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Old 29 November 2013, 05:16   #1
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Yammy F115 and 120 ltr fuel tank - range?

Hi all,

I have just seen in another thread that someone is concerned that a 150 ltr tank will not get him across the channel for the D-Day RIB Raid and it got me thinking.......

I know all boats are different, but does anyone have a rough idea as to the range of a Yammy F115 4-stroke with 120 ltr fuel tank on a 6m Ribeye at a cruising speed of around the same as the guys intend to cross the channel at (say around 20 knots)?

I haven't had the boat out enough yet to get an idea for fuel consumption but would fancy a jaunt over the channel if it would be a doable thing.

Thank in advance!
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Old 29 November 2013, 08:36   #2
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I would guess at around 80 nm, based on 1.25 to 1.5l per nautical mile .

Why don't you fill the tank, and next time you use the boat refill at the end of the day. If you record the distance travelled during that day its an easy calculation to work out lites per nm. Bear in mind rough seas will increase your consumption.

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Old 29 November 2013, 08:42   #3
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This may or may not help you but same engine completely different set up though. My last RIB was a 7.2m with twin Yamaha F115.

Heavier boat and two engines running, the following graph was compiled. Figures recorded using a fuel meter built into the fuel line on one engine only, therefore the figures are for one engine only but both running.
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Old 29 November 2013, 08:42   #4
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Sounds like a plan! Thanks for that, I'll give it a go.

As I get more used to what the boat does I'll get used to it's performance, but for now I don't have enough experience, and I seem to get good answers from this site - it's hard trying to fit boating hours in with a wife, two young boys, four dogs and my rugby refereeing!
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Old 29 November 2013, 08:46   #5
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Thanks Landlord, that looks a good starting point!

I would guess a smaller boat with only one engine would put it around the same mark - give or take a couple of litres per hour.
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Old 29 November 2013, 09:32   #6
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I had the same engine on my old Ribcraft 5.85 so similar size to your Ribeye.

Landlords data looks pretty much the same as what I would have expected with the single engine on a 6m boat. The mid range Yammies are very economical at a modest cruising speed so 120 miles should be feasible in fair conditions.
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Old 29 November 2013, 11:08   #7
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Same rib and engin, from the Needles to Cherbourg trip

"Did 160 miles and used 170lt, 50lt from the needles on the way out and about 80lt back to the needles launched at the Hamble.
Fuel consumption went up big time Sunday for me."

And fron going round IOW in the summer

"Only just filled up with fuel and used 51 lt for the 61 miles, not bad!"

To sum up in good weather under 1lt per mile raising 1.22 in really bad condition you shouldn't be in

Mine only has a 90lt tank and I have fitted 2 X 25lt tanks under the back seat.
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Old 29 November 2013, 11:38   #8
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Cheers Nick, that sounds a bit more reassuring. So 120lt should (theoretically) get me across to France if I cruise at reasonable pace then?

However, I haven't actually checked what size the tank it is - I just assumed it was a standard 120 lt tank as that's what I was told by the broker, and also what I saw on the Ribeye website as the tank fitted to all 600s. I think I might need to to a bit more investigation before I assume it is 120 lt then!
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Old 29 November 2013, 11:48   #9
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I've just phoned Ribeye and spoken to a very helpful lady there, it is indeed a 90lt tank that would be fitted to a 2003 model as they have only recently started putting the 120lt tanks in.

So I think I'd need to work out whether 90 lt would get me there - think I'll need some jerry cans!
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Old 29 November 2013, 12:44   #10
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Ovey, same trip over to Cherbourg as Nick...

Yamaha 250 on an osprey Vipermax 7m

Outbound trip from the Needles I used 85 litres

Return on the Sunday used 98 litres

Don't ask what our steady cruise speed was - it ranged from 7 to 27 knots


A 115 should make it comfortably on a 90 litre tank in good weather at a sensible cruise speed from The Needles to Cherbourg but take spare fuel.
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