Jaycar sellng electronic antifouling units for boat. Gary Johnston does a video. - Page 1
Forum section: electronics / general

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 21, 2012, 08:35:28 am
content: http://jaycar.com.au/productView.asp?ID=YS5600&utm_source=JFP_N1&utm_medium=WEB&utm_campaign=FPCWhat do you think?

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 21, 2012, 08:44:34 am
content: that must piss off the dolphins , whales and sharks.

author: EEVblog
author_rank: Unknown
timestamp: March 21, 2012, 09:27:56 am
content: First up, I doubt it's a bullshit product.I come from the marine sonar business and can confirm the military sonar side of things as stated.But second, as siliconmix said, it does piss off the animals intheirbackyard. Not good.Imagine ifeveryboat had one of these things blasting out...And that is a first indeed, a video from Gary.Dave.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 21, 2012, 09:47:46 am
content: Yeah. Not calling bullshit at all esp if the #1 gets up and spruiks. He has cred.QuoteYeah. I'd like to see more. I only hope he has a shot of whiskey before the shoot. Not a Mike Willessee sized shot of whiskey mind ya, just a big enough belt to allow him to leave his damn collar alone!

author: kaz911
author_rank: Super Contributor
timestamp: March 21, 2012, 11:12:36 am
content: The type of products work reasonably. But they use so much power... (18ah/day) so you need a generator or shore power to use it - or a solar setup with about 220 ah batteries and 240 watt of panels..And if you have a sandwich hull you need to open it up to place the transducer on the outer part of the hull.

author: T4P
author_rank: Super Contributor
timestamp: March 21, 2012, 04:47:39 pm
content: Only great if it is placed on a middle sized boat and upwards , the ones that passengers board with windows and A/C as they already have big battery banks and generators . 18amp-hours ( no pun intended ) is really something to behold .

author: bilko
author_rank: Frequent Contributor
timestamp: March 21, 2012, 06:39:38 pm
content: Its 18AH per day, and that's when the boat is in the dock with shore power. Whilst cruising you don't need it to be be switched. To put it into perspective a laptop could easily use 100AH per day!For boats that are left tied up in the marina 90% of the time (which is most boats) it could be a good idea.

author: BravoV
author_rank: Super Contributor
timestamp: March 21, 2012, 07:21:02 pm
content: I'd imagine somewhere in the deep ocean there was a conversation when a boat using this gadget passing by ....<sonar operator> Capten, we're having problem tracking this new stealth sub in front of us, this pesky sound from the yacht above us is jamming our sensor ...<skipper> God damn it, just blow sob sky high, nobody knows since we're in the middle of nowhere anyway ... <with big grin at the face><sound from the intercom speaker> Torpedo is now loaded ...<warfare specialist> : Yacht impeller sound signature is locked and secured<skipper> : WHADAYA WATING FOR !!! Press that farking big red button now will ya ...Sorry, can't help it, its just I watched too many subs movies.

author: kaz911
author_rank: Super Contributor
timestamp: March 21, 2012, 07:40:49 pm
content: Quote from: yachtronics on March 21, 2012, 06:39:38 pmThe "most" power hungry "notebook" I had was the ThinkPad Dual Screen. That had a running consumption when battery was full of max 3 amp @ 19v. Average consumption was about 38 watt.I live in a pretty bad area for fouling. And the Ultrasonic works - but is far from perfect. You still need to keep you boat with anti-fouling paint every 2 years or so. So you save about a years worth a paint with the ultrasonic system. And the installer needs to know what he is doing - else it has little impact. But there are 7-8 companies out there doing Ultrasonic Anti-foul so there must be some clients who it works well for.

author: bilko
author_rank: Frequent Contributor
timestamp: March 21, 2012, 08:38:12 pm
content: Quote from: kaz911 on March 21, 2012, 07:40:49 pmDid you build and install the Jaycar version ?How many transducers do you use and what sort of boat do you have ?I'm just looking into different options at the moment, I'm getting different feedback from the US systems, some good, some not so good.

author: kaz911
author_rank: Super Contributor
timestamp: March 22, 2012, 03:53:33 am
content: To be honest the Jaycar system looks a bit on the "old" side. The one that is most sold down here is the British one fromhttp://www.ultrasonic-antifouling.comI don't have it on my boat yet since I am using a copper ionisation system right now.

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 22, 2012, 08:35:51 am
content: Speaking of pissing off little fishies, don't depth sounders cause the same, in not more, ruckus down there?

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 09:35:58 am
content: yep.thats a good reason not to add anymore then

author: Ed.Kloonk
author_rank: Super Contributor
timestamp: March 22, 2012, 10:03:21 am
content: Quote from: siliconmix on March 22, 2012, 09:35:58 amI am convinced that when we go outside fishing, the times that we've forgot to turn off the sounder correlates with no bite days. Just sayin. I mentioned this to an uncle who fishes semi pro and he vouched for my story. I tell you that to ask you this. If the boats are moored, do you wonder if the fish are going to avoid being around the boats that normally offer so protection from the bigger fishies?

author: kaz911
author_rank: Super Contributor
timestamp: March 22, 2012, 10:27:03 am
content: I have a fish finder and a dept sounder on my boat. (50kHz/200kHz & 239 kHz) (And I grew up on a commercial fishing harbor and have plenty hours out on trawlers)The fish around my boat does not care the slightest if my sounders are on or off.They don't even flinch when I turn on the sounders. On the commercial trawlers there is no evidence of less catch if you use sounders or not. Most commercial fishing boats have more sounders than you can count. Different frequency = different dept. Plus new chirp based sounders for enhanced definition.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 12:06:32 pm
content: how do you know dolphins and whales aren't affected.

author: kaz911
author_rank: Super Contributor
timestamp: March 22, 2012, 12:16:37 pm
content: Quote from: siliconmix on March 22, 2012, 12:06:32 pmI have not got any big whales around. But I have Spinner- and Bottle-nose Dolphins around where I live. And they are just as playful with sounders on or off. Just about 1/2 nm from me is a place where we have dolphins feeding every day - and they don't run away or seem bothered at all. They swim around the boat and scoot under it no matter if sounders is on or off.So if there is any impact - I do not think the Dolphins are bothered enough to care about it.Ohh and while we are out there we often see them catch other fish and eat them- and it is amazing to watch - because they seem to share the catch between them - one takes a bite - then hands it over to the next that takes a bite. Amazing to watch. (And if anyone wonders where I live - I am in Abu Dhabi on the waterfront close to the F1 track)

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 12:50:17 pm
content: take a look at this.i know its vlf .http://www.ehow.com/how-does_4567005_sonar-work.html

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 12:55:55 pm
content: and herehttp://www.dolphins.org/marineed_acoustics.php

author: kaz911
author_rank: Super Contributor
timestamp: March 22, 2012, 01:16:35 pm
content: Yes - but all the above problems are based on LFA Sonar at 80-180 Hz. Not normal 39+ kHz fish-finders or ultrasonic transducers for boat cleaning. You wont like to be shot with a high power 80 Hz beam either....I do agree that you should keep sound levels down.But "normal" 39+Khz products have a very shallow range. Fishfinders and depth gauges are quite directional but have long range. Ultrasonic cleaning devices are attached to the boat hull - and has a wider spread - but much less "power" pushed into the water. Quite a lot is lost in transmission between hull and water (6-12 db)

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 01:30:06 pm
content: i take your point about the frequency and spread and penetration.but as dave said what would it be like if every boat had one fitted.there must be other ways to clean boat hulls without dry docking them.divers scrubbing? uv light treatment ?.

author: kaz911
author_rank: Super Contributor
timestamp: March 22, 2012, 02:04:58 pm
content: as I said - i ACTUALLY use a copper ionisation system for keeping my boat clean.UV Light does not work. It will kill bacteria close by - but inspire algae to grow further away.Scrubbing - that works - but you try to get a boat full of barnacles clean. My 21' boat takes 4 hours to clean with special tool called a wave blade... And in the summer time you have to do it twice pr. monthI promises you that if I could find an easy way to keep the boat clean - I WOULD...My "clean top speed" is 41 knots. But with just a bit of growth - it drops to about 32. With a lot of growth it drops to 27. So fuel consumption goes through the roof. So use more fuel and kill the planet or use paint and kill the planet - or use transducers to keep it clean - and piss off a few fish (maybe) or use Cu Ionisation (that so far does not seem to have side effects if you dose it correct)I have on purpose NOT painted it with anti-fouling paint to check out how the different alternative systems work...So that is why I know a little bit about the subject.

author: siliconmix
author_rank: Frequent Contributor
timestamp: March 22, 2012, 02:23:55 pm
content: well copper ionisation sounds good to me.there's a lot to be said for the old ways.