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Old 13 January 2009, 08:49   #11
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8.5

8.5 Humber with KAD44 duoprop about 1lt per mile at 3000 rpm which is about 24 kn.
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Old 13 January 2009, 09:36   #12
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I run two 115 outboards on a 6.7m rib, the Arctic is pretty heavy and we usually have six divers with kit on board. We average about 12-14 gallons an hour running at 35 knots, I make that 1.5 - 1.8 L/mile.
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Old 13 January 2009, 10:58   #13
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Quote:
Originally Posted by Ashton View Post
Does anyone have any fuel consumption comparisons on single or twin outboards v's inboard diesel.

I am considering twin 150 or 225hp outboards (perhaps four stroke) v's a single diesel sterndrive on an 8.5 m rib.

The rib will be coded and used commercially, thereore I'd be in a position to claim the duty back on the fuel.

Any other thoughts would be appreciated.
Ashton

Have you a rib in mind cos we would be interested in making you an offer
for a brand new Parker 9 mtr single diesel

we have twin diesel and single diesel 9 mtr Parker ribs coded and used commercially in the UK
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Old 13 January 2009, 17:00   #14
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Make: XS850
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I currently own an 8.5m XS with twin 200 Verados. With four on board, a half tank of fuel (300 litres) and smooth seas my total fuel burn is about 58 litres/hour at 30 knots.

My last boat was an 8.5m Tornado with a 250hp Yanmar diesel coupled to a Bravo X drive. With four on board, a full tank of fuel (180 litres) and smooth seas my fuel burn was about 27 litres/hour at 30 knots.

So for a private user the twin outboard RIB fuels costs are almost doubled.

However, when running commercially the difference in fuel burn is not as significant as it might first appear, because most of the duty is reclaimed.

My commercial skippering is mainly on 10m Humbers with twin 200hp ETECs (80 litres/hour at 28 knots with 13 on board), but I do sometimes skipper an 11m cabin Redbay with twin 245hp Yamaha Hydradrives (about 50 lires/hour at 28 knots with 14 on board).

In Scotland finding petrol is always an issue, whereas diesel is available almost everywhere, so in terms of flexibility and long distance cruising, diesel wins hands down. However, diesel reliability can be an issue, I certainly had my own fair share of problems, all related to the engine legs. Servicing can also be quite expensive, but probably not significantly more than servicing two petrol outboards.

I love the handling characteristics and the reliability that a twin rig offers, so I do prefer the twin petrol outboard RIB to the single inboard diesel. A twin diesel also offers all of these advantages, but in my own opinion you need a minimum of a 10m hull to handle all this eatra weight.
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Old 14 January 2009, 03:58   #15
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I currently own an 8.5m XS with twin 200 Verados. .
And what a beauty it is
Andy
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Old 14 January 2009, 14:04   #16
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Old 15 January 2009, 06:35   #17
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Nope, I don't. Purchase price of diesel varies daily. For commercial use the duty is 10.07p and vat is 5%. Today it was 36p/lt +vat here. For leisure use it would be the 36p + 42.28 duty + Vat.
But, looking at your profile, I presume you know all this.
sorry jw! little lost! how much does it cost private?
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Old 17 January 2009, 19:14   #18
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sorry jw! little lost! how much does it cost private?
OK, the rate of duty for leisure use is 52.25p/lt. The rate of duty for commercial use is 10.07p/lt. 5% vat is payable on the total in each case.

For an easy example let's take the diesel cost as 50p/lt.
for commercial use: 50 + 10.07 x 1.05 (5% vat) = 63.07p/lt
for leisure use: 50 + 52.25 x 1.05 = 107.36p/t

However, if you are buying at a marine pump the price quoted will normally contain the 10.07p/lt commercial duty so you only have to add on 42.28p duty to get the leisure rate. Then add the 5% vat, of course.

Apologies for the confusion.
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