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Old 23 September 2005, 05:06   #11
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Quote:
Originally Posted by codprawn
Actually that isn't that good - the Quinquari humbers with 2x Evinrude 250s do about the same - the ONLY real advantages are the cost and availability of diesel - but they are BIG adavantages!!!
Yeah and if you read the article again he also states that consumption varies by operator.
Andy
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Old 23 September 2005, 05:10   #12
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Just an observation - not much to back it up - but I was talking to the owner/operator of one of the 10m Humbers earlier in the summer - who were refuelling after 2 hours of running. Not sure what sort of mileage they cover, and at what sort of speeds - but they emptied a lot (8+) big jerry cans into the fuel tank. If that was just for 2 hours, I doubt that they are getting 1.1 nm/l. As I said - just an observation.

I've been running my RIB commercially all summer - and keep track of all my fuel - and I've got through 3206l in 204 hours (including some sitting at the quayside waiting/loading) and according to the odometer on the GPS, have travelled 3625 nm - slightly less than 1.2nm/l.

Having said that - a lot of the actual running is at higher than optimum cruising speed - often at or around Max Continuous revs. And I wish my quayside diesel was as cheap as JWs!!

Dylan...
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Old 23 September 2005, 05:29   #13
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if its any use----
my yam 250's use 60liters/hr/engine at 5100 rpm 2400 kgs gros at 55 knts.
measured by a flowscan /and empty-fill up difference at a garage petrol pump.The mimimum made at 2500 rpm and 22 knts came out at 18 liters/hr/engine- same base.

Thee are latest figures +/- 4% error and correct trim in ideal conditions.

jonathan
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Old 23 September 2005, 05:37   #14
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Quote:
Originally Posted by DGR
..... I've got through 3206l ............ according to the odometer on the GPS, have travelled 3625 nm - slightly less than 1.2nm/l.
......
Dylan, I think you’ve done the sum wrong or your distance and fuel figure are the wrong way round Des
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Old 23 September 2005, 05:41   #15
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I've been running my RIB commercially all summer - and keep track of all my fuel - and I've got through 3206l in 204 hours (including some sitting at the quayside waiting/loading) and according to the odometer on the GPS, have travelled 3625 nm - slightly less than 1.2nm/l.

DGR that is 3206/204= 15.71 liters/hr????????????????

CANT BE RIGHT???????????? or a lot of sitting at the docks??

Jonathan
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Old 23 September 2005, 07:35   #16
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Quote:
Originally Posted by Scary Des
Dylan, I think you’ve done the sum wrong or your distance and fuel figure are the wrong way round Des
I think that's right - 3625nm and 3206l is approx 1.2nm/l. Or the other way round is 0.83l/nm.

Quote:
Originally Posted by eupa
DGR that is 3206/204= 15.71 liters/hr????????????????

CANT BE RIGHT???????????? or a lot of sitting at the docks??
Some sitting at quayside (20% max?) rest of the time switched off or driving about. I don't have an accurate figure for time at the quayside - but if I'm not going out again, after the 5 minute cool-down I turn the engine off (and the ignition!!) anyway.

As mentioned previously (on another thread) - I'm getting between 10 and 20 liters/hr (hours measured on the engine/ignition clock) depending on what we are doing.

Dylan...
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Old 23 September 2005, 07:49   #17
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Quote:
Originally Posted by DGR
I think that's right - 3625nm and 3206l is approx 1.2nm/l. Or the other way round is 0.83l/nm.Dylan...
You are doing more miles than ltrs used therefore it is 0.83 which is much better than 1.2 so I’d be happy Des
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Old 23 September 2005, 07:59   #18
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Quote:
Originally Posted by DGR
I think that's right - 3625nm and 3206l is approx 1.2nm/l. Or the other way round is 0.83l/nm.
Des Both these figures mean exactly the same thing and are both correct you should always check what units someone is quoting before telling them that their maths is wrong.

Its like comparing (miles per gallon) with the new eurapean way of measuring cars consumption figures in (litres per 100 kilometers) The first one will have a higher value as you get more efficient and the second one will give a lower value as you get more efficient.

DGR's 1.2 nm/l is a unit that will increase with efficiency but it is exactly the same figure as 0.83l/nm which will decrease with efficiency
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Old 23 September 2005, 07:59   #19
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I am happy!!
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Old 23 September 2005, 08:14   #20
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Don't have a pop at Des.... He's got a screw loose.... and that's official !!
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