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Old 10 October 2007, 15:08   #1
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Small rib vs large SIB

I am wondering what are your views on a large sib e.g 5m humber or 4.7m zodaic vs a small rib e.g 4.5m valiant. Your thoughts on Comfort,dryness, use for beaching etc

As I have an ex RNLI 40 hp mariner either type of boat may suit (18" shaft, tiller steer, Two stroke)

Does anyone know of a dealer for Gemini in the UK or Ireland?
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Old 10 October 2007, 17:33   #2
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How about a good old compromise - a Zapcat??? Awesome beasts!!!
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Old 10 October 2007, 17:43   #3
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The boat would be used for the family. I have considered a zap cat but I don't think it would suit for diving, snorkling etc
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Old 10 October 2007, 18:26   #4
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Having just old a 4.9 valiant an bought a mk3 futura 4.5 m the difference is "chalk and cheese" there is no comparison IMo between a sib and a small rib .

Even the big futura is very bouncy and uncomfortable in any sort of chop , where the rib used to just skim over the top without even noticing it .

Advantages of the sib are more space if its tiller controll , much quicker turning and fun for messing about in surf etc plus you can use transom wheels or even carry it with a few hands .
If you don't want to go far and want to land in small coves etc then the sib is great .

Worst part of the new sib for me was the fuel ecomomy from the yam 25 2 stroke . It used just as much fuel as the DF70 on my rib but did just over half the speed .
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Old 10 October 2007, 18:31   #5
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Quote:
Originally Posted by two stroke mick View Post
I am wondering what are your views on a large sib e.g 5m humber or 4.7m zodaic vs a small rib e.g 4.5m valiant. Your thoughts on Comfort,dryness, use for beaching etc

As I have an ex RNLI 40 hp mariner either type of boat may suit (18" shaft, tiller steer, Two stroke)

Does anyone know of a dealer for Gemini in the UK or Ireland?

gemini dealers are gone bust I think in UK , couldn't contact them at all and emails returned .

If you want to make good use of that engine it would be great on a BIg futura if its a long shaft , but get the alloy floor , I reckon 40 hp would buckle the air floor from the feeling I got with mine in waves .
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Old 11 October 2007, 04:10   #6
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Thanks Ian

I am leaning towards a tiller steered rib circa 4.5m like the DR450. I would like a boat that could cover circa 15nm without been too rough on the passengers.
The boat would have to be light enough to be launched and reterved on poor quality, steep slips with a two wheel drive car.
I also woul like to be able to beech the rib. I think that I will have to remove a section of the transom by 2 " as the shaft lenght is 17.5 or 18 " not a 20" long shaft
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Old 11 October 2007, 04:29   #7
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SIBs - good if you plan to beach a lot, coz they have next to no draught. Somewhat uncomfortable in anything other than flat water when on the move.

RIBs - good on the move, but a tad more of a pain to beach.

As for room, why not have a tiller control RIB? The old 3 cyl Yam 30 went quite nicely as tiller control on the Avon SR4. Infinitely more manoeverable as well on the tiller. Also if ytou go tiller, you've just saved the weight of a console, which oin a smaller rib might not be a bad thing.......
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Old 11 October 2007, 05:37   #8
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Quote:
Originally Posted by two stroke mick View Post
As I have an ex RNLI 40 hp mariner either type of boat may suit (18" shaft, tiller steer, Two stroke)
The seakeeping of a good SIB is not to be sniffed at, obviously they cannot compete with a hard deep v and a narrow beamed RIB, but they are capable and fun.

The main difference, since you already have an engine, is going to be performance; a big 5.3m SIB is going to be far lighter than a 4.5m RIB.

The next big difference is value, for the same money you will get the boat and launching wheels some nice gadgets and maybe even a trailer.

This is smaller then you are after, but it gives you an idea of the level of gear you can get for your money:
http://www.boatsandoutboards.co.uk/view/MHM141

Cheers,
Martin
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Old 11 October 2007, 07:52   #9
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I think a SIB would be too bouncy and wet for covering any distance greater than 3 or 4 miles. I believe that a small tiller steered rib would provide a dryer, faster and more confortable ride. I do not intend messing about in the surf. With respect to beaching the boat would be used to get on and off a beach not fooling around in the surf.

Has anyone out there a small Tiller steer rib? If so how do you find it? what are it's limitations?
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Old 11 October 2007, 08:31   #10
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My searider is tiller steered. Although I eventually plan on fitting a console.

I'v been using a 25hp. It is very manouvrable and the boat is very light, however I find it difficult to use on my own without weight in the bow. But with extra passengers its fine.

The main problem is that you don't feel as safe or as confident as you would if you were using a console. Make sure there are plenty of handles and ropes for you and your passengers to hold on to.
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