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24 August 2018, 17:52
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#21
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Member
Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
Join Date: May 2004
Posts: 2,893
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220l - 200hp. Interesting observation but surely a sign of an idle mind!
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24 August 2018, 18:21
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#22
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Member
Country: UK - England
Town: suffolk
Boat name: not yet
Make: Gemini + XS
Length: 5m +
Engine: Suzuki 140/merc 60
Join Date: Jan 2015
Posts: 1,299
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115 hp (max rated150) .......246litres. florida built ,petrol must be cheaper there .
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24 August 2018, 21:31
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#23
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Member
Country: UK - England
Town: Waterlooville
Boat name: Tickler
Make: Halmatic P22
Length: 6m +
Engine: Inboard Diesel 240HP
MMSI: 235115642
Join Date: Sep 2015
Posts: 1,777
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Pac 22
At build - 140hp 90 litres
Now - 240hp 150 litres
Whilst there is a correlation - bigger engine = more fuel, I'd say there are probably a few factors that influence it - purpose for example - daughter craft = 0.5 * power, recreational = 1.0 * power, SAR = 1.5 * power. Geographic area might have an influence.
It would be quite an interesting exercise to do.
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24 August 2018, 22:39
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#24
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Member
Country: UK - Scotland
Town: denny
Boat name: breezy
Make: northcraft
Length: 6m +
Engine: honda 150
Join Date: May 2016
Posts: 888
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150hp just removed the old 90litre tank
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24 August 2018, 23:43
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#25
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,646
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53 litres and 70hp. I cry a little when I fill it. 
Those with 200 litres+... I'd need a crash team on the forecourt during a fuel top up!
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Is that with or without VAT?
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24 August 2018, 23:57
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#26
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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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Quote:
Originally Posted by spartacus
53 litres and 70hp. I cry a little when I fill it.
Those with 200 litres+... I'd need a crash team on the forecourt during a fuel top up! |
The first time I filled mine up on a forecourt from empty a woman was complaining to the cashier about me blocking 2 pumps.
The cashier said 'He can do what he wants, he's just bought more fuel than the last 10 cars.' 
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25 August 2018, 00:06
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#27
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RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,899
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Quote:
Originally Posted by Erin
Interesting observation but surely a sign of an idle mind!
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Absolutely. I just hit on the notion the other day. It was something Nos said that piqued my interest. I think, for RIBs, that's it a happy co-incidence. It won't apply to Diesel rigs or Special purpose craft. But it's there or thereabouts for most petrol RIBs...
I suspect.
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25 August 2018, 09:33
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#28
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Member
Country: UK - England
Town: Chesterfield
Boat name: Sea Quell
Make: Picton Cobra
Length: 5m +
Engine: Mercury 150 4 Stroke
MMSI: 235038298
Join Date: Sep 2003
Posts: 1,095
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180ltrs 150hp 4S [emoji106]
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25 August 2018, 13:30
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#29
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 2,000
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90l v.140HP - the exception that proves the rule!
Still good range - 120NM. 
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Member of the Macmillan Round the Isle of Wight Club
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25 August 2018, 20:17
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#30
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Member
Country: UK - England
Town: Kent and Suffolk UK
Boat name: AlphaFox
Make: Atlantic
Length: 7m +
Engine: 2 O/B Suzuki DF90ATL
MMSI: 232012141
Join Date: Aug 2016
Posts: 41
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When the Fox was in service (as it were) she had 2x75's v.s 2x81 litre tanks
it closer now i have upped the HP to 90's - perhaps subconsciously i was thinking the same thing when i bought them...
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25 August 2018, 20:21
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#31
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Member
Country: UK - England
Town: Kent and Suffolk UK
Boat name: AlphaFox
Make: Atlantic
Length: 7m +
Engine: 2 O/B Suzuki DF90ATL
MMSI: 232012141
Join Date: Aug 2016
Posts: 41
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...and as for the forecourt gag - the other week i was asked to hurry up (in Mallaig) as he wanted to close up at 2.00pm for the (Saturday) afternoon. Half the problem is his pumps won't let you put more than £100 in at a time. Nice bloke but he knows he has a monopoly...
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26 August 2018, 15:44
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#32
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 2,000
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Wet Sunday afternoon task - shows how bored I am unable to rib - tipping with rain and have snapped bicep tendon (ouch).
Wilk rule of thumb 2 seems pretty accurate on the 32 rib sample on this thread....Fuel tank size in litres is 0.92 of associated Engine HP.
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Member of the Macmillan Round the Isle of Wight Club
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26 August 2018, 19:41
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#33
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Member
Country: UK - England
Town: penzance
Boat name: not named
Make: ski boat
Length: 5m +
Engine: 150 HPDI
Join Date: Sep 2013
Posts: 224
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Even if I did that maths I'm not sure I'd admit to it.
BTW, what was the Standard Deviation?
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27 August 2018, 00:41
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#34
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RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,899
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Quote:
Originally Posted by lakelandterrier
Wilk rule of thumb 2 seems pretty accurate on the 32 rib sample on this thread....
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Why thank you Mister Terrier. The willkcraft is 450L/370hp - but then, she's rated for 500hp.....
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27 August 2018, 00:42
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#35
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RIBnet admin team
Country: Ireland
Length: 4m +
Join Date: Feb 2008
Posts: 14,899
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Quote:
Originally Posted by Poly
What was Law#1 though?
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Same as Pikey Dave's
His might be a Rule. Then again, mine is more of a Guideline... 
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27 August 2018, 10:23
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#36
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Member
Country: UK - England
Town: Kent and Suffolk UK
Boat name: AlphaFox
Make: Atlantic
Length: 7m +
Engine: 2 O/B Suzuki DF90ATL
MMSI: 232012141
Join Date: Aug 2016
Posts: 41
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Mr Willk could you please advise the propulsion on the Willkcraft? Single or double diesels into stern drives or more exotic??
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27 August 2018, 10:30
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#37
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Member
Country: UK - England
Town: Gloucester
Boat name: Lunasea
Make: Ribcraft
Length: 5m +
Engine: Suzi 140
MMSI: 232005050
Join Date: Sep 2007
Posts: 2,000
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Graph below - pretty close. left the one obvious outlier Orwell Boy's 245l-115HP in as this is rule of thumb. with that out, it correlation goes up to 0.95.
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Member of the Macmillan Round the Isle of Wight Club
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27 August 2018, 12:52
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#38
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,627
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Quote:
Originally Posted by lakelandterrier
Graph below - pretty close. left the one obvious outlier Orwell Boy's 245l-115HP in as this is rule of thumb. with that out, it correlation goes up to 0.95.
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As with many “laws” I suspect many misunderstood it though. Certainly some of the data points are for the actual HP they have fitted not the maximum outboard HP the hull is rated for as originally proposed!
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27 August 2018, 12:54
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#39
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,627
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Quote:
Originally Posted by 747sp
Mr Willk could you please advise the propulsion on the Willkcraft? Single or double diesels into stern drives or more exotic??
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Since he’s not around - he runs a single diesel through a standard stern drive.
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27 August 2018, 13:21
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#40
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Member
Country: UK - Wales
Town: N Wales Chester
Boat name: Mr Smith
Make: Humber
Length: 6m +
Join Date: Feb 2009
Posts: 5,238
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Quote:
Originally Posted by Poly
As with many “laws” I suspect many misunderstood it though. Certainly some of the data points are for the actual HP they have fitted not the maximum outboard HP the hull is rated for as originally proposed!
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I think you’ll find it was “recommended” petrol HP
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Tickler
breezy
Sula
White Noise
