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Old 08 October 2013, 15:42   #81
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Originally Posted by captnjack View Post
Oh jeesh. I thought the engine was trimmed out to the point of ventilation and it was still bow riding?

After 8 pages I might have misunderstood...
That is correct.

PS. Not all 8 pages are about my boat!
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Old 08 October 2013, 15:45   #82
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Trimming the engine out made cavitation (ventilation ,,, whatever you want to call it) worse ;unbearable even in a straight line in second hole up (out) from transom. I can post a video of that if you like, or you can take my word for it. Even trimmed out, it still pushed the bow down. Trimmed in all the way (as in the pic) cavitation/ventilation was least.
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Old 08 October 2013, 15:47   #83
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I'm thinking that this is a problem with the hull ...

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Old 08 October 2013, 15:48   #84
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I'm inclined to start a separate thread for my boat problems ...
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Old 08 October 2013, 15:49   #85
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Originally Posted by Projectile View Post
Trimming the engine out made cavitation (ventilation ,,, whatever you want to call it) worse ;unbearable even in a straight line in second hole up (out) from transom. I can post a video of that if you like, or you can take my word for it. Even trimmed out, it still pushed the bow down. Trimmed in all the way (as in the pic) cavitation/ventilation was least.
Ok that's what I thought.

The only thing really capable of causing that across such a wide range of motor trim settings is a cup in the hull. Either the tubes are under inflated, the hull fabric is baggie, or the floor boards are too short.
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Old 08 October 2013, 17:20   #86
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The dealer should have picked up on the problem when he ran it. He may have been preoccupied with cavitation though, so I don't want to come down on him without having been there.

The area under a cupped hull could possibly cause air to be entrained in the water flow due to low pressure. Water boils at low pressure at room temperature, but I would not want to bet money on this situation.

If air is entrained in the water feeding a propeller, the bubbles will collapse on the prop blades as the pressure increases. That would cause cavitation which would eat prop blades in time. As the bubbles collapse, small amounts of metal are removed from the surface of the metal. I have seen impellers removed from pumps which cavitated which looked like swiss cheese.

I lean towards what captnjack posted. Cupping of the hull is a probable cause of the problem.

When the hull stretched on my Avon Rover, running the boat was a real experience. I was prepared to get rid of it and purchase another boat when a lady, probably an engineer, at Achilles diagnosed the problem and recommended I add length to my floorboards and see if that did not cure the problem. The boat performed like new with the tighter bottom.

I too was thrown a little by this thread dealing with multiple boats.
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Old 08 October 2013, 17:31   #87
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Quote:
Originally Posted by Projectile View Post
Trimming the engine out made cavitation (ventilation ,,, whatever you want to call it) worse ;unbearable even in a straight line in second hole up (out) from transom. I can post a video of that if you like, or you can take my word for it. Even trimmed out, it still pushed the bow down. Trimmed in all the way (as in the pic) cavitation/ventilation was least.
I would love to see one.
My bet is there is nothing wrong with your boat. You need 12 pitch 4 blade prop or 14 maybe even 15 pitch 3 blade. If you are not planning to cary heavy loads get 13" 4 blade prop. Run it at the 3rd hole.
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Old 08 October 2013, 20:45   #88
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Ok. I will post a video of the non-stop cavitation after supper.

I really appreciate all of the input from you guys. This is a big problem for me, and I feel like you guys are my only resource.
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Old 09 October 2013, 00:20   #89
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You now, the other thing about all of this is that it just sucks.

I bought a brand new boat from the biggest Zodiac dealer in NA. I had it shipped to Canada and paid duty.

I didn't try to swindle anybody or cut any corners.

I bought a brand new Evinrude outboard motor. Zodiac is a "preferred partner" of Evinrude, and Evinrude advertises their ETEC 30 on a very similar MILPRO inflatable.

Despite all of that, I have to deal with this crap. I just wish that my boat and motor worked well together.
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Old 09 October 2013, 07:28   #90
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Stuff happens, hang in there.
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