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Old 18 September 2008, 12:50   #1
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Sinkin Feeling

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 ?
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Old 18 September 2008, 12:58   #2
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I think saw that at Calshot a few weeks back?


Do you have a lot of water in the hull? Is it coming over the transom when she's head to wind at anchor?
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Old 18 September 2008, 13:44   #3
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Quote:
I think saw that at Calshot a few weeks back?


Do you have a lot of water in the hull? Is it coming over the transom when she's head to wind at anchor?
Hiya,

The stern does not seem to have much lift to it. As Tiffy said protrusion of the rear Sponsons dosnt seem as good as on the new 4 meter humber Venturer Three that just entered servcie.

and yes, water Is coming in over the transom
Photos Below, 1) Humber 6.3 Ocean Pro, 2 + 3 New Venturer Three, Tubes seem to extend further compared to the larger RIB?
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Old 18 September 2008, 13:48   #4
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sinkin feeling

Below deck is dry . Water slops over the transom which is only a few inches
below water level when at anchor. Does not come over the bow ; but as
it pitches the stern goes below sea level. We also only have a 80HP engine
and the design is supposed to take much large and heavier engines.
Talking to Humber today , they suggested we should have fitted
a extra long shaft giving 5 more inches transom height . I am surprised
they did not mention this when we special ordered the Rib , if they know it
can be a problem.That perhaps all their larger Ribs should be supplied
with a extra long shaft transom . We also had a problem with the
under fuel fuel tank. The main depth was to the stern , and the filler
cap in the bow. Afloat you could not fill it full . and on the trailer
at a tilt and you then opened the front filler cap all the fuel shot out in
you face. We rectified this problem by turning the fuel tank gauge tube
into the filler , and reverting to eyeball calibrated dip stick. They also
suggested we fit a electric bilge pump with a second battery . Although
with the amount of water it takes this battery would not last long.
I noted at the Southampton Boat Show , many Ribs had self bailing
shields on the stern . Which is the way we might have to go at our cost.
Thanks for getting in touch ; and I would be interested in any other
makes of Ribs have this problem . Although they may never sit at
anchor most of the day.
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Old 18 September 2008, 14:10   #5
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An XL would put the prop 5'' deeper in the water, it wouldn't raise the motor on the transom.
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Old 18 September 2008, 14:21   #6
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I had a 5.8 hull with this problem (Northcraft), at anchor wasnt so bad when it went nose to wind,but some water still spilled in,.. but drifting could not be done, as too much entered over the dropped area where the motor was mounted. The motor was the max HP for that hull, although it was a 2 stroke, the sponsons were not big/long enough to give enough flotation, and also, I only had a single Jockey lineup in the middle of the boat, so there wasnt enough bow weight, to balance the load on the transom. In the end the transom was raised and the motor with it by a couple of inches IIRC to cure the problem, it was easily achieved and there was enough space on the motor mounting plate to raise it, also, the installer had set it too deep to start with which meant no real loss in performance was noted after the mod was done
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Old 18 September 2008, 14:37   #7
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Quote:
Originally Posted by Dirk Diggler View Post
An XL would put the prop 5'' deeper in the water, it wouldn't raise the motor on the transom.
Rubbish, you know what he meant

Tiffy, did you buy the hull and engine separately by chance? Why didn't you tell them what it was to be used for or even ask for advice here on Ribnet. You only had to put a post up asking for advice, its free and you get really good advice from folk that don't have a financial interest in flogging you something.

You asked which other ribs do it, one is the Deltas but they have a GRP and hyperlon skirt inside the transom to keep the slop out of the boat.

Pete
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Old 18 September 2008, 14:38   #8
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Quote:
Originally Posted by Dirk Diggler View Post
An XL would put the prop 5'' deeper in the water, it wouldn't raise the motor on the transom.
I thought the transom was built up higher also on humbers so you can have a high transom but have to fit an XL Engine.?

James
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Old 18 September 2008, 14:59   #9
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Quote:
Originally Posted by Dirk Diggler View Post
An XL would put the prop 5'' deeper in the water, it wouldn't raise the motor on the transom.
I think you may have your fact wrong there, An XL will lift your engine 5" and would of cured the problem.
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Old 18 September 2008, 15:14   #10
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Originally Posted by Ian Sharlot View Post
I think you may have your fact wrong there, An XL will lift your engine 5" and would of cured the problem.
How? The only thing that will stop water coming in is to have the top of the transom itself higher out of the water!!!
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