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Old 22 October 2014, 10:58   #1
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Overpowered Rib

This 8m Astec rib with Yamaha 350V8 seems a bit over powered, maybe 250 HP would have been more than enough, especially considering that almost wears nothing on board...



Although maybe it is to catch the bad guys if they escape, but rather it is a vessel for use by divers
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Old 22 October 2014, 11:13   #2
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This 8m Astec rib with Yamaha 350V8 seems a bit over powered, maybe 250 HP would have been more than enough, especially considering that almost wears nothing on board...



Although maybe it is to catch the bad guys if they escape, but rather it is a vessel for use by divers
Don't know about overpowered, but it looks like it blew the budget as nothing left in the kitty to fit it out!

All looks very tame to me!
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Old 22 October 2014, 11:23   #3
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What happens if you over power a RIB, doesn't it just go faster
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Old 22 October 2014, 13:38   #4
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Quote:
Originally Posted by Nick Hearne View Post
Don't know about overpowered, but it looks like it blew the budget as nothing left in the kitty to fit it out!

All looks very tame to me!
Power looks fine to me!....Definatly needs some weight forward to make the most of it though
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Old 22 October 2014, 13:44   #5
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What happens if you over power a RIB, doesn't it just go faster
or it starts to chine walk and flips the crew who appear to have no seats out!
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Old 22 October 2014, 14:33   #6
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Why would "overpowering" cause it to chine walk?
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Old 22 October 2014, 14:58   #7
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Guardia Civil tend to keep the boats they pull that are shall we say in the "import business" so this could be a a boat that was intended to be run with a bit of weight up front.
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Old 22 October 2014, 15:24   #8
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2 stroke is best lol

The vids a bit poor but woth the effort

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Old 22 October 2014, 15:32   #9
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Why would "overpowering" cause it to chine walk?
I'd have thought that would be obvious to you. Are you suggesting that power is not a significant contributing factor in chine walking?

Which bit of my logic is flawed?

Increased power = faster. Faster = more lift. More lift = less surface area in the water. Less surface area = more likely to imbalance. Imbalance + high speed = chine walk.

The advice always given here to people who experience a chine walk is to back off the throttle. There is other advice about trim, engine height etc to try to prevent it - but the universal message is that to stop it rather than make it less likely: slow down.

Its probably exaggerated on boats which are overpowered because they tend to be badly set up too with heavy engines etc.

Now I'm* not saying 350HP on an 8m boat is overpowered, I was answering the question "What happens if you over power a RIB, doesn't it just go faster".

*although ISO6185 suggests it might be!
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Old 22 October 2014, 15:34   #10
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[QUOTE=bartiny;652381]The vids a bit poor but woth the effort QUOTE].... and is an excellent demo of what happens when you overpower a rib !. Chine walks as soon as he opens it up so a complete waste of time
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