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Old 15 September 2008, 08:40   #11
JSP
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Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
Quote:
Originally Posted by Pete7 View Post
I would have a look at something like this, from experience the Johnson / Evinrude 70s use about 4 gallons a hour which in the grand scheme of things is pretty good for a rib.

Could it be launched across Ainsdale beach? yes with care and long ropes, but have a chat with the fishing club first to see how they do it.

Would it go to the IOM in good weather, yep

Pete

http://rib.net/forum/showthread.php?t=26218

Pete
Cracking looking boat. I've seen it advertised on B&O. Sadly I can't spend 5 grand right now
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Old 15 September 2008, 15:39   #12
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Country: UK - England
Town: Macclesfield
Boat name: Aqua Fresh
Make: Zodiac Medline
Length: 5m +
Engine: 60hp Yamaha
MMSI: 235051988
Join Date: Feb 2006
Posts: 333
re MPG

Hi I have a Zodiac Medline 1 which is around 4.9 metres and has a 60 Yam 4st on the back

In a recent(3 months ago) trip 2 up to Arklow from Pwhelli around 80 miles each way

i used 30 litres going and around 50 litres comming back
going was at around 22-25knot and back was 25-30 knots it took around 3 1/4 hours going and just under 3 hours back

so at a rough guess i reckon on 8 litres per hours going and 15 on the return journey which was mainly at WOT

hope this helps

ps zodiacs are not bad boats for the money and is rated for 9 people i have had 4 adults 2 teenagers and 3 kids plus a dog and bags cool boxes etc and it still pulls 20 knts

Andy
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Old 15 September 2008, 19:22   #13
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Country: UK - England
Town: cornwall
Boat name: nothing
Make: rib eye 430
Length: 4m +
Engine: tatsu 50
MMSI: 666
Join Date: Mar 2006
Posts: 1,916
Quote:
Originally Posted by two stroke mick View Post
I have a 60 hp ETEC on a 4.9m valiant. It would want to be calm and you would want to be brave to run with it flat out. A lot depends on the weight of the boat which you purchase. The boat is rated for 80 hp. I would not like to try 80 hp on the back of my boat. I would usually use 18/20 lt of petrol for 3/4 hours crusing about

TSM

I think that answers the question well . I had a 70 suzuki 4 stroke on the same boat and its used more fuel than that and by the sounds of it wasn't as fast . the suzuki was about a third heavier than the etec .
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Old 15 September 2008, 22:33   #14
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Country: Canada
Town: Tobermory, Canada eh
Boat name: Verius
Make: Zodiac Hurricane 590
Length: 5m +
Engine: Yamaha F150
Join Date: Oct 2006
Posts: 1,345
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As others have pointed out, so much depends on the specific boat... the weight and hull design, and of course the typical load you will be carrying.

My boat, a Zodiac Hurricane is 5.9 metres and weighs 1800 pounds. A friend just bought a Bombard 550 (5.5 metres) and it weighs 620 pounds. Mine is rated at max HP of 150, his is rated at 90.

If you put a 90 on my boat, I suspect it would barely plane with a load. His on the other hand, would go like a skunk with its tail on fire. (he runs with a 70, and with a load of four divers, it is very underpowered in his opinion...)

Pick the boat, and put as clse to the max on it as you can. You might not always use it, but it wil be easier on the engine in the long run, and will give you lots of juice when you want it...
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Old 16 September 2008, 06:53   #15
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Country: Canada
Town: Rigaud, Que.
Boat name: Rigaud Explorer
Make: 6m Bombard
Length: 6m +
Engine: Yam115
Join Date: Aug 2008
Posts: 90
I have an older Bombard 6m (98) and hull alone is about 850lbs with a Yamaha 115 2st. I go up on step easy with either a 19 or 23 pitch prop and manage to do 38-40knots with 5 people and gear. At cruising speed 20-25knots I manage to do .9L/mile, oh and the max rating for this boat was 120hp.
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Old 16 September 2008, 16:18   #16
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Country: UK - England
Town: bedford
Make: tornado
Length: 5m +
Engine: outboard 60hp merc
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small rib

I have a small 5m tornado (1998 model) with a 60hp 2 stroke Mercury on the back ( max rating is 90) and its a lovely little boat. The fuel use is around 3-4 gph and while I am sure a 4 stroke would be better it would certainly be alot more weight hung on the back, which would effect the handling.
Mine is quite capable of pulling a lightish monoskier/wakeboarder, take 4 divers and is big enough that is takes a force 4/5 sea safely, not that I try to go out in heavy weather.

It depends on your budget but old 2 strokes can be bought relatively cheaply and if things need fixing it usually doesn't cost the earth as thery are simple. (iboats.com is a great forum for fixing engine problems)

For a first boat an Avon 4,7 is great as with a 40/50 they go well, the trailer can be a simple unbraked type and they will comfortably fit in a single garage.

They are also light to haul around behind a modest sized car.

Davej
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Old 17 September 2008, 12:14   #17
JSP
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Country: UK - England
Town: Southport
Boat name: Qudos
Make: 5.4 Searider
Length: 5m +
Engine: Yam 115 V4
MMSI: 235068784
Join Date: Sep 2008
Posts: 3,930
Thank you for all your replies. I'm starting to build up a picture now of MPG. Thanks
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