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Old 24 June 2004, 19:48   #11
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Country: Other
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Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
Engine: Suzuki DF 140
MMSI: 235050131
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And its dead noisy as well. That is guaranteed to annoy everybody and sound dead hard in the process.

Seriously.

I bought my two stroke for simplicity, size and reliability.

That was the two main overriding factors. Fuel costs were a secondary factor.
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Old 24 June 2004, 20:01   #12
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Country: UK - England
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Got this from somewhere, have used compared it to several boats and it seems pretty accurate - for a rough guide! It's not new so the 2 stroke figures are for the good old carburetted premix models.

Fuel consumption

2 stroke outboard motor 0.5 to 0.6 litres per hour per horsepower
4 stroke petrol motor 0.3 to 0.4 litres per hour per horsepower
4 stroke diesel inboard around 0.2 litres per hour per horsepower
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Old 24 June 2004, 20:06   #13
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Country: Other
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Boat name: Zerstörer
Make: Ribcraft
Length: 5m +
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MMSI: 235050131
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I make that 20 Litres per hour for my Tohatsu 2 Stroke.

Sorry but that is way out.

I stick by my average of 2 Miles per Litre.

I am usually out for three hours and use 23 Litres.

About 8 Litres per hour.

And I boot it whenever I can.
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Old 25 June 2004, 06:01   #14
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Country: UK - England
Town: Salcombe, Devon, UK
Boat name: BananaShark
Make: BananaShark
Length: 10m +
Engine: 2xYanmar 260 diesels
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The race boat generally uses at least 1.5 litres per mile - thats a V6 200hp 2 litre Mercury XR2 on the 7.3 metre BananaShark race boat with a stepped hull weighing in at the new heavier weight of 950 kg dry to make it the correct weight for Formula 2 RIB racing regulations.
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Originally Posted by Zippy
When a boat looks that good who needs tubes!!!
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Old 25 June 2004, 14:20   #15
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Country: UK - England
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Make: bombard sib
Length: 3m +
Engine: petrol 15/3.5
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fuel consumption

I was out the other weekend on the bournemouth power boats cruise and used 46.6 litres for 68 miles(72 on gps).0.68 l/m,cruising speed was about 24 knots,4100-4300 revs,hourmeter showed running time of about 5 hours,about 2 galls per hr,engine is fairly new with 35 hours on it now.
I/ll go get my anorak
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Old 25 June 2004, 20:45   #16
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Biggles,
Remember that these are only for WOT and engine developing max power. I would guess that you don't run like that all the time, so your consumption would seem to be better, especially if you're running a lighter pitch prop for carrying a load.
I used to have a 5.5m dory with 85Hp yamaha, cruised at 21 kts but the engine's only developing about 40Hp, (Same boat did same speed or slightly more with 2x25Hp WOT) 1.1L / Nm. WOT was 30kts, and burnt a 25L tank in just under 30 mins. 1.7L / Nm. Current boat's a diesel and uses so little I can't be bothered working it out!
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