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Old 30 June 2009, 11:15   #231
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Originally Posted by Mick Balch View Post
Ditto the above - Good fun with a good bunch of folk.

Optimax control registers total Journey - 218 miles - used 228 litres. Seems about right?
Northney Hayling to Alderney via Needles.

Definatley used more fuel going than coming back? Rapid happily glugged the extra 75 litres I took over with me but was full after 60 litres when I got back.
Hi Mike
Just checked my Chart plotter and total miles covered
Northney Chi Bar to Needles on to Alderney back Via going under Hayling Bridge
188 miles fuel used 260 lts approx 1.4 lts to the mile
i am compleaty amazed but we did stick to approx 4500 rpm = about 35 kts on the way back, and of course we where very slow in the fog going out
just shows what WOT dose to your walet
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Old 30 June 2009, 13:20   #232
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Hi Guys.....

It looks like you all had a great time. I hope you don't mind me joining in this thread. I know I didn't go with you but its of interest since I did practically the same trip a few days before.

I was particularly interested in the fuel consumption you experienced, (jet skis too for interest.) The reason is that, though I’m not planning to change boats particularly soon, I am wondering if, after 8 years of enjoying duty free diesel, I might go back to petrol for my next boat.

However, with the figures some people have mentioned so far, I think I might stay with diesel. I’m still running the Merc 1.7 ltr, (120hp), so it’s not that fast…. But it is very economical.

Did anyone do the trip in a 6-7 mtr boat with about a 175 on the back? That might be what I may get next – maybe.

My trip went from Lymington to Alderney and return by the way. I’m happy to publish my fuel figures if anyone wants to know…. But you won’t like it.

Mike C
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Old 30 June 2009, 13:45   #233
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237 litres running twin volvo d3 135hp pretty good I thought .
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Old 30 June 2009, 13:49   #234
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Publish and be damned, I say!

....and if you do, I'll tell you what Ginger Crew (Sunseeker 10m+) put in at Alderney (although I don't know that he started out with a full tank).

With my consumption being 191 litres from a 225 litre tank, that nearly gives me the 1/3 recommended reserve to be able to do the return trip without refuelling.

I'd also mention that I take pleasure in the thought that, in the conditions that we had on the way back, I could when chasing the floptilla keep up with Banshee (250hp jetski) (although I concede that in the flat, he'd leave me standing!)
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Old 30 June 2009, 14:00   #235
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Although maybe not helpful as a direct comparison, we covered 77 nautical miles (over the ground) on about 85 litres of juice from Jersey to Alderney return. We had a few knots of tide against us in both directions, whereas the 'floptilla' would have been with the tide to some extent, or at least a cross tide. Most of our trip was around 4,000 rpm approx 30-34kts.

Keith
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Old 30 June 2009, 14:02   #236
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From Yarmouth - Braye, we used 60% of our 90 ltr tank, so approximatley 54 ltr.

Andy
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Old 30 June 2009, 14:05   #237
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Although maybe not helpful as a direct comparison...
Keith, the best way to offer a more effective comparison is to do the run in reverse.

Friday night in Alderney, on to Cowes on the Sat for a BBQ and half a lager shandy before choir practice. (That is what happened last weekend isn't it?).

Obviously all in the name of science and fuel economy. What do you reckon?

Are there any RIB.netters in sunny Guern?
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Old 30 June 2009, 14:11   #238
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Friday night in Alderney, on to Cowes on the Sat for a BBQ. (That is what happened last weekend isn't it?).
Just make sure that you go to Cowes via the Fairway Buoy, rather than via St Catherines!
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Old 30 June 2009, 14:15   #239
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Floptilla 2010

A couple of things that I though may be improvements for next year:

1. I would have liked to have done a raft-up for 10 mins mid-channel for a natter, a bite to eat, and a photo op.

2. Should we extend the stay in Alderney to 2 nights?

Andy
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Old 30 June 2009, 14:22   #240
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OK then..... I thought you'd never ask.

Seriously, I really AM more interested in what a 175 hp on a 6.5 mtr boat would run…

Anyway, here goes…. And this was even less than I expected…. But it’s what it is!

The tank was filled to the brim on departure, (Officially it’s a 130 ltr tank but it will actually take more like 150 to the brim). This was with white diesel with the boat on the trailer in a petrol station as its now cheaper than most marinas red stuff at duty paid prices.

From the GPS, the trip to Alderney from Lymington, (With a short detour via the Ortac Channel as I’d never been through it), was 76 N Miles, - 4.33 hours. I took on 33 litres of Maynbrace duty free red diesel in Alderney, (though at the time some of it went into a can as I my tank was frothing a bit). Anyway, 33 litres went on board for the return. Alderney to Lymington the next day was 68.2 N miles - 4.12 hours. Average speed for the trip out, (including a 5 minute stop to look at some dolphins was 18 knots – this includes the slow bit up the river) Average speed for the trip back in slightly rougher seas was 17 knots.

Yesterday I filled the tank back up to the brim with white diesel. It took 65.3 litres. That's a total refill for the whole trip of 98.3 litres. Total millage 144.2.

Fuel consumption 0.68 litres per mile. About 16 litres per hour at (mainly) 22 knots.

Now as I say, I really don’t want to gloat or anything…. Having said that, please check my maths

Please, anyone with a 175 ish petrol lump? What did you do?

Mike C
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