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Old 07 January 2010, 03:56   #1
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One liter per mile - what speed for your RIB?

I think most of us are familiar with the idea that a RIB should be expected to yield 1:1 on passage, ie not at a high speed but a comfortable planing pace.

We have just spent some time tweaking our own 90HP 4/S + 6.25m setup, not sure how much of an improvement has been made yet but 1:1 used to be achieved at around 20kn. (You can see why I felt the need for a tweak.)

So what speed do you get, is 1 liter per mile realistic?
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Old 07 January 2010, 04:01   #2
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1 L per hour? Doesnt sound realistic to me even at idle.
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Old 07 January 2010, 04:06   #3
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1 L per hour? Doesnt sound realistic to me even at idle.
Booger! I meant per mile, d'Oh
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Old 07 January 2010, 04:07   #4
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I think they use a different unit of measurement in Alderney to the rest of us. For example, ask somenone how much they've had to drink, and if they say a pint or two, they actually mean about a gallon
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Old 07 January 2010, 04:10   #5
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I think 1 L per mile is certainly achievable, I was out yesterday & did about 30 miles & used about 25L of fuel, most of the time at about 30kn, all approximations of course. My 90 2 stroke is very economical.
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Old 07 January 2010, 04:10   #6
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i think they use a different unit of measurement in alderney to the rest of us. For example, ask somenone how much they've had to drink, and if they say a pint or two, they actually mean about a gallon :d
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Old 07 January 2010, 04:13   #7
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I think they use a different unit of measurement in Alderney to the rest of us. For example, ask somenone how much they've had to drink, and if they say a pint or two, they actually mean about a gallon
Sound like a "quiet night" in Ireland, ie about 6 to 8 pints!!
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Old 07 January 2010, 04:17   #8
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Sound like a "quiet night" in Ireland, ie about 6 to 8 pints!!
It is not the quantity, it is the way it is measured. "A couple of pints" can mean anything. Time is also a fluid concept round here, days can last weeks and months go on for a lifetime.
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Old 07 January 2010, 04:30   #9
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2 I can remember-

1) 35 (Nautical) Miles, 30L Fuel, 19-20 Knts.
It was an Sr4 / Suz DT25, so not too good a comparison to your 90!

1) 24 (Nautical) Miles, 30L Fuel, Consisting of 1/2 hr pootling about with a lot of stop - go, followed by 20-24 Knts for 20 odd miles, 2 miles of which were at WOT.
That was with an old not particularly well tuned 2-pot Yam 55 Premix on the Humber


There was a thread about fuel consumption, will try to find it later if someone doesnlt get there first.
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Old 07 January 2010, 04:32   #10
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Did a Mylor-Fowey-Mylor flat sea run in the summer...Ribcraft 5.3, Suzuki DF90 (2009 spec 1500cc), 3 up.

Distance travelled: 53.2 imperial miles
Average speed including mooring, tootling around Fowey etc: 19.2mph
Cruising speed at sea: 25mph, give or take
Fuel consumption measured tank full to tank full: 9.13mpg (2.00 miles per litre)

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