rmiker 15 Posted May 15, 2017 Share Posted May 15, 2017 Does anyone have any experience with these? http://www.trademe.co.nz/Browse/Listing.aspx?id=1321370008 I have heard good things so I am keen to fit one. Quote Link to post Share on other sites
Steve Pope 243 Posted May 15, 2017 Share Posted May 15, 2017 Give it a go and let us know. Quote Link to post Share on other sites
rmiker 15 Posted May 15, 2017 Author Share Posted May 15, 2017 Give it a go and let us know. Well just awaiting a little feed back about that particular unit advertised from someone that has used that technology....... Then I may just do that... or not Quote Link to post Share on other sites
mattm 98 Posted May 15, 2017 Share Posted May 15, 2017 I installed one for a guy once, can't say it was that exact one / brand, and it was a while ago, but the components looked similar. It's was ready to go too, not diy build. The guy had some interesting ideas, and said he was going to be the import agent for them, as well as externally mounted bow thrusters (he had me wire up one of those too). He otherwise had no involvement with the industry. The boat grew fur (say 20mm thick, light weed) just as fast as any other, and the transducer itself had 2 to 3 foot long weed after a few months, the thruster got really covered also, lots of intricate shapes for stuff to grow in. The ultrasonic unit failed after maybe a year, and he didn't have it replaced. The boat was ply, the one you linked says don't use on wooden boats, which may explain it, I think I recall the instructions that came with his one said that too. I assume wood is a no go because it doesn't carry the vibration well enough. Wouldn't explain the long weed on the transducer though. Quote Link to post Share on other sites
wheels 543 Posted May 15, 2017 Share Posted May 15, 2017 They do not work. They are complete snake oil. The few still selling these things are simply ripping people off.Same can be said for those Rodent units you plug in at Home, but that's another story.I have said this on here many times. The reason why they don't work is that firstly, unless evolution has dramatically changed Marine life very recently, plant life and Shell fish do not have ears. You may, if the power is sufficient enough, stop growth on the transducer face itself. But it would have to be very powerful and as such, you would not want to be running it from your Batteries. And then, if it were that powerful, one would have to be concerned with the larger Marine life that do have either Ears, or the means of detecting vibrations. But the idea that ultra sound can clean an entire Hull is just plain not possible.Ultrasound can in certain circumstances, be used to keep things clean and this is where this idea came from. But the person that came up with the idea can't have understood the concept of where they are used. Which is in cooling water for machinery and such, where intense Ultra sound disrupts growth of algae in the cooling ponds. But the energy is ultra powerful and simply not possible in the Marine environment. 1 Quote Link to post Share on other sites
waikiore 398 Posted May 16, 2017 Share Posted May 16, 2017 Wheels is dead right, this comes up every few years -simply put doesnt work no matter how much you may want to believe them. Quote Link to post Share on other sites
harrytom 641 Posted May 17, 2017 Share Posted May 17, 2017 Ha Ha works perfectly fine,do not no if it stops growth?but sure helps to eat up anodes of surrounding vessels in a mooring area. Quote Link to post Share on other sites
w44vi 17 Posted May 17, 2017 Share Posted May 17, 2017 If it did work all the commercial operators would be using it Quote Link to post Share on other sites
wheels 543 Posted May 17, 2017 Share Posted May 17, 2017 Ha Ha works perfectly fine,do not no if it stops growth?but sure helps to eat up anodes of surrounding vessels in a mooring area. Umm...nope, it can't do that. It's sound vibrations, not electrical current. Quote Link to post Share on other sites
wheels 543 Posted May 17, 2017 Share Posted May 17, 2017 If it did work all the commercial operators would be using it Fullers did try a real McCoy commercial version, but it was no good. Quote Link to post Share on other sites
harrytom 641 Posted May 18, 2017 Share Posted May 18, 2017 Umm...nope, it can't do that. It's sound vibrations, not electrical current. explain to owners in close vicinity why bronze props on 3 vessels showed signs of electrolysis,never a problem till this vessel arrived and owner was telling everyone how he had electronic device to stop foul? Quote Link to post Share on other sites
Island Time 1,214 Posted May 18, 2017 Share Posted May 18, 2017 it may have had a stray current issue, but ultrasound has nothing to do with corrosion... Quote Link to post Share on other sites
wheels 543 Posted May 18, 2017 Share Posted May 18, 2017 OK so when you say "Electronic device", is that what he actually said, or are you using another word for the Ultrasonic device?Even if there was a problem with the Ultra sound transducer, I can't see it doing anything anyway. We are talking of a Depth Sounder type device using a frequency down in the slightly above audible range and not the ultra high frequencies the Depth sounders use.Electrolysis is caused by an electrical current and to affect adjacent boats, it has to be quite a large current. And in saying that, the first thing to go is the Anode, not the Prop. Although Prop tends to be a close second. 1 Quote Link to post Share on other sites
harrytom 641 Posted May 18, 2017 Share Posted May 18, 2017 yep all 3 had electrolysis damage,may not be the device as described on thread,but the thing you put over the side and it sends a pulse. I cannot see how it would possibly work,but if it does why are we not all having them fitted, "Wheels" you maybe correct that there is a strong electrical discharge from said vessel,strange how it did not effect own vessel.Might have possibilities in a marina but a swing mooring? Will have to find out more from owner. www.jaycar.com.au/2-channel-electronic-antifouling-unit-for-boats/p/YS5600 Quote Link to post Share on other sites
wheels 543 Posted May 18, 2017 Share Posted May 18, 2017 Arrr, righty, sounds like it could be a device I have heard about, but not yet come across. A silly idea in my view. It is a Copper Rod you hang over the end of the vessel and it pulses an electrical current into the water, which is picked up by a Conductive rod at the opposite end of the vessel. Thus by this electrical current, the Copper Ions migrate from the Rod, supposedly flowing over the Hulls surface, to the other rod. The Copper Ions thus stop growth. To me, it can't work, simply because the copper is in the water itself and in a very weakly distributed form and would never stop any growth. Then add in the electrical current in the water. Far too low to cause a danger to anyone in the water, but most certainly powerful enough to cause an issue to other boats if the thing does not work correctly. In theory, it should be isolated from other Hulls, but we all know about Theory and Salt water. 1 Quote Link to post Share on other sites
harrytom 641 Posted May 18, 2017 Share Posted May 18, 2017 speaking of anodes,mine,has been on 12 months with little activity,should i be concerned?batteries are off and auto bilge pump has own small battery on a solar charger,not connected in any way to yacht,no water in bilge either which is the name of the game. Quote Link to post Share on other sites
Island Time 1,214 Posted May 18, 2017 Share Posted May 18, 2017 Little activity - a bit subjective. Is there any sign anything else is being eroded? If the anode is not well electrically connected to the boats ground, then it might not erode, but something else will! If no sign of any issues, and it shows some erosion, it's probably ok. IMO. But remember it may be eroding something hard to see... Quote Link to post Share on other sites
harrytom 641 Posted May 18, 2017 Share Posted May 18, 2017 Little activity - a bit subjective. Is there any sign anything else is being eroded? If the anode is not well electrically connected to the boats ground, then it might not erode, but something else will! If no sign of any issues, and it shows some erosion, it's probably ok. IMO. But remember it may be eroding something hard to see... Replaced engine anode,but shaft anode,little wear,bit of pitting as you would expect,no sign on mast or through deck ring,s/s fitting fine,push/pulpit usual staining,prop shaft only contact is direct to engine as have dripless shaft seal. But 2 years ago went through 2 in 9 months,been a change of vessels around in that time. Quote Link to post Share on other sites
waikiore 398 Posted May 18, 2017 Share Posted May 18, 2017 Hit the nail on the head it was your neighbours, with current boats using propspeed on the prop and maybe shaft you should see very little activity on your anode, most NZ wooden boats are over compensating with anodes causing their own issues. Quote Link to post Share on other sites
wheels 543 Posted May 19, 2017 Share Posted May 19, 2017 Replaced engine anode,but shaft anode,little wear,bit of pitting as you would expect,no sign on mast or through deck ring,s/s fitting fine,push/pulpit usual staining,prop shaft only contact is direct to engine as have dripless shaft seal. But 2 years ago went through 2 in 9 months,been a change of vessels around in that time. A sign the anode is not working or over sized is a white coating on it's surface. If it is dark grey and easily gets on your fingers if you touch it, it is working. Unless you boat is upside down, an anode will not protect anything above waterline. Only what is below immersed in the Water. Quote Link to post Share on other sites
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.