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Old 06 September 2001, 16:09   #21
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On optimaxes........

Our new 150 Opti on Yellowtang is blistering quick on acceleration. I damn near pulled a friends arms out of their sockets when towing a skier a few weeks ago! Its also very economic at cruising revs (say 4000-4500rpm) compared to the Johnson 150 it replaced. Open the throttle wide and its just as thirsty. Worse still the Merc "Smartcraft" gauges (again excellent bit of kit) tell you EXACTLY how many litres per hour you are burning. 56lph @ WOT if I recall correctly.

Perhaps a diesel is best after all!

Alan
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Old 07 September 2001, 03:36   #22
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Alan,

56 lph @ WOT give at least 56 knots or not ? Cause if they do, the moror IS economic.

Michael
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Old 07 September 2001, 07:51   #23
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WOT

Me being thicker than most snails, what does WOT mean.

I have seen it a few times and never managed to work out what it could stand for.
Can anyone tell me.

Thanks Gary
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Old 07 September 2001, 08:58   #24
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Hi,

WOT = Wide Open Throttle

Regards

Steve
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Old 09 September 2001, 10:20   #25
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Petrol vs Diesels

As our illustrious moderator and administrator rightly points out, petrol is only around 40p a litre in the Channel Islands! But, diesel, again is cheaper than this, 34p a litre, I think? I still am not convinced that a diesel engine will out- perform an outboard on sheer performance, particularly for water-skiing. Since I always seem to have half the island on my boat and a 'bath-plug' type rugby lock person hanging at the end of my ski-rope on a mono-ski, I sincerely doubt if any diesel engine inboard will have the gruntish acceleration to pull this guy out! What do you reckon?
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Old 09 September 2001, 13:17   #26
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Michael,

56mph? I wish. Full speed is about 43kts. Bizzarely enough the boat seems to perform better with 6 people onboard that just one!! I reckon to around a litre a mile fuel consumption at cruise. The good thing with these whizzy smartgauges is that in theory by looking at fuel consumption/mpg figures you can set your most economic cruising speed. The bad thing is trying to read them whilst doing 30kts in a chop!!

Stealth,

I think for watersports use and "holeshot" performance as the Yanks say you can't beat an outboard - 2 stroke for preference. Of course in the land of cheap petrol you could go for a big block V8 petrol engine - say 500hp!!! The other thing might be to go for a smaller pitch prop for acceleration rather than top speed.

Cheers,
Alan
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Old 10 September 2001, 01:22   #27
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Optimax

Alan,
Not particularly cheap when cruising as I understand it, considering the size of the rib. If I may translate the figures the Opti will drink 1,3 l per mile at WOT. And that is 12 - 15% less than the old fashioned 2 stroke.
Am I right or not ?

Michael
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Old 25 September 2001, 12:40   #28
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There's an article about Humber Ribs and a very short review of my boat in this months Sportsboat and Rib magazine.

It's a shame that they barely mention the diesel engine considering that they were there for an entire day and the article was supposed to be as much about the engine as the boat.
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