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Old 16 May 2014, 12:00   #11
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Originally Posted by boristhebold View Post
When you were 'flying' out of the water did you hear any alarms going off from the engines over revving ? Sounds to me like yes you have stressed the mechanicals to breaking point. Your engines I would have thought should have been giving you a lot of warning, if your revs go too high it should cut the engine.
I did not hear any warning alarms at all
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Old 16 May 2014, 12:15   #12
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Thanks two stoke mike
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Old 16 May 2014, 12:31   #13
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Are you backing off the props when coming out of the water or just leaving it pegged while you fly? I would never profess to being a racing boat driver but I have seen it on TV. I would think the out of water to in water transition would create a huge stress on the engines as the prop goes from biting air to biting water. Water is pretty hard and immovable on an impact like that.

I know there are some racing drivers on here, I am sure they will be along with suggestions.

jason
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Old 16 May 2014, 12:39   #14
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I left it peg for 7 mins maybe
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Old 16 May 2014, 12:56   #15
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I did about 30 hours on a twin Verado 300 RIB at close to 55 knots most of the time and the engines where fine even in pretty choppy conditions. It is true that active throttle control is important at those speeds and when the vessel is leaving the water but I am sure Verados have seen worse treatment than you have described. So in conclusion I think there must have be an underlying defect to cause this but nonetheless a more sensitive approach to what are a phenomenal engine package is a good idea.
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Old 16 May 2014, 14:54   #16
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We have run 250 Verado's now for 5 years, they are cracking engines.

We had the "standard" gearbox's on them for the first 3 years and found that every 360days (I kid you not), the counter-rotating gearbox ate itself. This was, in year one replaced under warrantee, and in year 2 as a goodwill gesture.
In year 3, when it failed again (remember the other gearbox was still original and in first class condition) our service agent had discussions with Barrus. In a fabulous act of customer service, Barrus replaced both gearbox's for the larger heavy duty box's.
Since then, they have both operated flawlessly. I would say the box's are smother and quieter. We had to tweek the prop's to get the rpm right at WOT.
I understand that since 2011/12, Barrus no longer supply the counter-rotating engine with anything less than the heavy duty gearbox.
My advice would be to approach the supplier of the engine and if that fails, talk to Barrus.
Regards
Steve
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Old 16 May 2014, 16:52   #17
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Barking the props is like lifting the drive wheels of your car at 70mph and dropping them back down again. Something is gonna break. Looks like a 600hp 10m rib is just too much for a first boat. Perhaps get some training and learn to to walk first....
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Old 16 May 2014, 16:52   #18
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Having taken the time to look at your pictures, it is the output shaft that has sheared.
We never had that problem, it was the internal gears that broke.

I am also concerned by the picture in the 3rd post. The bottom of the skeg looks wrong.
It has a flat bottom which looks unpainted? Has part of this sheared off? All our gearbox's have had a nice smooth profiled finish.
If not, it looks as though you may have hit an under water object, hard! This would have certainly been enough to shear the shaft too.
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Old 16 May 2014, 17:35   #19
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To determine what might have caused the shaft to fail would need the fracture surface to be inspected by a specialist.
This would indicate if the failure was sudden, due to a shock load or gradual due to fatigue. There may even be a manufacturing defect that can be seen.
I can suggest Materials Technology in Totton.

See what your insurers say - and suggest a specialist inspection.
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Old 16 May 2014, 23:22   #20
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Mercury warranties the broken prop shaft and propeller on my starboard side , I'm asking them to change my port side also , cause I lost my confidence on it already .
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