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Old 16 May 2014, 11:42   #1
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Broken prop shaft on Verado 300 , 101 hours only

I am new in the boating world and I would like to know if this has ever happened to anyone of you. I read in a forum that this is because of barking the props but from what I know and see on Youtube, rib boats are very fast, light and comfortable. Even if you are riding fast you still feel comfortable and confident riding it. But before I broke the propeller shaft, I played around with the boat at around 65 miles per hour on 2-3 feet chops of water for about 7 mins with 6 other passengers and I could feel that we were flying. The props were in and out of the water. The next day I drove around at cruising speed of 35-40 miles per hour. After a few hours, I refueled. Afterwards, I was cruising at 40-45 miles per hour when suddenly the RPM on the starboard side went up. Upon checking, we discovered that I do not have a propeller and a propeller shaft anymore.

Any thoughts on this? When we rode at 65 mph the day before, my trim was up. Do you think I stressed the propeller shaft too much?

My boat is a 10 meter rib twin Verado 300 and lower unit is 4.8 in diameter. Bravo 1 props with Flow torque 2
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Old 16 May 2014, 11:50   #2
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Country: Ireland
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Boat name: Clewless
Make: Valiant DR 490
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Was the shaft that broke on a counter rotataion engine?
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Old 16 May 2014, 11:51   #3
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Broken prop shaft pics

Pics of broken shaft
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Old 16 May 2014, 11:52   #4
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Yes it's a counter rotation
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Old 16 May 2014, 11:54   #5
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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.
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Old 16 May 2014, 11:54   #6
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Country: Ireland
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I recall on this forum that a rib user with similar sized engines had a similar problem on at least two occasions on the CR engine. I just cannot find it now.
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Old 16 May 2014, 11:55   #7
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You are new to boats?
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Old 16 May 2014, 11:55   #8
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2nd pics of broken shaft

Broken prop shaft
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Old 16 May 2014, 11:57   #9
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Yes 6months
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Old 16 May 2014, 11:59   #10
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Country: Ireland
Town: Castlebar
Boat name: Clewless
Make: Valiant DR 490
Length: 4m +
Engine: 60 hp ETEC
MMSI: Awaitng one
Join Date: Oct 2007
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see this it might be of interest but I know that there is more I think if you send a message to 250kts the original poster he may be in a posityion to advise


Counter-rotating Gearboxes
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