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Old 24 November 2007, 15:30   #1
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175 or 200 on an Osprey 6.5 vipermax???

Well the hull's now finished and tubes are on, so i'll be off to collect very soon. Attention must now be turned to kitting her out.

So quite simply, assuming I stick with Suzuki, do I go for a 200 weighing 263kg or for a 175 at 220kg. Will the extra 25 horses be lost by the extra weight? A 14% increase in power for a 19% increase in weight! And before you all shout and say get an Etec, it hasn't been ruled out.

Any thoughts gentlemen?
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Old 24 November 2007, 17:16   #2
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The 19% additional weight is only the motor - what is the proportional weight increase for the entire rig? 43kg extra on a 1000kg-ish boat is only around 4% - Go for the 200
A 3.6 litre V6 will give bags more torque than a 2.9 litre in-line 4 and make the boat a much better all-round performer, which easily justifies the marginal extra cost to me.
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Old 24 November 2007, 18:23   #3
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Installed a Suz 175 on a Viper Max 6,5m, we achieved 46,7 knots.
Would have prefered the V6, not only for speed, less sound and better torque.
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Old 24 November 2007, 20:02   #4
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Go for the 200, if nothing else it will give better resale value. I'm sure you won't be dissapointed.
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Old 24 November 2007, 20:47   #5
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I reckon that I'm reasonably well qualified to comment on this one, go for the 200.
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Old 25 November 2007, 08:27   #6
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Quote:
Originally Posted by Mollers View Post
I reckon that I'm reasonably well qualified to comment on this one, go for the 200.
Yep i'd go for 200 49kts + and i run with a 15 2st aux and 25l fuel on the back

200 optimax and 4 pairs of ear muffs
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Old 25 November 2007, 09:49   #7
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Yep i'd go for 200 49kts + and i run with a 15 2st aux and 25l fuel on the back

200 optimax and 4 pairs of ear muffs
You should be able to get +- 52knots with a 200hp 2-stroke (depending on brand)
Can you fitt the engine higher?
Do you have any pics of the boat.
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Old 25 November 2007, 09:58   #8
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Quote:
Originally Posted by Petrov View Post
You should be able to get +- 52knots with a 200hp 2-stroke (depending on brand)
Can you fitt the engine higher?
Do you have any pics of the boat.
Which brand?
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Old 25 November 2007, 11:00   #9
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Which brand?
Did 52knots with a Yamaha 200HPDI, offcourse everything depends on eqiupment etc, thats why i wanted se pics of the boat.
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Old 25 November 2007, 12:25   #10
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Quote:
Originally Posted by Mollers View Post
I reckon that I'm reasonably well qualified to comment on this one, go for the 200.
There's an earlier thread debating the same point here:
http://rib.net/forum/showthread.php?t=11909



Mollers contributed on that one too:

Quote:
Originally Posted by Mollers View Post
I think that there is a danger of being "Power crazy". Considering that all outboards have a similar top rev range. If it's out and out speed that you're after, then yes you can run perhaps a higher pitched prop with more HP.But, when you have 6.5m Rib, running it's max HP engine and propped up, the slightest bit of sea and you won't be running it flat out unless you have balls of steel. On the other hand extra power is good when regularly carrying a boatfull of people, divers etc. How often do we run WOT? The fuel useage goes into orbit. Race prepped 6.5m Vipermax's ran 150's, which begs a question.
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