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Old 01-09-2016, 15:01   #1
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Antifouling devices

Hi fellow boaties.
My question is .Has any body tried or used these sonar antifouling devices.Is it any good.Does it work and if so what are the best devices.Im gessing you would still have to antifouling paint.But how long before repainting and how much hull cleaning needed.
Cheers Peter

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Old 01-09-2016, 20:43   #2
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Re: Antifouling devices

They can extend your antifoul over several years. The Jaycar kit (Silicon Chip magazine design) is the cheapest option if you know how to build electronic devices.

Since this was posted to the multihull forum I should also mention that you'll need one transducer per hull. They also work best on fibreglass, steel and aluminium hulls; not so great on timber or ferro due to lower density.

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Old 02-09-2016, 02:57   #3
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Re: Antifouling devices

Lots of opposing opinions about them here's a long thread you may like to consider:

Ultrasonic Anti-Fouling
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Old 22-02-2017, 11:07   #4
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Re: Antifouling devices

I have just installed the JayCar Sonar transducers on my cat, 48' aluminium, 3 sonar transducers in each hull. Will let you know how it goes. Just now the hulls are dirty, ready to paint next month in Trinidad.
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Old 22-02-2017, 11:11   #5
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Re: Antifouling devices

The day that an anti-fouling device actually works will be like the day that a pill actually exists that will make you lose weight while you sleep.
There will be so much demand for it you won't be able to buy it and there will be no doubt about whether it actually works or not as every expert will be extolling its virtues and every sailing magazine, internet forum etc. will be covered in stories about it..

I don't think that day has come yet.
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Old 07-03-2017, 02:37   #6
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Re: Antifouling devices

Hi Peter

I fitted the jaycar unit to a RL28 a few years ago and it made little to no difference. You face 3 problems, the leopards have a thick solid glass underwater profile which may be outside the units specification, the ultrasonic units are not suitable for a foam/balsa cored boats and I don't believe that your sail drives would be protected by the unit.

I will not fit another one until the technology improves.
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Old 07-03-2017, 03:34   #7
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Re: Antifouling devices

I hope I have more luck with my sonar, being installed on my aluminium hulls with shaft drives. I have had good reports from friends with alu boats.
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Old 07-03-2017, 03:36   #8
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Re: Antifouling devices

Greetings and welcome aboard the CF, Triwander.
Gord May
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Old 07-03-2017, 04:10   #9
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Re: Antifouling devices

Two things come to my mind.
First if these units would work the big ship industry would already know. These folks spend millions on antifouling, and more for the dry dock time required. Even if these units just extend the lifetime of antifouling by a small percentage they would deploy such units on a global scale within a very short time frame.
However they don't. your chances of success are pretty much nil.

Second if I understand correctly these are devices inducing strong ultrasonic vibrations into the hull. What does a strong permanent ultrasonic blast do to fibreglass? Could this weaken the internal structure over time? I don't know.

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