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Old 18 September 2008, 15:15   #11
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Quote:
Originally Posted by codprawn View Post
How? The only thing that will stop water coming in is to have the top of the transom itself higher out of the water!!!
Doh, which would be achieved with an XL engine and a bit of 4 x 2"

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Old 18 September 2008, 15:25   #12
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Quote:
Originally Posted by Tiffy View Post
We have a New 6.3 meter Humber Rib with a 80 HP Long Shaft Yamaha.

When anchored water slops over the stern and fills the Rib. We feel there
is not enough buoyancy in the hull , or rear tube protrusion lift.

Has anybody else had this problem with Humber or any other makes.

Is there any solution to this problem ?
Is it possible to fit a couple of pieces of stainless plate on each side of the engine to fill the gap where the water is coming over?
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Old 18 September 2008, 15:30   #13
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Quote:
Originally Posted by Tiffy View Post
Water slops over the transom which is only a few inches below water level when at anchor.
Yowsers... You're transom is actually UNDER the water, at rest??? Is this a new boat? Has it always done this? If so, I think I would be raising H*ll with the dealer and manufacturer. The whole "point" of a boat, is to form a hole in the water where you keep your stuff...

The transom on my Hurricane is only about 4" above water at rest, but it's very buoyant and water never comes over (even with my shiny new 4-stroke) it unless I am backing up into a sea. There is also a bit of decking right there which covers a wet-bilge. The area on top of this decking is self draining.

Seriously though, this is a completely unacceptable situation and the manufacturer and dealer must figure out why it's happening. Failing that, I'd be placing a call to my lawyer...
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Old 18 September 2008, 15:32   #14
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Quote:
Originally Posted by Ian Sharlot View Post
Is it possible to fit a couple of pieces of stainless plate on each side of the engine to fill the gap where the water is coming over?
Undoubtedly, this could be done, but he shouldn't have to do anything! His nice new boat is sinking... If it wasn't a RIB, it would sink at the mooring... literally!

As I typed this, I recall a friend who had a small rib years ago... 4m or so. The dealer supplied a regular shaft engine by mistake, where a long shaft was required. Of course it cavitated like crazy, so the dealer's solution was to cut the transom down by several inches, leaving only an inch or two of freeboard. Even at that, water still didn't come in over the top, unless he reversed, but the scuppers and bilge bump could manage that.

Is there any chance that something like this could have happened?
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Old 18 September 2008, 16:17   #15
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The higher transom using an XL engine means the prop is at the same place as normal length shafts but the power head is 5" higher. The whole transom is 5" higher out the water to take account of this.
I am surprised that the transom is slopping water over at anchor, to be expected to some extent when reversing but not stationary.
I ordered the XL transom on mine having used the same hull with the standard and it is now very dry but obviously its a bit late for that solution for you now.
This is a pic of our boat with the XL transom, as you can see there is a fair amount of freeboard and the motor is a very heavy Suzuki at 185kgs so its no lightweight hanging off the stern. The motor notch if it was 5" lower would be very close to the water so I reckon even long shafts are too short for comfort on these hulls
What are Humber saying about it?
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Old 18 September 2008, 18:31   #16
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Any chance of a photo of this boat at rest? Our 6.3 OP has a 150 Suzi XL -about 220Kg- on the back, and the only water we've had to pump out has been rain (not that we get a lot of that up here... ) Then again, Cowal has 2x forward mounted 72L tanks and a 6 man liferaft at the pointy end, as well as the higher transom (but the notch for the engine is, I think, at roughly the same height as a standard transom - the higher parts are really only to deflect following seas. [An expert will be along shortly to correct this ]).

And are you really, totally, absolutely sure there's no extraneous liquid inside the hull? "Mingulay" comes to mind...
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Old 19 September 2008, 03:21   #17
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 19 September 2008, 14:17   #18
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Sinkin feeling

We are going to fit a Yamaha 115 with a extra long shaft , and BHG
our local Avon and Yamaha Dealer is going to raise the transom . Hope Will
be back on service 27th September. In reply to another Posting the
Rib was specially built by Humber who knew we were going to use
it as a Training and Rescue Rib. They also knew we were going to
fit a 80 HP Yamaha 4 stroke , which is less that the maximum rated
HP. Rather surprised at this late date Humber have suggested a
extra Long Shaft . What I am wondering does only Humber's suffer
from this problem , and why do some Ribs not suffer from water
slopping over the transom .Do they have larger tubes and greater rear protusion
and more buoyancy in their hulls ?

I am rather to the conclusion from a safety point of view all
Ribs with the larger heavier 4 stroke engines should have self bailing
wells . Some of which I saw at the Southampton Boat Show.
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Old 19 September 2008, 14:24   #19
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Its all down to design - check out the transom on the RNLI boats. They dont have one , but do have water running in , but are designed that way. Its very odd that your is so low, is there anything else that pulls the back down ? Your tubes must be virtually under water at the stern which is just not right. To pull that much bouyancy down must take a huge weight of something !
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Old 19 September 2008, 15:02   #20
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Quote:
Originally Posted by Blackroady View Post
Its all down to design - check out the transom on the RNLI boats. They dont have one , but do have water running in , but are designed that way. Its very odd that your is so low, is there anything else that pulls the back down ? Your tubes must be virtually under water at the stern which is just not right. To pull that much bouyancy down must take a huge weight of something !
I'm thinking the same thing. "Something is very wrong with this picture."

Honestly, before spending money I would take a picture of the boat from the rear while its in the water. Post it here so we can see what's going on and maybe offer more tailored help resolving it.
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