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Old 07 May 2004, 08:26   #41
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Country: France
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Fuel Economy

RICHARD TO ANSWER TO YOU .IN FACT THERE IS A SUSUKI DEALER AT LE PALAIS WICH EXPLAIN ON THE SMALLBOATS. The yamaha has the best reputation in france ;people hardly know the optimax except on the big speeding boats
and now knowing that i am around on my boat approx.250 to 300 hours a year i am reconsidering my position
speed is not my priority, i would like to be able to cruise wth the boat around 30 knwith fuel efficiency
doesit make sense to you having a mercruiser 1.7 dti on a solent 6.5
i have been told these unit fitted like that could reach 38 kn using 2 to 3 gal/hour
if it is really like that does not need to be called Einstein to realised the economy;once you have paid the extracost of purchasing it
will be a big difference in term of acceleration
thanks
by the way are you going to be aruond for ribex?
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Old 07 May 2004, 08:40   #42
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It looks like this is becoming a 2s vs 4s vs Diesel thread!!!

Sea bass, i've been down the diesel route, assuming it cost's £10k more to purchase the boat (quite realistic) my calculations show you would need to do 20,000 miles before it paid for it's self in the fuel savings. Of course the boat will be worth more when you come to sell it.

If you say 300 hrs a year, say thats 5000miles the diesel RIB will still only have saved you £3,000 in fuel. The alternative petrol boat would have been more fun (this may not interest you).

The one further advantage (this is a big one if you cruise a lot) is availability.

Rick, i can host the files somewhere if you e-mail them to me, although i am sure John could put them in the download section if you asked him.
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Old 07 May 2004, 08:56   #43
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38kts for a 6.5m RIB with 120hp sounds optimistic, best to check that with someone who's got a Mercruiser 120 installed.

Yes - we'll be at RIBex and so will a lot of other people from the forum. We're staying in Cowes all weekend.

If you're coming over, then it will be an ideal opportunity to look at RIBs. There are quite a number of manufacturers who now fit the Mercruiser 120 such as Parker, Ribcraft and Solent.

If you're coming over let us know your travel arrangements.

What's the price of diesel in France for leisure use? I noticed that there are two quayside pumps in Le Palais - one with a small nozzle which was much more expensive than the one with the enormous nozzle.
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Old 07 May 2004, 09:19   #44
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Quote:
Originally Posted by Richard B
38kts for a 6.5m RIB with 120hp sounds optimistic, best to check that with someone who's got a Mercruiser 120 installed.
Richard!
My GPS shows just under 31kts on my 6.5m with a 90hp so I would have thought that 120hp should easily do that or am I missing a point?
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Old 07 May 2004, 09:21   #45
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No, you're not missing the point at all. I was just playing devil's advocate to get a bit of input.
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Old 07 May 2004, 09:22   #46
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Errm should think the extra weight of diesel engine plus engine box etc would offset the extra HP. Proof of the pudding is in those with 6m/1.7 Diesel boats such as Andre and Mike C who get around 30kts in real life. Suspect 38kts is a tad optimistic!
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Old 07 May 2004, 09:26   #47
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diesel

simmons0 mentioned those figures to me coming out from lee Fairweather i assumed somebody from solent
for belleile a liter of diesel i going to cost you about 60 pence in fact the big hose you have seen is for professional fishermen
the extracost for purchasing is about 3500 sterlings
not too bad!
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Old 07 May 2004, 11:31   #48
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how this subject always sparks a long thread!!

a local yamy dealer tried to sum up my similar 2 v 4 question only last week, this is his experienced opinion on yamaha engines only

he said it depends very much on size of engine, upto 150hp a 4 is approx 30 40% more fuel efficeint but have a detectable power loss, over 150 and especially over 200hp a 4 is only 15% more fuel efficient but he believes the power difference is almost insignificant.

My question would be as im shopping for a 200hp unit at the mo is what about oil consumption on a 2 or opti in particular?? my mates evinrude seems to always need oil??

smart guages are cool, dts, and 3yr warranty, hondas five but you get sod all with em suzis a 250 corrr or shall i wait for verrado... decisions decisions
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Old 07 May 2004, 12:00   #49
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Quote:
38kts for a 6.5m RIB with 120hp sounds optimistic
Ive been told by Lee that his 6.5m will touch 38knots and mine is expected to exceed 40 knots with a 23inch pitch prop.
Remembering the 6m tohatsu will do 50mph with a 90hp outboard its all reasonable.
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Old 07 May 2004, 12:12   #50
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Quote:
Originally Posted by simmons0
Remembering the 6m tohatsu will do 50mph with a 90hp outboard...
You're saying the 6m does 43.4kts with a 90?
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