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Old 28 June 2017, 05:15   #1
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Country: UK - England
Town: Formby
Boat name: Happy Daze
Make: Avon
Length: 3m +
Engine: Yamaha two stroke 25
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Avon Rover 3.4 taking in water.....

Hi everyone, I'm new to the site. Great reading so far, it's going to be many hours of discovery catching up!
But I have an issue for you.
When I'm on the plane there is a flow of water into the rib from the gaps at the corners of the transom as shown in the photos.
I have a Yamaha 25hp two stroke twin fitted, the maximum plated.
Stationary, the rib is watertight, but fills up quickly on the move. I have to bale out a couple of times a day and always arrive back with a few inches of water at the rear.
I can clearly see a flow from the gaps shown in the photo.
I've filled the rib with water and eliminated everything else.
Is this a known fault?
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Old 28 June 2017, 05:55   #2
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Country: UK - England
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Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
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I'm guessing your Avon is as made and there are no bits of material missing? Assuming so Avon can't have expected constant splash in that area so I'd assume it is your outboard causing this. It's a very familiar situation for us Aerotec owners where depending on outboard make/model and load carried/boat trim water hits the front of the OB leg and bounces back towards the transom.

On the Aerotec this is at its worse when the OB leg is too deep in the water and most of us find we need a packer on the transom under the OB saddle to raise it 25mm-30mm.

Your OB is quite heavy for a 3.4m so may be pulling the transom down more than ideal. Also how about the positioning of your fuel tank and any other gear? Plus consider the fore/aft positioning of the console?

It may be that altering the trim of how your boat runs and/or a transom packer could be the answer.

The other thing that comes to mind... could you try getting some material glued in place to cover those holes... or is it coming over the transom top too?
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Old 28 June 2017, 06:37   #3
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Country: UK - England
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Thanks for replying.
I don't really keep anything much at the rear as I have plenty of starage further forward. I've adjusted the trim of the rib for max speed with one person, and I don't think that's an issue
The Rib is within manufacturers plated limit, maybe well inside as this motor is two stroke and quite a compact unit compared to others, particularly four strokes.
The problem really is that there is considerable wash around the exterior transom. This is finding it's way through those gaps at a rate of knots :-)
I have those plastic vane thingies on the leg, which I believe helps with trim at speed.
I've tried stuffing socks into the gaps, but there is flexing and they fall out :-)
A mate had suggested a product to fill the gap but I need to find out if anyone has had this problem and solved it.
I've mailed an Avon distributor, but without much expectation as I believe they have ceased trading? Maybe because of water logged ribs!! :-)
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Old 28 June 2017, 07:00   #4
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>>>there is considerable wash around the exterior transom

In general the Avon's hard hull should produce a cleaner wash than most of our problematic SIBs so you really need to look at what is creating the splash back. Is it possible to take a lightish person out to look/film over the transom or could you borrow a GoPro and set it up to watch the wash?

Otherwise first I'd try a trip without the OB fins to see if that changes things.... then look hard at the prop/cav plate position relative to the lowest point of the hull to see if there is scope for raising the OB.

I've noticed two different transom shapes on the 3.4 Rovers... one level across the top and the other with a fair rise to where the OB mounts. I wonder which yours is and is the OB the correct shaft length for certain?
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Old 28 June 2017, 10:04   #5
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Country: UK - England
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Thanks, gonna work on what you've said and get back to you.
If I could only seal those gaps though, I'm sure that would solve it
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Old 28 June 2017, 10:11   #6
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second picture is that the bottom of the engine clamp 2/3rds down
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Old 28 June 2017, 11:03   #7
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we have a rover 3.40 and from memory i('m not near it now) its the same round the transom, dont recall having water come through the gap so suggest it may be the trim on the motor is your a power trim?
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Old 28 June 2017, 13:10   #8
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Country: UK - England
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Not power trim, but easy enought to adjust. I have it set perfectly for an easy and not too high at the front plane and max speed (24mph)
I'm going to try taking the wings off and looking at raising the OB.
But I think filling those two gaps is going to be crucial. A friend has suggested using polymorph. I thought make the plugs with that and then sikaflex in place?
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Old 28 June 2017, 13:47   #9
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Country: UK - England
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Quote:
Originally Posted by Fenlander View Post
>>>there is considerable wash around the exterior transom

In general the Avon's hard hull should produce a cleaner wash than most of our problematic SIBs so you really need to look at what is creating the splash back. Is it possible to take a lightish person out to look/film over the transom or could you borrow a GoPro and set it up to watch the wash?

Otherwise first I'd try a trip without the OB fins to see if that changes things.... then look hard at the prop/cav plate position relative to the lowest point of the hull to see if there is scope for raising the OB.

I've noticed two different transom shapes on the 3.4 Rovers... one level across the top and the other with a fair rise to where the OB mounts. I wonder which yours is and is the OB the correct shaft length for certain?


Theres a raised section on this transom, I can't really lift the outboard anymore I don't think...Click image for larger version

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Old 28 June 2017, 13:48   #10
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Country: UK - England
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Posts: 37
Wish I had cleaned it all before all these photos..... :-)
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