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Old 07 April 2004, 09:55   #11
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Country: UK - England
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Make: Solent Rib Princess
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Originally Posted by Rogue Wave
If you look at the CE plate on the back of your rib you will find it's rated for al lot more people than one would want to put on it. I think they do it on weight. My Avon 8.4 is rate dfor 24 and my 4.7 was rated for 7 ( which beggars belief!)
Hi rogue
not the dreaded RCD CE PLATE again
i know what you are saying ref this it just seems a awful lot of people for that size rib, even on the 7.5 it would be a squash how ever if the company can build them like that ,who am i to argue different countries different regulations i think its a great oportunity for this guy and i agree with you in regards to performance with this amount of people and the safety aspect
but that will be down to engine selection and safety policy but great venture
and good luck
tim
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Old 13 April 2004, 19:17   #12
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Thanks for all the replies. I was out doing research for the project and I'm sorry I didn't take part in the replies. As for the seating and safety issue, this configuration has been around for a while and tested under some adverse conditions.... see photo.
[IMG]
Judging by the replies I need more hp, maybe 285-300? Reliability is my most important consideration, since down time = no income. Ease of maintenance and fuel economy come next. Does anyone have an opinion on the most reliable sterndrive motor/leg combination for this type of application? Mercruiser/Volvo/Yanmar and which leg? I would even go with petrol I/O or outboard if it was a more reliable option. Low-end torque is more important than top speed because of the weight.
Thanks for sharing your experience!
Rob
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Old 14 April 2004, 10:16   #13
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Country: Greece
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WOW the boat looks huge Robbie
Am I to assume that you have 3 seats per row rather than 4?
Feel pity for the guys sitting in the bow section though
By the way did you say that you operate it in sea or fresh water areas?
Does it have a CE certificate, in what category is clacified to be and by which agency?
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Old 14 April 2004, 10:45   #14
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Quote:
Originally Posted by Manos
WOW the boat looks huge Robbie
Am I to assume that you have 3 seats per row rather than 4?
Feel pity for the guys sitting in the bow section though
By the way did you say that you operate it in sea or fresh water areas?
Does it have a CE certificate, in what category is clacified to be and by which agency?
It's hard to believe it's under 8m, isn't it? The Ribs in the pictures have 4 seats across and hold 27 passengers, but I would go for 3 across for room to move around on deck. Mine will hold 22. It will be used strictly in salt water. The agency down here in Brazil who governs the ratings is the Port Captain, and they usually go along with whatever the manufacturer says is the capacity. The category they's give this (translation) is for a passenger boat operating within 10 kilometers of the coastline. Definitely a lot less regulation than what you have there.
The more I'm reading about problems with stern leg problems on bigger diesels the more I like the outboard option. What do you think?
Here's another configuration for the inboard model... holds 22 and the crew sits on top of the engine hatch. I'd probably keep the number of passengers down to about 16 so nobody sits on the bow for the open ocean part of the ride.
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Old 14 April 2004, 10:51   #15
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Outboards would have been my choice rather than inboards.
The boat looks huge and 3 pax per row sounds more reasonable rather than 4. However if the boat is not CE marked and category certified is illegal for operating in European waters (unfotunately).
Enjoy it in Brazil is a great country from what I can remember the little time I've been there sometime in the past
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Old 14 April 2004, 11:13   #16
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Hey Manos, I think our posts crossed paths. I'd be really curious to find out why you'd opt for outboards?
My thinking, correct me if I'm off, is that for a commercial operator, any problems with an inboard/outboard system would keep you out of the water for days if not weeks. An outboard can be swapped out with a borrowed or spare unit in less than a day!
Petrol costs about 40p per gallon more than diesel here, however.
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Old 14 April 2004, 11:23   #17
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As my engineer said sometime ago outboards have less moving parts (apparently) than inboards, hence less chances for things to go wrong. Most of my friends that have inboards have some kind of a problem (big or small) from time to time.
If you have a problem with an outboard and you need to change it, as you say, out she goes and put another one on in about 30 mins. With an inboard it may take a day
I like outboards and 2-strokes my self, proven and tested and the engines that are made today NEVER go wrong (at least 99% of the time )
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Old 14 April 2004, 11:28   #18
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Engine choice

Robbie,

Do the suppliers have a diesel engined demo boat?
If you could ballast this up to a full loaded displacement then you could decide for sure what engine is required. It's going to be a heavy boat with 16+ people on board.

My concern would be the engine bogging down when trying to get onto the plane. Perhaps a Volvo KAD43 / 44 / 300 series engine might suit as these have superchargers for low end torque.

Another option would be to consider a waterjet - this would allow the engine to spin up to maximum speed irrespective of load. However, this option is likely to push the cost up and probably take up more space in the boat.

There are several users on here with bigish ribs with single diesels - perhaps they could chip in?

Duncan
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Old 14 April 2004, 11:37   #19
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Quote:
Originally Posted by Manos
As my engineer said sometime ago outboards have less moving parts (apparently) than inboards, hence less chances for things to go wrong. Most of my friends that have inboards have some kind of a problem (big or small) from time to time.
If you have a problem with an outboard and you need to change it, as you say, out she goes and put another one on in about 30 mins. With an inboard it may take a day
I like outboards and 2-strokes my self, proven and tested and the engines that are made today NEVER go wrong (at least 99% of the time )
Hmmmmmm.... tempting! Now for the dreaded question. Optimax or Honda four stroke? Would a single 225 do the job or a pair of 150's?
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Old 14 April 2004, 11:41   #20
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Quote:
Originally Posted by Searider
Robbie,

Do the suppliers have a diesel engined demo boat?
If you could ballast this up to a full loaded displacement then you could decide for sure what engine is required. It's going to be a heavy boat with 16+ people on board.

My concern would be the engine bogging down when trying to get onto the plane. Perhaps a Volvo KAD43 / 44 / 300 series engine might suit as these have superchargers for low end torque.

Another option would be to consider a waterjet - this would allow the engine to spin up to maximum speed irrespective of load. However, this option is likely to push the cost up and probably take up more space in the boat.

There are several users on here with bigish ribs with single diesels - perhaps they could chip in?

Duncan
Searider,
I think I'll get a chance to test one this weekend if I'm lucky. They've put a couple of Merc 220hp diesels in with Bravo 3's, but those were set up for half the passengers. I think I'll try to get in touch with some owners.
As for waterjet, no one here know what one is let alone be able to work on one! The simpler the better down here.
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