowering and raising both engines individually or simultaneously
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Old 17 August 2009, 16:31   #28
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SO the transom is fine and it's just where the moulding of the locker sits on top?
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Old 17 August 2009, 16:33   #29
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That's the way it appears to me..what do you think? does the design make sense?
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Old 17 August 2009, 16:34   #30
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Quote:
Originally Posted by jsp View Post
who lit the fuse on your tampon this morning?
lol
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