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Old 26 June 2011, 05:26   #11
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I have my gauges set to show l/nm not l/h, personally I think that fuel/distance is more meaningful than fuel/time. So I'm not 100% sure of my consumption/hour, so....

@ 3800rpm i'm doing around 28kn & 0.65nm/l =comfortable cruising speed.

@ full chat 5750rpm I'm doing 45kn & 0.5nm/l =teeth rattling

The best I can get is 25kn@0.75nm/l on calm water, lightly loaded & fully trimmed up.= zzzzzzz!

So there is a 50% difference between best & worst, extrapolating the figures gives about
90l/h worst case & 33l/h best case, "Normal" cruising i'm doing around 43 l/h which I don't think is too bad with twins.
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Old 26 June 2011, 16:46   #12
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Hi. I have a yam 80hp 4stroke. Worst case is 22lt an hour. If it was me I would be basing all my calculations on worst fuel consumption. That way you should always end up with fuel to spare upon your return.

Cheers

Gdog.
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Old 26 June 2011, 16:57   #13
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In my real boat days I used a slightly different technique. I used my cruising average to make sure that I had a 50% surplus of fuel in my main tank to allow for overruns. Then I had an extra supply in deck tanks that gave me a known 30Nm range at modest speeds - enough to get me to port/fuel in a worst case scenario.

Nowadays I just keep an extra 2 liters of premixed gas in my pack - same thing!
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Old 26 June 2011, 17:15   #14
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Not wanting to hijack the thread but it would appear that Yam HPDI, Optimax and e-tech, 150hp variants, use the about same ammount of fuel.
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Old 26 June 2011, 17:16   #15
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Quote:
Originally Posted by martini View Post
Pah, that's nothing , at full chat I'm using 160 l/hr to do 40 kts, cruising at 4500rpm I get 30kts at 90 l/hr

Next one's going to be diesel
But isn't petrol tax free in the CI?
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Old 26 June 2011, 17:40   #16
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But isn't petrol tax free in the CI?
Still 90 ppl though
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Old 27 June 2011, 10:37   #17
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I'll have two at that price!
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