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Old 02 May 2006, 10:04   #1
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MMMMmmmmmm what you think?

7.5mtr osprey vipermax
twin 220ltr fuel tanks
twin 200hp etecs both running on own fuel cell,

to heavy on the ass end or not? engines 190kg ea. transom can handle it but not sure how it will land in the ruff stuff off shore.

or do i just go with a single 300hp yam?
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Old 02 May 2006, 10:05   #2
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i was originally thinking 2 x 150 opti but the etec are almost the same weight apparently
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Old 02 May 2006, 10:28   #3
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sounds very awsome and a real speed machine.
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Old 02 May 2006, 11:09   #4
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With twin tanks, console and seatings in the middle it can be a nice setup, the 7,5m Osprey Viper Max has a total lenght of 7,8m.
I have delivered a 7,8m with a 300HPDI with high discovery console and 2 X 2 jockey, single tank 220 liters.
Speed 52 knots.
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Old 02 May 2006, 11:57   #5
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Quote:
Originally Posted by nugent
7.5mtr osprey vipermax
twin 220ltr fuel tanks
twin 200hp etecs both running on own fuel cell,

to heavy on the ass end or not? engines 190kg ea. transom can handle it but not sure how it will land in the ruff stuff off shore.

or do i just go with a single 300hp yam?
If you go for a little bit longer hull (~8 or 8.5m) you will have a nicely set up RIB.
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Old 02 May 2006, 15:22   #6
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Quote:
Originally Posted by Petrov
With twin tanks, console and seatings in the middle it can be a nice setup, the 7,5m Osprey Viper Max has a total lenght of 7,8m.
I have delivered a 7,8m with a 300HPDI with high discovery console and 2 X 2 jockey, single tank 220 liters.
Speed 52 knots.
petrov me old mucka,
as you most likely know from chris this is a genuine purchase, would you go wid twin etecs or the yam route,?wid single tank
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Old 02 May 2006, 16:28   #7
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I have just specced my 8.5, and ended up deciding on a merc 275, instead of two 150 optis. This 2 x spec is for offshore long range stuff. IMHO If u want a fast run, and be able to fly right, without the heavy fuel consumption go for the single 300. I've leapt off many a wave coming at me, and a few have lifted the bow so high , I was glad I had a single when I landed, twins are tools for reliability, maybe speed if the conditions are right, but if you push it, with the xtra tail weight you might regret it, mind you etecs are lighter than optis WOOOHOOO why not
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Old 02 May 2006, 16:30   #8
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I would go for a Suzuki 250 - then trade it up to the 300 next year.

Definitely a single though.
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Old 02 May 2006, 17:03   #9
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Quote:
Originally Posted by nugent
7.5mtr osprey vipermax
twin 220ltr fuel tanks
twin 200hp etecs both running on own fuel cell,

to heavy on the ass end or not? engines 190kg ea. transom can handle it but not sure how it will land in the ruff stuff off shore.

or do i just go with a single 300hp yam?
Much as I love the Etecs, I'd say that twin 200's on a 7.5m would be overkill. I'm also not really sure that I buy into the whole twin engined thing on the grounds of reliability. If you really want to minimise the chances of breakdown you would need to buy the fuel for each tank from two different sources. Is this really logistically possible for you? I'd suggest a big single rig with decent aux as a back up.

The weight issue would also be a concern to me. Most Ribs are inherently bow light & any additional stern weight could cause a few problems when it gets a bit blowy out there.

I think Richard makes a valid point. Why not spend the money a second outboard would cost on a longer hull? I was amazed by the improvement in sea keeping between a 7.5 & 8m version of the same manufacturers hull when we did some evaluations recently.

Good luck anyway

Cheers

Ian
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Old 02 May 2006, 17:18   #10
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i think the fuel consumption would probably horrify you as well, a 7.5m osprey with 400 hp is going to be a bit of a beast and as mentioned earlier probably a bit heavy on the back as well as very expensive to buy from an engine point of view. i would have said 300 would probably be plenty.

I personally would go with a single engine to cut down on servicing, fuel, weight, costs and ongoing costs etc etc

imagine what your 6.5 went like with 150 and then consider 200kg more boat and 250extra hp..........mmmm possibly a bit much unless you are going to carry a lot of people/weight

i dont think mike has any longer moulds for a 8 or 8.5 so i guess it will be 7.5

that is the boat length i would have liked originally but only the 6.5 was available
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