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Old 28 March 2009, 08:24   #1
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guesstimate fuel

How many Nautical miles would you guesstimate an old 115hp V4 would get out of 50 litres at cruising speed?
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Old 28 March 2009, 08:58   #2
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Roughly 25 miles if your burning 11 gallons an hour which works out at roughly 50 litres per hour.
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Old 28 March 2009, 09:15   #3
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Quote:
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Roughly 25 miles if your burning 11 gallons an hour which works out at roughly 50 litres per hour.
I would hope more than that... most folk reckon on 1 US gallon (3.8 L) for every 10 HP on an old tech engine at Wide Open Throttle.

So 11.5 US gal per hour at WOT.
= 43.7 L/hr
So 50 L would last about 70 mins

At WOT I am guessing JSP will be doing 35 knots ? - So Would expect around 40 nm.

At cruising speed possibly a bit better.
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Old 28 March 2009, 09:25   #4
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Yes id say more like 35-40 miles. So 0.7 - 0.8 miles per litre.

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Old 28 March 2009, 09:50   #5
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I'd say try it and find out. There's too many variables for a safe guesstimate unless you actually own the boat...
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Old 28 March 2009, 10:10   #6
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Didn't realise it was US gallons.

Are you running 2 25 litre tanks? Just see how far you get on one and double it.
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Old 28 March 2009, 10:28   #7
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Yeah 2X25L tanks.
Just trying to work a rough guess.
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Old 28 March 2009, 11:45   #8
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My V4 Soozook DT100 burns around 1 litre/nm at cruising speed (28ish kts) on a similar size boat. Your Yam may be a touch thirstier, but there shouldn't be much in it.
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Old 28 March 2009, 12:14   #9
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My V4 Soozook DT100 burns around 1 litre/nm at cruising speed (28ish kts) on a similar size boat. Your Yam may be a touch thirstier, but there shouldn't be much in it.
So going off that and Polwarts sums I should take it at about 35nm on the safe side from a 50L tank. I've only pished about in it so far, thinking of taking it from Preston to Fleetwood which is around 25 nm. If I work off that to start with and then I can see what I actually get. And if it seems to be using more I've got a couple of options to get fuel.
Cheers lads
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Old 28 March 2009, 15:40   #10
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we used to say as a rule of thumb a third of the horse power in litres per hour st wide open throttle WARNING nobody can give you an accurate answer to this question as weather condition , boat , boat load there is a lot of factors to put into the equation
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