Ultrasonic

Who was that guy doing that test,

I would be interested in the results

I assume silence = failure??

Thanks for the reply

I was interested i how it was going

How long has it been on for now ?

Ultrasonic Antifouling system update - 2 years 4 months on

Manufacturers basic requirements for best results:
- Clean freshly antifouled hull (I failed to meet this as fitted 7 months since antifouling)
- Continuous full power supply
- Correct installation including all parts below the water line to be in direct contact with the hull (trim tabs are isolated from the hull)
- Regular boat usage ( I again failed to meet this as about 50 hours use in 2 yrs)

Time line

Boat Location and usage: Southern end of Lake Macquarie NSW, very little use ie about 50 hours over 2 years

November 2011 - Boat antifouled

End July 2012 - Ultrasonic antifouling system fully operational so about 7 months since anti fouled including a summer

End November 2013 - boat out of the water and antifouled (as in previous years) with Alex No. 5 on hull and speed prop on shafts, rudders and props. Previously I also did the trim tabs with speed prop however did not this time, I now realise I should have.

April 2014 - see status below

Photos ( photos will not load but will keep trying)
No weed growth or shell fish, looks worse in photos than real life, all came off easily with high water pressure clean with no additional work require prior to the wet and dry rub before applying the paint. Anyone know what the orange growth is?

Results comments

Prior to fitting the system the boat was antifouled annually and boat usage was mostly 100 hours per year.

Test period -When the boat was taken out of the water after 2 years and about 50 hours use and 17 months with the system fitted the result was close to the same for 12 months as above without the system.

Now at 4 months on (1 December 13 to April 14 ie a full summer) with the system fitted and fresh antifouling there is no growth on the hull however parts that are isolated from the hull eg trim tabs have some growth and a few shell fish - fortunately these are easy to reach and clean. I did a dive under the boat in clear water to check and all I noticed was slight slime and less than 5 to 6 small shell fish.

Further Comment
I think I would always take my boat out of the water every 2 years regardless. However, even with this frequency which is better than annually as prior to fitting the system the system is satisfactory for me.

For those people curious about this sort of thing!

forums.ybw.com/index.php?threads/ultrasonic-antifouling.393421/

To me it looks more like an algal growth, similar to a lichen you would see growing on a rock.