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Old 16 November 2002, 07:12   #1
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Fuel Economy

Has anyone got any experience of small sib fuel economy?
Specifically I have a Zodiac 3.1m Fastroller with a Selva 6hp 2-stroke engine and a 12l fuel tank.
With one up and a calm sea, how far do you think this will take me? (No rude comments please!).
The more intelligent and perceptive amongst you may have gathered that this is a "testing shot" question prior to an attempt to cross the Pentland Firth next year-consequently currents are an issue.
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Old 16 November 2002, 07:56   #2
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Are you going to be towed again.......har, har, har ?
(Only joking)
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Old 16 November 2002, 12:50   #3
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Blimey. Well let that be a lesson to you all!
You mention intelligence and perception in one sentance, and you get a reply like that!
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Old 16 November 2002, 13:27   #4
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Hi Brian

We used to have a Caribe 2.8 RIB with a Suzuki 10hp 2 stroke.

We used to go out on Windermere and have a full day of playing, trips to top & bottom of lake, say 20-30 mile in total and still come back with some fuel in a 3.5 gallon tank.

However we always carried a spare gallon !!.

Knows its a bigger engine but also consider it would be at a lower throttle setting for the same speed so may have opperating at a more efficient level.

Think you may have a 6HP WOT most of the time.

Regards Gary
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Old 16 November 2002, 15:52   #5
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Brian,

I've had much the same experience as Garygee... my SIB has been used mostly on the Thames (4kt speed limit) and has hardly used any fuel at all. Sea use has been limited to short trips, and the 18hp 2-stroke has never got through more than half of the 25-litre tankful - but that's not anything like a full day's trip. The spare gallon's never been in any danger of being used. I'll see if I can find any consumption statistics.

Richard.
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Old 16 November 2002, 16:14   #6
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Same here folks, my 15hp when pottering about seems to make more fuel, never mind use it!

I should think that you'll have no bother getting across the Pentland Firth to Scapa beach Brian. We can also carry spare fuel on the boats. I've never had to use my spare fuel yet and I've a 25l tank.

Keith Hart
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Old 16 November 2002, 16:57   #7
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This is the best I could find:

http://www.tohatsu-outboards.com/fuel-consumption.htm

It looks realistic - I reckon that 3hrs use at WOT for my 18 sounds about right. And so for a 2-stroke 6hp, I guess the same by the following estimate:

6hp (4-stroke) @6,000rpm = 2.0 litres/hr. (x2 for 2-stroke)

4.0 litres/hr from a 12 litre tank gives three hours.

Some real world testing needed, I reckon!
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Old 17 November 2002, 04:52   #8
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Thanks everybody. That is really helpfull and has put my mind at rest.
So if I said 3 hours at 8-10knots, and then only planned to go 20 nmiles, this should be OK shouldn't it?
PS Not sure that I will do WOT in a 3.1m in the Pentland Firth though!!
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Old 17 November 2002, 06:16   #9
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You're welcome
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Old 17 November 2002, 06:21   #10
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Quote:
Originally posted by Brian
this should be OK shouldn't it?
"famous last words"

Isn't there supposed to be a support boat? If so, then if said boat had jerrycans of petrol and 2-str oil (and perhaps Wavehumper's siphoning gadget) then passing one's depleted SIB fuel tank up to the support boat for re-filling should be a reasonably safe procedure - sea state permitting!
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