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Old 16 January 2005, 06:24   #21
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Quote:
Originally Posted by Daniel Vanesse
And why not considering and O/B diesel? Take a look at www.jetpac.us
It's like a RIB with piles!?
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Old 16 January 2005, 08:24   #22
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Quote:
Originally Posted by jwalker
Cumon, tellus the story....
8m Ribtec with a Yam 240 6 cylinder engine in it. Big heavy engine with a big prop mounted a the back of a narrow hull. Result was an interesting drive to say the least. Put the power on from standstill and the bow came up and the boat steered hard over. Reduce speed from 20 knots to walking speed and the hull steered hard over the other way. It was quite possible to drive this boat without even touching the steering wheel, just by playing with the throttle. As a side note altering the trim made little difference so it wasn't that causing the problem.

Just glad it wasn't my 30+k that had been spent on this rib or it would have been straight back to the manufacturers. Boat looked very pretty on the pontoon, but I declined the offer to take it out of the River Itchen into Southampton Water.

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Old 16 January 2005, 15:12   #23
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Quote:
Originally Posted by Daniel Vanesse
And why not considering and O/B diesel? Take a look at www.jetpac.us
Looks like an interesting concept, but I'm not convinced that having that much weight that far back would actually be an advantage! Have you tried one?

Any idea of pricing?

<edit>
The JetPac weighs nearly twice as much as a 150hp 4-stroke outboard, which in itself is quite a heavy lump to put on a 6.5m RIB!
</edit>


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Old 16 January 2005, 15:17   #24
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Quote:
Originally Posted by Pete7
8m Ribtec with a Yam 240 6 cylinder engine in it. Big heavy engine with a big prop mounted a the back of a narrow hull.
There's got to be more to it than that. There are plenty of RIBs this size running this sort of engine with no reported handling issues. Was it an installation/rigging problem?

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Old 17 January 2005, 03:42   #25
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There's got to be more to it than that. There are plenty of RIBs this size running this sort of engine with no reported handling issues. Was it an installation/rigging problem? John
Boat belonged to a former Ribtec employee so you would have thought he would have got it right. Didn't see the boat out of the water so can't comment on the transom or rigging and engine bay was just black with oil. Might have been an outboard rib converted I suppose, however hull did look very narrow, like a 6m rib with 2m tacked on the back end.

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Old 18 January 2005, 11:12   #26
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i own a 7.5 meter rib with 2x240 yamahas in it and it handle,s fine so dont understand how an 8 meter rib cant take it from one engine,
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Old 18 January 2005, 11:35   #27
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Quote:
Originally Posted by tonka
i own a 7.5 meter rib with 2x240 yamahas in it and it handle,s fine so dont understand how an 8 meter rib cant take it from one engine,
Tonka
With a twin engine instalation it would be running counter rotating props, so torque would be cancelled out by the other prop,
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Old 19 January 2005, 04:12   #28
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Originally Posted by tonka
i own a 7.5 meter rib with 2x240 yamahas in it
Wow! That must be a tight squeeze! Do you have any pictures?

How does it handle with over a tonne of engines and drives?

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Old 19 January 2005, 04:41   #29
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Hi Tonkabut your boat was designed for sturdiness and to handle the power The Hull probably weighs a ton more than the hull in the original question! I can understand you mentioning having a Delta with twin 240's I'd be shouting about it from the roof tops if it were mine.

My favourite rib so far was /is Jim Mac's 'Still Deep one' wonderful boat and very well put togetherI think that was an 8.5 delta with twin yammies.

The ribtec ws a 7.5 by the way
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Old 19 January 2005, 11:18   #30
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Heavy hull or not, thats still hell of a lot of weight to have in the stern of a 7.5m RIB.

Must have been a big shoe-horn

I guess the working space under the hood is very confined. Do you find it difficult to do maintenance and repairs etc?
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