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Old 18-02-2019, 04:42 AM
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Fuel consumtion chart for various boat motors

It not ideal as it doesnt mention the speed the boat is traveling at at different revs.

But its will tell you how much juice you can expect to burn at Wide open throttle. Thats almost 100l an hour for a Mercury Verado 250 efi

http://www.boat-fuel-economy.com/mer...umption-liters
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Last edited by yellow door 1; 19-02-2019 at 01:54 AM.
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Old 18-02-2019, 05:04 AM
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But Wide open throttle will get you the least amount of kilometres per litre.

Heres a random boat and motor test - the "sweet spot" occurs at about 3500 revs on this rig (most kilometers traveled per litre of fuel, while moving at a decent pace) - but 4500 rpms uses marginally more fuel but attains 10kms an hour more speed. - as you can see - the fuel efficiency drops away after 4500 rpm.

Someone please correct me if I'm interpreting this incorrectly - it wont be the first time
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Last edited by yellow door 1; 18-02-2019 at 08:40 AM.
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Old 18-02-2019, 04:54 PM
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Got it in one.

That was what I figured out with my engine 3500-4500 is the sweet spot for fuel efficiency. There is a fairly quick decrease in efficiency once you go over 4500.
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Old 18-02-2019, 09:01 PM
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"318 mph
The World Unlimited water speed record is the officially recognised fastest speed achieved by a water-borne vehicle. The current record is 511 km/h (318 mph) - achieved by Australian Ken Warby in the Spirit of Australia in 1978."

Yeah unless you are trying to give Ken a run for his money - there are advantages to not spending all your time at WOT - 30% to 50% more distance from a tank is a good start


Last edited by yellow door 1; 19-02-2019 at 02:02 AM.
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Old 19-02-2019, 12:22 AM
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Interesting to note that if you divide the LPH @ WOT by the HP of the motor you get around 380mls of fuel per HP across the range of those motors.

There is little variance regardless of which motor you run that formula on.
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Old 19-02-2019, 01:11 AM
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Interesting to note that if you divide the LPH @ WOT by the HP of the motor you get around 380mls of fuel per HP across the range of those motors.

There is little variance regardless of which motor you run that formula on.
Yeah that is interesting - every horse needs a feed
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Old 19-02-2019, 05:32 PM
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What I also found interesting was that traveling at 2500 revs burns almost as much fuel as 5000 revs -

that would explain why cruising the rivers at "5 Knots", with your nose trimmed up to create maximum wake to annoy rowers, burnt so much fuel on a 150hp VMAX
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Old 19-02-2019, 10:09 PM
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Originally Posted by yellow door 1 View Post
What I also found interesting was that traveling at 2500 revs burns almost as much fuel as 5000 revs -

that would explain why cruising the rivers at "5 Knots", with your nose trimmed up to create maximum wake to annoy rowers, burnt so much fuel on a 150hp VMAX
True, that 5 knots is a real bad speed for fuel consumption, that's why I do the rowers a favour and fly past them at WOT. They love it because it also flattens the wake out to a small crest.

ps, according to Hazy the 5 knot signs you see posted in the river only apply to under the bridge they are attached to, once you have passed the bridge it's full noise once again.
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Old 20-02-2019, 02:00 AM
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Yeah If only the rowers knew what was good for them - they could understand the Speeding breamers actually had their best interests at heart.

And that Hazy excuse is a ripper
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