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Old 31 March 2005, 15:29   #21
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Country: Sweden
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Boat name: Osprey & Ring
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Have you tried putting extra weight on bow before you adjust engine height this will help
The console are pretty far front so that should`nt be the problem, ok that twin 4-stroke 115hp has plenty of weight but still boat is not overpowered so it need any ballast in bow compare to the fitting of console and seating (only my opinion of what i se of pics)
Offcourse ballast in bow will help to get the wobbeling away but than the boat will be heavier in bow wich will get more wet surface and and not pleasant to drive as it should be in the ruff seas and it will also make the fuleconsumption higher on flat water.
It`s nice to have heavy boat in bow in ruff seas but it is still important to have the possibility to trim up the bow in ruff seas and this will disapere with to much weight in bow.
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Old 31 March 2005, 15:32   #22
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I think your boat was owned by a chap who did a lot of powerboat race safety. Therefore he would always have divers on board and all the weight that goes with that. It may be that the boat needs a bit more weight.

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Old 31 March 2005, 15:49   #23
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Therefore he would always have divers on board and all the weight that goes with that. It may be that the boat needs a bit more weight.
Dont really agree, you can have a light boat that is over powered without any wobbeling, most of the wobbeling depends how boat is balanced compare to the outfitting and engines.
Boat looks little heavy in back but not so heavy that it should start to wobbel at 40 knots.
Another idea is the props, do you know how many revs you have at full throttle, maybe you need some other props to get better grip, it will effect the topspeed a little but a more pleasant ride without compensating the wobbeling all the time.
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Old 31 March 2005, 15:49   #24
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I believe the boat is an ex life boat...

Is anyone up for coming out with me at some point to see how it handles ... like I say, im new to ribs... and its a totally different experience for me...

However, I am loving it and will never look back at any other boats again!

Would just be nice for others to tell me what I should be expecting and things.
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Old 31 March 2005, 15:53   #25
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not sure how many revs it has - will look at rev counter next time im out...

Also, the steering has slight play in it, I assumed that that might be right so that when you bounce from the water you dont come down with the steering in a different place... should the engines move immediately the wheel is turned?

Its only about 1cm the movement I have..
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Old 31 March 2005, 15:53   #26
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PS: Benc you say that 75 % is 40 knots, this means that boat can do around 50knots, sounds very fast for that boat, i would guess 45knots, i can be totaly wrong
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Old 31 March 2005, 15:56   #27
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1cm if you talk in steering wheel is nothing, do you have twin steerings with a bar between or just one steering and a bar that is fitted to one of the engines.
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Old 31 March 2005, 16:02   #28
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Looked at the other pics and can se that you have single steering with a bar between engine, its ok as long as it`s hydraulic on thoose heavy engines.
I would recomend double steerings but it shouldnt be the problem in your case.
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Old 31 March 2005, 16:25   #29
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As I have said: Ring Laurence Lock @ Barnet marine (www.ribs.co.uk) and ask him. He built it! (almost!). He is a very helpful guy and he has owned many 7.5owm himself ... as well as sold many hundreds of Tornados.

Certainly at 50 mph, my 6.8m Tornado can chine walk if my trim is high, and so a trim is down a little and it stops. It does sound odd you experience this at the speeds you say on a larger boat. I would have expected it to be rock steady.

Just one question ... have you checked your hull cavity is dry?
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Old 31 March 2005, 16:28   #30
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Any play between wheel and outboard/s might promote chine walking, how much are the engines moving relitive to the wheel and do they move relitive to one another?

Do a search for chine walking and you'll see what problems others have been having and what their solutions were. It could be something as simple as air in the hydrualic system.

Also, and excuse me....But!! I don't see the point of moving the weight up front to increase the wetted area under the hull to get over the problem of chine walking unless you're already fully trimmed in and still get it? I mean, if by increasing the weight up front to effectivley increase the surface area in contact with the water, isn't that going to slow your top speed? Its the same as trimming in isn't it? And by having a lesser weight up front you would have an advantage in a following sea.

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