Ultrasonic Hull Protections - SailNet Community
Reply
 
LinkBack Thread Tools
post #1 of 19 Old 02-17-2010 Thread Starter
Columbia 22
 
Join Date: Aug 2008
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Ultrasonic Hull Protections

My friendly boat guy has started recommending products like Hull Guard (HullGuard: Ultrasonic Algae & Barnacle Protection) as an environmentally sound way of keeping the hull clean of marine life.

It will likely cost more than 3 seasons worth of paint, but the promise is that it doesn't have any of the poisonous leaching of regular bottom paint, and keeps the bottom clean.

Any thoughts on it; has anyone used it?
miggidy is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #2 of 19 Old 02-17-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
IMHO, it's snake oil, much like the Algae-X device... lots of claims, but no real substantive data to back up their claims.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #3 of 19 Old 02-17-2010
Reward for lost Kraken!
 
hellosailor's Avatar
 
Join Date: Apr 2006
Posts: 11,542
Thanks: 6
Thanked 136 Times in 133 Posts
Rep Power: 11
   
Ask your friendly boat guy if he will guarantee, in writing, to clean your hull once a month every month for the next five years, FREE, if that ultrasonic gizmo doesn't work.

I'll bet he won't, because if they worked as claimed--they'd have spread like wildfire by now.
hellosailor is offline  
Quote Quick Reply Share with Facebook
post #4 of 19 Old 02-18-2010
Sailor
 
Gladrags1's Avatar
 
Join Date: Apr 2003
Location: Rock Creek, Maryland
Posts: 673
Thanks: 10
Thanked 15 Times in 15 Posts
Rep Power: 13
 
A member of my sailing club has had a similar product installed for the past several years and claims that not only has it kept her boat clean of slim and barnacles, it has kept the pilings next to her boat similarly free. She has not painted her boat's bottom in many years. She got this device from a man who was developing it in Florida. airly recently, I saw a similar device made in England. The diference between these devices seem to be that my fellow club member's is aalog and the newer device is digital. I don't understand why it works but it does seem to work. The biggest problem with this new device appears to be not how it functions but how it has been brought to market. It doesn't look like it has been capitalized enough to make some extensive tests and promotions. I sent an e-mail to the company offering to test it in my boat here in the States but unfortunately never got a response. :-( There are too many other worthy projects on my boat for me to spend quite so many boat bucks on that item.
Gladrags1 is offline  
Quote Quick Reply Share with Facebook
post #5 of 19 Old 02-18-2010
Telstar 28
 
sailingdog's Avatar
 
Join Date: Mar 2006
Location: New England
Posts: 43,290
Thanks: 0
Thanked 15 Times in 12 Posts
Rep Power: 14
         
And, the large shipping companies would all be using them... do you know how much money a large shipping company would save if it didn't have to haul its boats out to re-paint the bottoms on a regular basis???

Quote:
Originally Posted by hellosailor View Post
Ask your friendly boat guy if he will guarantee, in writing, to clean your hull once a month every month for the next five years, FREE, if that ultrasonic gizmo doesn't work.

I'll bet he won't, because if they worked as claimed--they'd have spread like wildfire by now.

Sailingdog

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Telstar 28
New England

You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

If you're new to the Sailnet Forums... please read this
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
.

Still—DON'T READ THAT POST AGAIN.
sailingdog is offline  
Quote Quick Reply Share with Facebook
post #6 of 19 Old 02-25-2010
Senior Member
 
Join Date: Feb 2008
Posts: 116
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Ultrasonic energy can be used to control algae, the problem is the application of the ultrasound at sufficient power to a wide variety of hull compositions and water conditions.

The original researchers used 120 watts of ultrasonic power at 28 kHz and killed blue-green algae in test tubes. This is a long, long, way from killing algae around a 40 foot hull in the soup of western lake Erie on a hot day.

The propagation of the ultrasound is greatly affected by the material, thickness, and temperature of the hull. The temperature and suspended air in the water has a big effect.

The tuning (to the most efficient frequency) is critical. The cited company says their device "auto-tunes", but I'm not sure how that works - it sounds like magic to me.

If ultrasound were a sure-fire way of killing algae, nobody would ever see marine growth on the face of their depth sounder transducer - that is propagating ultrasound 100 feet or more at 50 kHz - pretty powerful - so why does algae grow right on the face (at least it does on mine). I know the sounder isn't on all the time, but in the initial research the powerful ultrasonic energy killed the algae, collapsed the algae's vacuuols, and caused to algae to detach and settle.

Oh, and about the toxic nature of bottom paint; unless it is ablative, the heavy metal doesn't enter the water.

Oh, and when you kill algae, which is what this system does (it doesn't just scare them away) the algae release iodine in significant quantities into the water. I think Iodine is toxic.

It sounds like these are expensive! If you want to make your own cheap version to try, go buy a medical cell disrupter on ebay: I got one for $150 that runs at 20kHz and 200W from 120VAC. Glue the transducer to the bottom and see what happens.

Anyhow, it's a good idea, but the practical application is the challenge.

Best Regards,

e

.::.
eolon is offline  
Quote Quick Reply Share with Facebook
post #7 of 19 Old 02-25-2010
Junior Member
 
Join Date: Feb 2010
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Hi guys,i am going to install ultrasonic antifouling on my IP350 in april when she is lifted for maintenance.I will be sure to let you know the result.Remember-True Knowledge is the product of direct experience.(Mao Tse Tung).
rotrax is offline  
Quote Quick Reply Share with Facebook
post #8 of 19 Old 02-25-2010
Senior Member
 
Join Date: Feb 2008
Posts: 116
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
 
Wow, it's so interesting to see a Mao quote. My favorite is "Communism is not love. Communism is a hammer which we use to crush the enemy." Mao was probably busy exterminating millions of his own countrymen and never heard the antithesis of your quote, "you don't have to be a chicken to know about eggs".

Best Regards,

e

.::.
eolon is offline  
Quote Quick Reply Share with Facebook
post #9 of 19 Old 02-25-2010
I don't discuss my member
 
Fstbttms's Avatar
 
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 2,190
Thanks: 6
Thanked 26 Times in 26 Posts
Rep Power: 13
 
I wish I had a dollar for every thread I'd read about ultrasonic anti fouling. It's always, "I know someone who's neighbor had a friend who's brother's boss used it and it worked great!" Funny how there's never any first-hand anecdotes.
Fstbttms is offline  
Quote Quick Reply Share with Facebook
post #10 of 19 Old 02-26-2010
2nd mate
 
Join Date: Aug 2009
Location: Belgium
Posts: 42
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
Originally Posted by sailingdog View Post
And, the large shipping companies would all be using them... do you know how much money a large shipping company would save if it didn't have to haul its boats out to re-paint the bottoms on a regular basis???
As a pro-seamen to be, i must say that 'large' shipping companies paint their ships also as a first layer of defense for corrosion (together wit zincs and ICCP).

Yes indeed they would save a lot of money.

From a scientifical POV i don't doubt that a certain frequency (ultrasonic) can stop biofouling in the water.

It isn't widespread because most sailors dont wish to spend a lot of money on unproven techniques (and there right).


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
bartvdv is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
High Tech vs traditional-Comments? Pangaea General Discussion (sailing related) 38 08-07-2007 01:07 AM
Spring Hull Cleaning Tom Wood Gear and Maintenance Articles 0 04-05-2004 08:00 PM
New Shine for an Old Hull Don Casey Gear and Maintenance Articles 0 01-08-2002 07:00 PM
Hull Speed Demystified Steve Colgate Learning to Sail Articles 0 06-10-2000 08:00 PM
Hull Speed Demystified Steve Colgate Buying a Boat Articles 0 06-10-2000 08:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome