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Old 27 October 2005, 03:22   #21
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Prosport 8.8m rib with Suzuki DT 225 efi(last of them) fitted to a 10" setback transom jack. 15hp Suzuki aux.

Codders - what will this weigh in when fully furbished?? I reckon about 1800 kgs+.
I would have gone for twins - 2*140 suks- you will probbaly find that pushing a near 9 meter rib against a force 5/7 with a 225 is not enough?? what prop will you be using??

Jonathan
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Old 27 October 2005, 03:41   #22
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Quote:
Originally Posted by codprawn

I have yet to see the CMC in the flesh but haven't really seen any bad reports on them!!!


Here's one - they break easily on a RIB with an XR2 on in race conditions and only last about 1 - 2 hours!
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Old 27 October 2005, 07:24   #23
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Quote:
Originally Posted by eupa
Prosport 8.8m rib with Suzuki DT 225 efi(last of them) fitted to a 10" setback transom jack. 15hp Suzuki aux.

Codders - what will this weigh in when fully furbished?? I reckon about 1800 kgs+.
I would have gone for twins - 2*140 suks- you will probbaly find that pushing a near 9 meter rib against a force 5/7 with a 225 is not enough?? what prop will you be using??

Jonathan

Cost was one reason - 2x 250 ETECs would have been nice!!!

Having said that from what I can gather twins don't give that much extra grunt cos they are too close together!!!

Another problem often overlooked is all that extra weight hanging off the transom - seems to me RIBs tend to pitchpole more than they capsize!!!

I have a 4 blade stainless prop at the moment - ordered a 21" but they sent a 19" so will try that first - may well have 2 different props anyway - one for lightly loaded - one for full load.
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Old 27 October 2005, 07:25   #24
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Originally Posted by Cookee
Here's one - they break easily on a RIB with an XR2 on in race conditions and only last about 1 - 2 hours!
Was that from personal experience???

I have looked hard on the net but can't find any complaints - maybe the Yanks just don't use them as hard???

Where did it break and which jackplate was it???
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Old 27 October 2005, 08:54   #25
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Now you've gone down the CMC route, I hope you specified the S/S motor rails or you probably won't make it back from the Channel Islands if it's at all lumpy.

The weakest point tends to be the fixings in the side working loose or snapping, although the ram mount is a weak area. I've always replaced the side (slider) bolts with longer ones to enable me to fit a large heavy washer and a nut wire locked in place, don't like the way they rely on a bolt fixing tapped into the bracket.

Most of the people who use them in the States are running very high performance but quite small craft, nearly always on a lake or river, but rarely in offshore conditions. Bass boats as shown being a typical application. The manual plate is quite often used to establish the optimum engine height, and then it's either welded together, or replaced with a custom box!

And don't come blubbing back to the forum when your motor falls off, coz it will.

Might be a good idea to invest in good quality shift and throttle cables, as I've seen numerous motors hanging from them after the lifter failed, don't go buying no cheap ones!!!!!!!
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Old 27 October 2005, 09:13   #26
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Originally Posted by codprawn
Another problem often overlooked is all that extra weight hanging off the transom - seems to me RIBs tend to pitchpole more than they capsize!!!

Eh? I've NEVER heard of a RIB pitchpoling (assume you mean going end over end). Oh no, I lie, there was the case of the the Whitstable (I think it was Whitstable) Atlantic 21 going end over end in surf. Perhaps you could give the RNLI the benefit of you expertise in this area? Anyway, never heard of a leisure rib pitchpoling. And surely by setting the engine back you are excacerbating any weight distribution problem?
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Old 27 October 2005, 09:33   #27
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Another problem often overlooked is all that extra weight hanging off the transom - seems to me RIBs tend to pitchpole more than they capsize!!!

That's why on a near 9 meter rib you will NEED trim tabs. Would suggest a 23" prop for a 225. What speed are you hoping to ger?

Jonathan
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Old 27 October 2005, 11:29   #28
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Quote:
Originally Posted by Alan
Eh? I've NEVER heard of a RIB pitchpoling (assume you mean going end over end). Oh no, I lie, there was the case of the the Whitstable (I think it was Whitstable) Atlantic 21 going end over end in surf. Perhaps you could give the RNLI the benefit of you expertise in this area? Anyway, never heard of a leisure rib pitchpoling. And surely by setting the engine back you are excacerbating any weight distribution problem?
Yes setting the engine back does make it worse but I needed more room in the boat - to compensate I asked for the console to be moved forward a bit. Hopefully my engine with setback won't be as bad as twins without it!!!

You may never have heard of a leisure RIB pitchpoling but it must happen to some people - I have watched loads of videos of RIBs in rough conditions and they all nearly all seem to lan very much stern first. Especially the twin engined ones!!!

Not leisure but this video proves the point - watch at the very start!!!

http://www.boomeranger.fi/images/ind...conditions.mpg

Great video for those who have never seen it before!!!
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Old 27 October 2005, 11:30   #29
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Quote:
Originally Posted by eupa
Another problem often overlooked is all that extra weight hanging off the transom - seems to me RIBs tend to pitchpole more than they capsize!!!

That's why on a near 9 meter rib you will NEED trim tabs. Would suggest a 23" prop for a 225. What speed are you hoping to ger?

Jonathan
Yes getting the QL ones discussed on here a while ago....
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Old 27 October 2005, 12:10   #30
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Quote:
Originally Posted by codprawn
You may never have heard of a leisure RIB pitchpoling but it must happen to some people - I have watched loads of videos of RIBs in rough conditions and they all nearly all seem to lan very much stern first. Especially the twin engined ones!!!
Ah, silly me, I'm confusing experience in yer know actual ribbing with received wisdom from watching video's.
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