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Old 07 January 2010, 07:33   #21
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All I can say about my own figures is that the measurements are tank brim full to tank brim full and the mileages comes from the GPS. The figures I quoted for that trip are consistent with the figures I've got for the whole of the boat ownership.

I'm happy with their accuracy
Hehe, I wasn't doubting you.
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Old 07 January 2010, 07:33   #22
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Summary so far, with estimated 1:1 speeds in bold at the end:-

Zubenelgenubi: 30nm:25L @30kn (90 2/S) = 0.83 lpm 33kn
9D280: 35nm:30L @20kn (25 4/S) = 0.86 lpm 22kn
9D280: 24nm:30L @mixed (55 2/S) = 1.25 lpm 20kn
Leapy: 46nm:26L @20kn (90 4/S) = 0.57 lpm 28kn
Cypman: ?nm:? @30kn (140 4/S) = <1 lpm 35kn
TSM: ?:? @20kn (60 E) = 0.75 lpm 25kn
GordyP: ?:? @40kn (2x 150 Es) = 1.3 lpm 38kn
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Old 07 January 2010, 07:36   #23
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Cheers Leapy, will you settle for 25 though as I am trying to adjust to the theoretical speed where 1:1 is reached?
Sorry...misinterpretted your data. You're saying at 30kn/25kn I'd be doing about 1:1. Understand now 30kn is probably nearer the mark but I've never run it long enough to be certain.
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Old 07 January 2010, 07:37   #24
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Folk talk about how economical modern engines are, how 4 strokes are better that 2 strokes, how new tech 2s are better than old but they all seem to be around the 1lt/mile.
That was where I started from, it seemed amazing that everyone has the same rule of thumb yet with such a wide range of boats.

It came to a head when someone suggested that an 11m Redbay could not go 200nm without refueling, which if true would be a big departure from said R.O.T.

The key does seem to be speed, which is the biggest variable so long as you have a setup which will cruise without being at full throttle.

In other words, as Jeremy Clarkson would probably say, the bigger the engine the more economical your journey.
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Old 07 January 2010, 07:39   #25
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Hehe, I wasn't doubting you.
Yeh, I know you weren't...but life is full of folks making outlandish fuel consumption claims for boat/car... Just wanted to confirm that I wasn't guessing or living in dreamland
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Old 07 January 2010, 07:48   #26
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Old 07 January 2010, 10:49   #27
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Quote:
Originally Posted by malthouse View Post
Summary so far, with estimated 1:1 speeds in bold at the end:-


9D280: 35nm:30L @20kn (25 4/S) = 0.86 lpm 22kn
Small typo -
the Suz was a 2- stroke Autolube of C.1993 vintage.
Just in case anyone gets the wrong end of some random stick......
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Old 07 January 2010, 10:56   #28
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Summary so far, with estimated 1:1 speeds in bold at the end:-

Zubenelgenubi: 30nm:25L @30kn (90 2/S) = 0.83 lpm 33kn
9D280: 35nm:30L @20kn (25 2/S) = 0.86 lpm 22kn
9D280: 24nm:30L @mixed (55 2/S) = 1.25 lpm 20kn
Leapy: 46nm:26L @20kn (90 4/S) = 0.57 lpm 28kn
Cypman: ?nm:? @30kn (140 4/S) = <1 lpm 35kn
TSM: ?:? @20kn (60 E) = 0.75 lpm 25kn
GordyP: ?:? @40kn (2x 150 Es) = 1.3 lpm 38kn

Thanks for the correction.

The average so far is 28 knots to obtain a cruising range of 1 liter to 1 mile.

Which sounds pretty good to me.
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Old 07 January 2010, 11:29   #29
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The average so far is 28 knots to obtain a cruising range of 1 liter to 1 mile.

Which sounds pretty good to me.
...and a good fun/ ratio
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Old 07 January 2010, 12:10   #30
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I don't have any examples of actual distances etc to hand, but my set up does about 1.25l per mile at @25 knots.
I've never done any sort of distance at less than that speed consistantly so can't say if I could reach 1:1.

I've a feeling that the only way it's likely to get that low is when its on it's trailer behind the car

RIB is a heavy old Ocean 6.5 with a 1998 Suzuki DT200EFI(2-Stroke).
Considering the amount of hours I get to use the boat, and how little the Suzuki cost me, I can put a lot of petrol in it before it would have been cheaper to buy a more modern engine that would only be slightly better anyway.

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