Ultrasonic Antifouling

[MapisM]

what I was trying to say - obviously badly is...

You didn't say it badly, it's upon your conclusions that I (as others) would disagree.
In order to attribute the lack of growth to the U/S (rather than to the A/F), you should have experienced a very similar (and not an higher) growth on the control panel, compared to the rest of the hull antifouled.

 

[MapisM]

yes I'll dive and get pics off u/w camera, but not yet cos the water is too cold!

Pah! Cold water is usually the best for clean u/w pics... (April 2009)

 

[Nick_H]

Mmmm what I was trying to say - obviously badly is that the control panel had barnacles on it the hull did not although it usually would and the stern gear is spotless, so compared to before we had the unit when we would have had a small number of barnacles on the hull and plenty on the stern gear is that it works for us. I should add that the boat has been in for eight months. Hope that is clearer! Jon

Jon, where is the transducer mounted, and where is the control panel relative to it? If the transducer is mounted over the sterngear, but the hull control patch is a good distance from it, then your results are fairly promising, although of course eight months to now is Sep-Apr, and the main fouling growing season is May-Aug!

 

[Jonmendez]

Good point, the unit is above the props slight basis to starboard but the control panel is about 6 feet further forward, not sure why just where we painted it at the time! I agree that the old anti foul is working, but the unit is designed to act together with it rather than as a stand alone, we have now re-anti fouled the whole boat (except the control panel) so this season will give us so information as to how it works in addition to anti foul.

 

[Ex-SolentBoy]

Blue and Green marine - update

Just done a haul-out, after another 6 month with UAF.

Description and pictures here:- http://www.ybw.com/forums/showthread.php?t=234776

Almost no barnacles on the prop, after a year in the water with just a pressure wash (no scraping) after the first 6 months.

 

[bendyone]

My first results are here http://www.ybw.com/forums/showthread.php?t=239437

 

[Nick_H]

Thanks for posting your results. It would be useful to know when the hull was last anti-fouled, and where the transducer is in relation to the prop.

 

[bendyone]

Kingfisher was antifouled when I got her in August last year, I dont know what was used. I have 2 transducers fitted one on the starboard side 1/3rd of the way back from the bow and one on the port side about 1/2 a metre in front of the prop. The manufacture was with me when we lifted out and has taken samples from the prop, but his thoughts were that the barnacles were old ( before the units were fitted) and were dead. He has taken some away for testing. Depending on the results we may fit an external unit above the prop or reprogram the existing stern unit to change/improve the frequency range that is being put out.
Measuring around the boat the ultrasound could be detected up to 50m from the boat so I am protecting some of the other boats around me.

 

[jfm]

I did a haul out of mine last week, after 2 months of u/s af, and the results weren't encouraging. Barnacles on props. Will post pics later