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Old 18 January 2005, 18:49   #11
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Quote:
Originally Posted by quinquarimarine
We are consigning 20 plus of the 200hps ETECS and the ones fitted so far are superb.
John
www.quinquari.co.uk
John,

I know horses for courses what kinda fuel figures are ya getting per kmile.

have placed an order for one

Paul
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Old 19 January 2005, 16:15   #12
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Quote:
Originally Posted by jackeen
John,

I know horses for courses what kinda fuel figures are ya getting per kmile.

have placed an order for one

Paul

Paul the figures that we quote normally raise an eyebrow and clients querry whether we mean consumption per engine rather than the boat in total. However these figures are based on many years experience with DI and now the ETECs.

When we do get a customer who is still not convinced then we show them our fuel duty claims ...... the best way to assure as if we were using more fuel we would certainly claim the duty !!

Anyhow. ... the figures

on a 10m RHIB with twin 200s (one counter rot), vsl weight with equipment 2200kgs, 12 pax plus 2 crew takes it to approx 3500kgs.

Average sailing is 20% at 75% throttle, 40% mid range and balance low range & tickover. Max speed capable speed 54 knots, average speed over the hour 25 knots thus 25 nm in one hour.

Total consumption = 5 gallons per hour ie. 2.5 galls per engine bearing in mind that that is transporting a total laod of 3500kgs.

Now if we fit 150ies to the same boat cons. is same.

On longer offshore runs cuising at say 35knots consumption increases in total by about 1/2 gall.

We put the light consumption relative to load down to the efficiency of the hull and engines but critically we weigh all components before fitting and strive to achieve correct balance of the vsl. In particular we prefer a static hull to be slightly heavier on the bow (achieved by moving underdeck tanks forward) so that the bow does not rise to quickly/high and you need to increase power and trim to get the bow down ie. let gravity bring the bow down.

Thus I guess the moral is that having the most efficent engine around does not mean it will be efficient unless it is operated efficiently.

We have just fitted two vessels with 250ies and are expecting same figures but will report following tests.

Cheers

J
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Old 19 January 2005, 16:55   #13
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Country: UK - England
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Many thanks for the detailed reply John.

So 2.5 gals = 13 ltrs apx for 25 nm = 2 nm a ltr apx for light cruising

Whow thats stunning

Interesting your insight into weight towards the bow when static . I wonder how many are set up that way ??? not many I would speculate 1!!!!

Thanks again

paul
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Old 20 January 2005, 10:31   #14
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[QUOTE=The Jackeens] Many thanks for the detailed reply John.

So 2.5 gals = 13 ltrs apx for 25 nm = 2 nm a ltr apx for light cruising

Whow thats stunning


this is really low! how much rev's are you turning at 25 nm and 35 nm???
I hope Iíll obtain more or less the same results once Iíll have my etec. In order to obtain a better balance mine will have a ballast tank in the bow.
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Old 20 January 2005, 11:03   #15
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Quote:
Originally Posted by The Jackeens

So 2.5 gals = 13 ltrs apx for 25 nm = 2 nm a ltr apx for light cruising

Whow thats stunning

Thanks again

paul
It might be even more stunning actually - I thought it was 4.5 litres to the gallon which means - 2.5 X 4.5 = 11.25 litres for 25nm = 2.22 nm per litre! Apologies if I have the conversion wrong Paul!
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Old 20 January 2005, 11:21   #16
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Quote:
Originally Posted by The Jackeens
So 2.5 gals = 13 ltrs apx for 25 nm = 2 nm a ltr apx for light cruising
Cookee you are correct;

2.5 gallon [UK] = 11.37 litrs -> 2.2nm/l

Blimey!
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Old 20 January 2005, 12:18   #17
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Yep Lads you are correct,

i was just rounding up, for simplicity. General rule of tumb.

Too much hassle to get a calculator out

Paul
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Old 20 January 2005, 17:57   #18
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[QUOTE=Seaharrier]
Quote:
Originally Posted by The Jackeens
Many thanks for the detailed reply John.

So 2.5 gals = 13 ltrs apx for 25 nm = 2 nm a ltr apx for light cruising

Whow thats stunning


this is really low! how much rev's are you turning at 25 nm and 35 nm???
I hope Iíll obtain more or less the same results once Iíll have my etec. In order to obtain a better balance mine will have a ballast tank in the bow.
Paul,

For 35 knots about 4500rpm and 25 then 3800rpm. That is based on a full load of 12 pax plus 2 crew plus 400kg fuel on a 10m.

A couple of points to be fair.

1. I comented in my last e-mail about balancing the boat. We find this critical but it is far easier to balance a 10m with bodies on board than say a 6m. Thus we take our hat of to those that achieve balance on say a 5m.

2.We operate mainly at medium revs, rely on twins that are set at critical cls for our set up, prop well and use counter rots.

Thus again I say the ETECs and DIs, Suzis and the Yams have superb consumption but the set up and operation of the boat is equal in the effiency equation.

Cheers

John
www.quinquari.co.uk
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