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Old 09 February 2014, 13:02   #1
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Ribcraft 585 twins vs single engine

Any one any experience of a 585 with twins?

Considering this hull for round Britain. Also considering twins, I've seen one (Google seen not in the flesh) so it's possible but wanted some feedback from any users, it'll be a lot of weight at the back on a short boat.

The alternative is probably the new Merc 150 4stroke. I'd rather like an opti as I LOVE them but I'm not sure I could stand 12 days of opti noise in my ear when I know I could have had a 4 stroke.

Same debate with twins really. Pair of 75 or 90 opti' is rather tempting but a pair of F80's aernt much heavier.
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Old 09 February 2014, 13:14   #2
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Any one any experience of a 585 with twins? Considering this hull for round Britain. Also considering twins, I've seen one (Google seen not in the flesh) so it's possible but wanted some feedback from any users, it'll be a lot of weight at the back on a short boat. The alternative is probably the new Merc 150 4stroke. I'd rather like an opti as I LOVE them but I'm not sure I could stand 12 days of opti noise in my ear when I know I could have had a 4 stroke. Same debate with twins really. Pair of 75 or 90 opti' is rather tempting but a pair of F80's aernt much heavier.
Why don't you give Jace at Ribcraft a phone as a RC owner I've always found them most informative re what my 585 can do it not. They are also very supportive and I think would more than assist if you tell them your plans.

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Old 09 February 2014, 13:28   #3
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The boat won't be new but yes, hadn't thought of doing the obvious - asking the manufacturer !

Never the less, if anyone has owned or driven or comments welcome !!
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Old 09 February 2014, 13:39   #4
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Why would you fit twins on such a hull? - Lots more weight at he back and what about fuel supply - I think that normally a 585 has single built in tank. I'd want separate tanks, one for each engine.
I think the 585 has a max rating of 140 - but give Ribcraft a call.
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Old 09 February 2014, 13:45   #5
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Twin engines are a good choice especially for around Britain cruise. I would definitely recommend the new 150 merc fourstroke brilliant engine and seems to be bombproof. Weighs only 206kg too. I'd be wary of using twin 80's or 90 opti's due to weight as you will be heading for 350 - 400 kgs with either of these which is a lump of weight on a sub 6m boat. If I were you I'd be thinking more along the lines of twin 60s at the 200kg weight total. You'd be better on fuel and the boat will probably perform better too as you will be saving a lot of weight. Remember merc also do the Bigfoot in the 60s to give better thrust for heavy load applications. Hope this helps even just to add to thoughts.
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Old 09 February 2014, 14:02   #6
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IMHO, the single Merc 150

...based on my experience over some of the RI2013.
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Old 09 February 2014, 14:04   #7
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Get the 150 on the Ribcraft, you'll love it!

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Old 09 February 2014, 14:04   #8
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I side with The Terrier Man...,Sub 6m RIBs do IMO labour with twins.unless you have a specific reason for wanting twins??...
I'd certainly prefer to spend the money you'd save on two!..pluss considerable rigging costs..tanks..ect ect .On a really good low hours single!...and a load of Fuel!
The FS 140 Suzi does a good around job,(ask AJ and Whisper..and without compromising balance and performance,as most of us know,it's not really about Top end BUT..keeping it Nimble responsive! ESPECIALY in the Rough Stuff.
GREAT Hulls they are though
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Old 09 February 2014, 14:18   #9
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Quote:
Originally Posted by lakelandterrier View Post
Why would you fit twins on such a hull?.
Like Peter says, for a round Britain !

I'm well aware of the common point of failure being one fuel tank but I'll be carrying a lot of additional fuel not in the main tank some of which will be in engine tanks so if a contamination were to occur there would be some resilience although limited endurance.

I did think of lifting the deck and retanking, but that's going to be too much work and expense for me in the timeframe.
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Old 09 February 2014, 14:19   #10
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The FS 140 Suzi does a good around job,
There is an emerging issue on these with the water pump. Might be worth a google before any purchase.

Chris
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