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Old 28 September 2012, 03:35   #1
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Elctronic device to keep growth off the hull

Has any body got any experience of these devices. I am looking at a sonihull gadget that keeps the growth off the hull. Looking for an alternative to antifoul. Opinions? http://www.nrgmarine.com/sonihull.html
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Old 28 September 2012, 03:55   #2
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Interesting. It apparently only weighs 3 Metres??!

It would be good if it works, I guess we wont know until someone puts their hand in their pocket and does a before and after comparison.

A season on a mooring in Chichester Harbour would be a good test for it, most boats start growing beards in a couple of weeks.
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Old 28 September 2012, 04:05   #3
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"Will i still need to paint my boat with antifouling paint?
Painting the hull is not only for purpose of antifouling. it is also an important waterproofing barrier, protecting the gel coat from the effects (and immense cost) of osmosis. Therefore we would still recommend that the boat is protected under the water line. In some cases to maximize performance some yacht owners who have installed the sonihull system have opted to use a harder grade of antifouling paint, as apposed to the soft self polishing versions which have a higher drag factor through the water. So although there is still a need for painting below the water line, when using the sonihull system the need to do so will be greatly reduced."

LOL - buy our kit but keep using the Antifoul!

Snake Oil, IMO.
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Old 28 September 2012, 04:37   #4
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it is also an important waterproofing barrier, protecting the gel coat from the effects (and immense cost) of osmosis.
um, is it not the case that anti foul is porous anyway, to facilitate the leaching of the active ingredient to prevent growth?

I am seriously looking at copper coat instead of traditional anti foul.
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Old 28 September 2012, 05:17   #5
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There's a few of these types if device around now and also a few independent tests by boaty mags etc.

General consensus is that they're all s**te and do next to nothing to weed growth

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Old 28 September 2012, 08:23   #6
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Originally Posted by martini View Post
There's a few of these types if device around now and also a few independent tests by boaty mags etc.

General consensus is that they're all s**te and do next to nothing to weed growth

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There has been some discussion on this topic over at YBW forums and the results have variable success just like antifoul paints working in some areas better than others, one thing is for sure - you'll need a mains supply!
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When a boat looks that good who needs tubes!!!
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Old 28 September 2012, 08:53   #7
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I considered this option and as they were based just down the road, they even offered a "good" price.

However, unlike other products, they could not let me have the details of an existing user so that I might talk to them or observe the product in use. This might have changed now(?)

My decision therefore was to go elsewhere. Have used CopperCoat and have NO regrets

Steve
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Old 28 September 2012, 17:24   #8
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*in a phenomenon known as "cavitation."*

That will be the effect that destroys propeller blades & eats chunks out of pump impellers...
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Old 28 September 2012, 17:34   #9
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So why doesn't it clean the antifoul paint off then?
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Old 29 September 2012, 03:49   #10
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*in a phenomenon known as "cavitation."*

That will be the effect that destroys propeller blades & eats chunks out of pump impellers...
Cavitation is caused by reducing pressure of water to the point where it allows gas to form (essentially evaporating water within the liquid itself.) Once pressure is restored, the bubbles collapse, and the resulting pressure waves cause the destructive force that eats props.

So how does this magical thingie cause cavitation? Magnetically affecting water? Good luck...

jky
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