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Old 23 March 2004, 05:15   #1
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Country: UK - England
Town: braintree
Boat name: PAPA TANGO
Make: Humber
Length: 6m +
Engine: twin 60hp Mariner
Join Date: Mar 2004
Posts: 4
One or Two engines??

Having spent ten years having fun in small RIBs it's now time to get serious. I'm beginning to spec out my ideal RIB for everything from cruising to pulling the kids on a board. Arrived at an ideal length of 6.5m (constrained by budget) but unsure on engine configuration so two questions for the forum:

1. Are two engines better than one (say two 75s or one 150hp)?
2. How massive is the difference in running costs between a 150hp out board and an inboard?

Cheers!

MArk

PS any other comments on what RIB to go for would be appreciated, (20k budget).
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Old 23 March 2004, 05:37   #2
RLS
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Country: UK - Channel Islands
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Make: Rib-X
Length: 6.4m
Engine: Outboard 200 Merc Optimax
Join Date: Dec 2003
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Mark. I have just ordered a 6.4 Rib-X. (www.rib-x.co.uk) These are Falcon made Hulls and tubes from South Africa and then they are finished off over here. Colin is the man you want to talk to at Rib-X, the number is on the website. Very reasonably priced and in your budget. I have gone for a 6.4 with a Mercury 200 Opti on the back. Colin's demo boat had a 140 suzuki four stroke on the back that gives 48 knots I think he said - fast and safe for the family.
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Old 23 March 2004, 06:09   #3
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Country: UK - England
Town: Leicester
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Make: Patriot Rib
Length: 8m +
Engine: 300 Verado
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Twins or single

Mark, I am looking for a similar boat to you and have been thinking about the same problem! The general difference between having twins opposed to a single, is that with twins you ae going to get much more torque, and therefore for pulling people on boards it proves very easy! However you would probally get more speed out of a single as the overall rig would be lighter. I am currently looking at the 6.5, prosport ribs and the 6-6.5 solent ribs. Both look very promising!

Let me know how you get on!


James
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Old 23 March 2004, 08:32   #4
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Country: UK - Scotland
Make: HumberOceanOffshore
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It's been discussed lots of times. Do a search, or two.
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Old 23 March 2004, 08:58   #5
RLS
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If you are going for an engine of 150hp that has more than enough torque to pull anyone out of the water. One engine will indeed give a higher top end speed. However if you have 2 engines it does have the added safety bonus.
You also have to think of service costs - 2 engines will be more than 1!
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Old 23 March 2004, 10:12   #6
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It also depend how many people tou intend to pull out! Just incase you fancy trying a pyramid!
Just a thought!
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Old 23 March 2004, 11:11   #7
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Country: Greece
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Boat name: GATO DI MARE
Make: MAR.CO
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Engine: Yamaha 200Vmax
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Is very funny to see my boat with RIB-X sticker on it LOLOL

And my boat is NOT FOR SALE
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Old 23 March 2004, 11:29   #8
RLS
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Country: UK - Channel Islands
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Manos, Have your Falcons arrived yet? How many on order again? - Is it 5?
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Old 23 March 2004, 11:42   #9
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Id say with the new engines becoming ever more reliable only 1 engine is required now. Cheaper, lighter, faster.

Have a look at a diesel though. Merc 1.7 dti that im having gives 120hp at the prop and is most commonly fitted in a 6.5m rib. Volvo D3, can just about be squeezed into a 6.5m. Voltswagon marine are producing a rival too.

An engine around the 100hp mark will use about 1 litre per mile, at a cruising speed of 30 mph you'll be using 30 litres. With teh merc 1.7 diesel you'll use around 10 litres. Huge fuel savings if you can stomach the extra cost when you buy the boat.
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Old 23 March 2004, 11:49   #10
TIM
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Country: Ireland
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Make: REDBAY 7.4
Length: 7m +
Engine: OPTI 225
Join Date: Aug 2002
Posts: 417
ONE LUMP OR TWO ????

Both have there advantages, But if i was going for Rib again, i would go for one motor..........

The twice we have lost one engine was always down to fuel supply, ie something in the hose... or something like that, but single engine with bullet proof servicing, plugs, fuel and oil.... will run and run..... you can always add a aux in necessary....

Take off with two engines, is wicked but the advantage is lost at the top end........

The biggest advantage though is manoverability..... second to none..... Pitty as Gavin has yet to learn !!!!
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