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Old 26 October 2014, 14:56   #1
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Cobra ribs

Hi,
Can anyone give me any advice on the possible purchase of a second hand Cobra rib 755 or the 8m? I've read about the Padstow accident/ reports and would like to know if the Cobras are any different to any other powerful ribs of that size regarding hooking on really tight turns with the power on? I've spoken to an owner of a 755 who does at least 200 hours a year in all weathers and doesn't feel there's a particular problem with these ribs.
thanks
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Old 26 October 2014, 15:48   #2
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There was a design change so you'd probably want to know if it was before or after the change as MAIB thought the change may have been partially related.

I'd also want to consider if my engine was 'over powered' for what I need rather than over powered for its CE mark.

I'd want to have a control that had neutral lock.

Hope that makes sense...
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Old 27 October 2014, 14:31   #3
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There is a video online of the MAIB test somewhere.
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Old 27 October 2014, 14:37   #4
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Originally Posted by ShinyShoe View Post
I'd also want to consider if my engine was 'over powered' for what I need rather than over powered for its CE mark.
...

Does the CE actually specify a hp? I thought that CE marking was a tad more ethereal than hard numbers


.....sh1t happens.......
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Old 27 October 2014, 14:55   #5
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Does the CE actually specify a hp? I thought that CE marking was a tad more ethereal than hard numbers


.....sh1t happens.......
The builder has to state a max HP to put a CE mark on it. His technical file should either determine this according to an established formula, or be validated with a series of (specified) practical tests.
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Old 27 October 2014, 14:59   #6
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So it's the builder that specifies the max hp, not the CE spec.


.....sh1t happens.......
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Old 27 October 2014, 15:29   #7
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So it's the builder that specifies the max hp, not the CE spec.
The builder specifies it, but they can't (shouldn't?) just pluck a number out the sky - how they determine it is specified by the regs.
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Old 27 October 2014, 16:03   #8
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Does the CE actually specify a hp? I thought that CE marking was a tad more ethereal than hard numbers
The CE mark requires that the maximum power rating is marked on the hull.

The point being that a boat could be rated to 100HP on its CE plate. There are people on this forum who would put a 120HP on it and would be perfectly capable of using it without killing themsleves. Others would say the 100HP is over rated and 75HP is enough for normal use.

So if I was wanting to get maximum speed, pulling power, maximum capability and had a decent skill level I'd stick 120HP on it. But if I was only going to use it with the family for some nice beach runs on nice days I would say 75HP would do...

The risk is people try to fit the boat out to the plate...
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Old 27 October 2014, 16:10   #9
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The builder specifies it, but they can't (shouldn't?) just pluck a number out the sky - how they determine it is specified by the regs.

Right the reason I'm asking is that I've seen a few quotes on posts recently referring to the "CE rated hp" which would
Imply that the max hp for a given boat is dictated by the CE regs rather than the manufacturer. In reality the manufacturer can rate a boat at whatever he likes AS LONG AS HE CAN QUALIFY IT.


.....sh1t happens.......
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Old 27 October 2014, 17:46   #10
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I've had mine for 5 years. Mine is 9 years old, an 8.6 and "underpowered" with a meagre 275 on the back and has the softer profile hull. (There is one around with twin 275s!). Never had a hint of unruly handling. Predictable, safe and solid. Not the deepest v or the best ride but as a family orientated rib it is hard to fault. This is my 4th rib and I've owned, speedboats, muscle boats, sailing boats and a couple of Sunseekers over the last 45 years, so I have some experience and would know by now if it was unsafe. It's a good solid mid/upper tier rib with a touch of style.

Like everything it depends what you want it for. Wave jumping, probably not, comfortable cruising, with loads of storage, skiing, lazing about, and a decent turn of speed, definitely.
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