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Old 27 October 2015, 16:56   #11
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Originally Posted by jeffstevens763@g View Post
Some experts will be along shortly. Im certainly no expert but I duspect they will say a 90 on a 6m is usually underpowered and if you want to use it at sea in rough stuff they will recommend more power.

if 40 mph 4 adults up 6 m boat is underpowerd then you need a 150
Hi Jeff.

A fair point, well made. I will see what other views there are too.

I had wondered if there was some sort of formula for working out engine power to load carried or length of RIB. I suspect that RIB length may impose some absolute practical limit on engine power but as with so much at this stage of my boating career... it is just a guess.
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Old 27 October 2015, 16:56   #12
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Is that Abington Jeff??

http://www.rib.net/forum/attachment....8&d=1445940277
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Old 27 October 2015, 16:58   #13
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Changing from single to twins isn't trivial and the benefits may be less than you expect. Not all transoms would take the weight or power of two big engines either.
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Old 27 October 2015, 16:58   #14
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Hi, I bought my first boat a couple of years ago and I'm near Oxford.

I trailered it down to the south coast quite a few times as well as down to Cornwall. The Cornish coast was the best, IOW was good as well. But if I kept my boat in the UK Id drystack it.

Towing, launching, keeping your trailer in good nick, having a tow vehicle - all add time and money and need thinking about.

As for engine - I would get the biggest the boat can take safely, its up to you to use it responsibly. At least that way you wont be left wanting when you need more power, or left wondering if your missing out.

I now keep my boat in the Med, which was always the plan so I put up with a trailer for a couple of years. If I didn't have it in the Med Id probably keep it down somewhere like Poole - its a balance between where you live and where you like to take your boat.

Outboard gives you more space on the boat. Go out and test a few before spending money. I tested a few and went to the boat show to get a good idea of what I wanted.
Thank you Trimix.
Useful information and helpful to me at this stage.
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Old 27 October 2015, 17:00   #15
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welcome to the site. Trmix is right, go to a boat show. The Southampton one is best, lots of R.I.Bs etc on the water waiting to be tried. All the best for the future.
Many thanks uncle al. I will try to get to a boat show when I have some time free.
thank you for the good wishes.
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Old 27 October 2015, 17:07   #16
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Well. It a shame you have just missed the boat show and I guess you want to be up and running next year. I think for a 6m you need something larger than 100hp. You also need to think what weight it will be to tow and what car you have. The layout is also important. Side by side jockeys is definitely more sociable. Tank size. Budget etc are all factors. RMS has a Ribquest for sale which is a great boat that is worth checking out. There are also some RC585s on a boat and outboards.
Thank you for your helpful response pow2gran. Towing would require me to adjust my car by putting a hitch on it (Audi A6... one of VAG group's hookey ones ) and I drive it far too many miles in a year to want to tow boats and loads anywhere. I am now considering two 70s on a 6m RIB. What makes a Ribquest a great boat? I have looked at a few boards advertising boats of all descriptions and I do not know enough to know whether what is advertised is good or not. I need to start visiting boat vendors and having a few sea trials in boats which I feel I might buy.
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Old 27 October 2015, 17:13   #17
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Changing from single to twins isn't trivial and the benefits may be less than you expect. Not all transoms would take the weight or power of two big engines either.
Thanks Poly. Is there a particular type of transom I would need to ensure was in the specification? I have no idea what to ask for. Will it be obvious which hulls would permit two engines?

Please forgive the dumb questions.
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Old 27 October 2015, 17:14   #18
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The "ideal rib" with the "ideal engines" would cost around 150K....so lets get real.
Your 10k will get you the boat you're looking for. 100hp will do fine on the back of a 6mtr boat...... probably top around 40mph and cruise 25-30mph without any bother. My 6.5mtr does 43mph (4 up) with 130hp. tows two skiers and has covered the best part of 1000 mls coastal and offshore this year. HOWEVER....Fuel bills, two years dry stack, servicing ???
My fuel bill for this year will be over 1000. I trailer and keep at home but I'm guessing dry-stack will be 1000+ per year. I do my own servicing/maintenance and that will have cost me best part of 1000 this year. It's been a bad year! (includes trailer maintenance).
Generalisations always invite controversy and varying opinions but if you give a couple of examples of what you're considering buying, chances are someone here will have something the same or very similar and give you the benefit of their experiences.
Welcome aboard.
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Old 27 October 2015, 17:23   #19
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Thanks Poly. Is there a particular type of transom I would need to ensure was in the specification? I have no idea what to ask for. Will it be obvious which hulls would permit two engines?

Please forgive the dumb questions.
A bit like the diesel situation most people who opt for twins do so for very specific advantages. Essentially because the consequences of failure are worse for them than normal, or they are trying to get more power than is otherwise possible. Neither of those applies to you. I'm sure there will be people who start with one engine then add a partner as an upgrade simply to get more power but I have never heard of anyone buying a boat with that plan in mind.

Transoms have lengths, and the length, is different in the centre from the sides. They are also rated for weight and power. Most people would want separate fuel and electrics for each engine, and you need another set of controls (which depending on the first set might mean replacing them both). I don't think it's a newbie's upgrade path! Just buy the right boat the first time!
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Old 27 October 2015, 17:59   #20
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Post up some links to what has caught your eye and how many will be with you, type of weather you expect to go out in etc
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