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Old 16 August 2009, 17:58   #1
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Over powering a RIB, AB VS vs VST

I have an AB VS that I thought was (bought used) a VST because it has the Console and seats, power tilt, etc. I have recently found out it is a Navigo VS and not an Oceanus VST.

I have an E-Tec 40 and am able to get a new e-tec 60 for virtually no cost to me.

But the plates say max 40 hp.

Has anyone gone 20hp over their limit on their RIB and what was the result?

I can't see only 20hp lifting the bow straight up like when people "over power" their boats by 50hp or more.

I do have a whale tale.

IMPORTANT: The e-tec 40 and 60 are virtually identical except in the hp. Same weight, gear ratio, etc.
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Old 16 August 2009, 18:35   #2
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Wouldn't worry at all - the weight on the transom is the most important thing - you can always throttle back a bit!!!
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Old 16 August 2009, 19:43   #3
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In the USA,I'd worry more about how much you'll get sued for when your insurance isn't valid after an accident...
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Old 16 August 2009, 21:07   #4
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In the USA,I'd worry more about how much you'll get sued for when your insurance isn't valid after an accident...
In the states and Canada if you get pulled over by the cops or CG and your over powered your out.
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Old 16 August 2009, 21:51   #5
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Simple - change the decals on the cowl - or change the cowl.........
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Old 16 August 2009, 22:39   #6
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Simple - change the decals on the cowl - or change the cowl.........
I plan on taking the decal off the cowl or putting a "40" on it.

I agree throttle back.

But has anyone done it? 20hp over?
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Old 17 August 2009, 05:11   #7
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I plan on taking the decal off the cowl or putting a "40" on it.

I agree throttle back.

But has anyone done it? 20hp over?
If you are going to throttle back why bother.

Is it right to think of it as "just 20 HP over" or would "50% over" be more concerning?
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Old 17 August 2009, 07:25   #8
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Because usually a throttled back engine uses far less fuel - and the extra power is always there if you need it!!!

Look how many older speedboats you see with engines WAY over what they should be. It's weight on the transom that counts.
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Old 17 August 2009, 10:59   #9
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If you are going to throttle back why bother.

Is it right to think of it as "just 20 HP over" or would "50% over" be more concerning?
a 60 on a 40 max boat is not 50%. The main fact here is the engines are both 240lbs on the money.

...Throttle back only means that as I can hit 38 mph with it now, if the 60 would do significantly more, and boat can't handle it, simply don't go past 38, or prop it so it won't.

I can't believe no one on this board has over powered. Strange.

The reason I want to do this are
1. Heavy loads; I can hole shot faster and easier and cut out the wallowing in the waves with a load of people when taking off from a standstill.
2. Be able to prop for hard hole shots and still have the 38 mph top I already have
3. Make the engine work less, especially loaded up
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Old 17 August 2009, 11:16   #10
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a 60 on a 40 max boat is not 50%. ...
Damn.. I must have missed something back at school...I always thought a 50% increase was..like one-and-a-half times something.......
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