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Old 02 May 2006, 17:33   #11
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Quote:
Originally Posted by nugent
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
My hair starts to get grey
400hp on the boat is not a problem but i think it can be very aggresive in high speeds so it will need a lot of control from the driver.
300hp single setup is pretty undramatic in 52 knots but still very sporty and comfortable ride, and so will the twin setup in 52 knots also be but than you still can get maybe 8 knots and you know how it is, always full throttle when you have that power but than the costs will increase
I dont really agree with the fuelconsumption, a boat that is aggresive in high speeds you often use around 4500 to 4800 revs, that fuelconsumption compare to 5,800 revs on a single installation is probably almost the same (i am comparing twin 200 to single 300 as mentioned)
The twin installation will hopefully hold longer because not using the last 1000-1500 revs but you still have to buy the engines and the price difference is pretty big so you have to drive many hours to save thoose money.
Everything depends of what amount of money you want to spend on props and steering but if you have a high budget you can have a great stable boat but offcourse the costs will increase
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Old 02 May 2006, 22:05   #12
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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?
It would be fun with the twins...... If you go that route put trim tabs on it, that way the boat will/should plane at lower rpm and the rpm factor is a major issue in fuel consumption. If I keep my foot out of it the motors I am running are decent on fuel, raise the revs by 4 or 500 at cruise and consumption takes off. I have got to say I really love having the twins, they sound so good when you nail it on takeoff... If you are gonna play I guess you got to pay!
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Old 03 May 2006, 02:03   #13
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nice imput,
jeezus nothing is easy is it,,, this is going to be used for pyro work so the cost doesnt hurt to much,as it goes on the books then gets rit of after few years (like that bit)
i did think it was a bit over kill 2 etecs on back, but osprey was offering the engines at right price for a pair, but yes you could save tadge under 8k minus 1 engine,
52 knots sounds good wid 300 though, guess you sit a nice aux on the back. and its a way home , it is going to be used offshore for various pyro work and testing, that would be a good day out for any one who likes a big bang,,

13 weeks build time this bit worrys me been there before, plenty second hand big ribs out there but , not the same a ssorting your own..mmmmmmmmmm
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Old 03 May 2006, 02:57   #14
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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?

My tornado has twin yamaha 4 strokes, weighing about 194kg each... boat normally flies quite straight, and lands nicely. Transom has no problems handling the landing with the weight on the back.
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Old 03 May 2006, 07:18   #15
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Quote:
Originally Posted by nugent
plenty second hand big ribs out there but , not the same a ssorting your own..mmmmmmmmmm
If I came into some money, I would be over to buy this: http://www.boatsandoutboards.co.uk/view/F96291

no good for commercial work though, but I ve always wanted a Phantom Evo
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Old 03 May 2006, 07:29   #16
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Originally Posted by Hugh Jardon
i think the fuel consumption would probably horrify you
Nah, Nuge is on the Sunday Times Top 100 rich list.

Stop wussing about and go for the twins.

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Old 03 May 2006, 09:16   #17
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Quote:
Originally Posted by davidmanning
Nah, Nuge is on the Sunday Times Top 100 rich list.

Stop wussing about and go for the twins.

DM
i wish dave,,,,,,,,,,now my mate, well he gets by..
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Old 03 May 2006, 09:54   #18
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Nugent,

I have been on a Viper max 7.5 with a Yamaha 250 4 stroke and an other one with an E-Tec 250 HP. both have almost the same speed. one is doing 53 kn (Yam) and the other one is doing 54 kn.

I know BMC is rebuilding a Lynx that used to have a single 250 VMax. The owner is putting 2 etec's 200HP on it.

In a couple of weeks they will also build a Viper Max 7.5 for competition with twin engines (but don't know what engines). Maybe you can give them a call for more info?

Paul
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Old 03 May 2006, 23:22   #19
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Engine choice

Nugent

Single with yam 300 all the time!!!

Go for it!
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Old 08 May 2006, 06:51   #20
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Nuget,

This weekend a asked about the 7.5 ViperMax they are going to fit with twin engines. They are going to put twin Mercury 200XS engines on it's back.

So i guess twin Etec's shouldn't be a problem ...

Paul
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