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02 April 2012, 10:23
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#1
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Member
Country: New Zealand
Length: 3m +
Join Date: Nov 2011
Posts: 22
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Fuel economy
Has anyone got any figures on the fuel economy of a 3.80m inflatable with a 30hp 2 stroke? Im thinking a 23 litre tank should be good for atleast 40 miles travelling fairly swift on calm sea.
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02 April 2012, 11:36
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#2
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Member
Country: UK - England
Town: Blakeney
Boat name: Lindy
Make: Avon
Length: 3m +
Engine: Tohatsu 9.8
Join Date: Dec 2008
Posts: 101
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Fuel Economy.
Generally, you are looking at 1 gallon per 10 hp per hour. This is for 2 strokes only. I've found it to be more or less true. Hope it helps.
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02 April 2012, 11:44
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#3
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Member
Country: New Zealand
Length: 3m +
Join Date: Nov 2011
Posts: 22
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Would that be 10hp in use eg. my motor at 1/3 power or simply a 10hp motor?
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02 April 2012, 18:50
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#4
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Member
Country: UK - England
Make: Zodiac
Length: 3m +
Engine: 9.9 Hosses!
Join Date: Aug 2011
Posts: 47
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Although only from its one use yesterday mine used about 1 gallon, that was about 90 minutes or so of messing around so not at WOT much of the time, it also made me realise that the fuel gauge on my tank doesnt work! oh its a 9.9hp!
Nick
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02 April 2012, 19:01
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#5
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Member
Country: UK - England
Town: Sussex
Make: Ceasar Surfcat
Length: 4m +
Engine: Tohatsu 50hp
Join Date: May 2006
Posts: 105
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Id say you'd easily get 40 miles out of that if youre not carrying much weight. I was allways amazed by the economy of my Aerotec 380 with a 30 on the back.If I wanted to get somewhere quick, I found the economy would be great if i opened the throttle fully then backed it off slightly but still maintained a decent speed and was kind to the engine.
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02 April 2012, 19:20
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#6
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Member
Country: UK - England
Town: Blakeney
Boat name: Lindy
Make: Avon
Length: 3m +
Engine: Tohatsu 9.8
Join Date: Dec 2008
Posts: 101
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A gallon an hour per 10hp is a full chat, but if you're on the plane and you can back off a bit and stay planing, economy is much improved.
I always work on the gal/ hour plan, then I don't have to worry too much on the way home........
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02 April 2012, 19:22
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#7
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Member
Country: UK - England
Town: Blakeney
Boat name: Lindy
Make: Avon
Length: 3m +
Engine: Tohatsu 9.8
Join Date: Dec 2008
Posts: 101
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fuel economy
Sorry, I meant AT full chat, not A !
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09 April 2012, 08:11
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#8
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Member
Country: New Zealand
Length: 3m +
Join Date: Nov 2011
Posts: 22
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Well, we ended up doing atleast 50 miles and used about 20 litres petrol. Thats with 2 of us, camping gear and certainly not trying to be economical. Happy with that.
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09 April 2012, 09:23
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#9
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Member
Country: UK - England
Town: N. Devon
Boat name: (Not Another) Nutkin
Make: Highfield
Length: 6m +
Engine: Outboard, Honda 135
MMSI: 232036183
Join Date: Dec 2008
Posts: 2,046
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I used to love my 3.83 with a 25 on the back - seemed to run on nothing for hours at a time - shame she went else where 
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09 April 2012, 10:45
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#10
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RIBnet admin team
Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
Join Date: Jul 2005
Posts: 13,069
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Actually, it's 1 US gallon per hour (or about 3.8 litres) per 10hp at wide open throttle.
It applies to pretty much every engine.
Four strokes/DI 2 strokes aren't that much more efficient at full throttle but not using them at WOT makes them significantly cheaper to run than a carbed 2 stroke.
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09 April 2012, 17:54
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#11
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Member
Country: USA
Town: Oakland CA
Length: 3m +
Join Date: Feb 2005
Posts: 6,653
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Quote:
Originally Posted by NWC100
it also made me realise that the fuel gauge on my tank doesnt work!
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Haven't seen one yet that works at anything other than a standstill.
jky
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09 April 2012, 22:58
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#13
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Member
Country: UK - England
Town: Plymouth
Length: 6m +
Join Date: Mar 2011
Posts: 2,693
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Interesting to see them suggest that a 30hp 4 stroke will yield just 3 litres per hour less fuel than the equivalent 2 stroke!
Makes you wonder if it's worth the initial investment
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10 April 2012, 11:40
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#14
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Member
Country: UK - England
Town: Dorset & Hants
Boat name: Streaker/Orange
Make: Avon/Ribcraft
Length: 4m +
Engine: 50Yam/25 Mariner
Join Date: Apr 2007
Posts: 5,551
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Quote:
Originally Posted by Boats&Outboards
Makes you wonder if it's worth the initial investment
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This old one again ....I guess thats why on Sat for the mini Sibfest they were all 2 strokes  ( except Davids big 250 suz)
All comes down to smoothness & the govt telling us whats good for us .... 
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