Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 20-12-2012, 06:35   #1
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Hanging The Fish Zinc In The Marina Trick

Any solid thoughts on this? I've seen folks doing it here and there and especially when hopping into a new marina I'd rather burn up a disposable zinc than something more critical like one of my rudder strap zincs.
__________________

__________________
rebel heart is offline   Reply With Quote
Old 20-12-2012, 06:59   #2
Senior Cruiser
 
Lancerbye's Avatar

Cruisers Forum Supporter

Join Date: Mar 2007
Location: Ladysmith,BC, Vancouver Island , Canada
Boat: Lancer 44 Motorsailer
Posts: 1,757
Images: 32
Re: Hanging The Fish Zinc In The Marina Trick

Common practice here. I connect mine to the backstay chainplate as it is bonded to the common bond point. Saves my shaft zincs.
__________________

__________________
The basis of accomplishment is in never quitting
Mengzi Meng-tse
Lancerbye is offline   Reply With Quote
Old 20-12-2012, 07:13   #3
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,580
Images: 240
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Lancerbye View Post
Common practice here. I connect mine to the backstay chainplate as it is bonded to the common bond point. Saves my shaft zincs.
Indeed.
To complete the electrical circuit, the portable zinc must be electrically connected to the items they are intended to protect.
__________________
Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"



GordMay is offline   Reply With Quote
Old 20-12-2012, 07:33   #4
Senior Cruiser
 
rebel heart's Avatar

Cruisers Forum Supporter

Join Date: Oct 2005
Posts: 6,190
Images: 3
Quote:
Originally Posted by GordMay View Post
Indeed.
To complete the electrical circuit, the portable zinc must be electrically connected to the items they are intended to protect.
Is there a preferred model? I've seen guys rocking a big fish version.
__________________
rebel heart is offline   Reply With Quote
Old 20-12-2012, 08:19   #5
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Hanging The Fish Zinc In The Marina Trick

A zinc is a zinc is a zinc. Ain't nothin' special about the guppy. Remember that it is possible to over-zinc. Arbitrarily adding anodes when there may not be a problem necessitating them can be a bad idea.
__________________
fstbttms is offline   Reply With Quote
Old 20-12-2012, 08:37   #6
Registered User
 
Matt sachs's Avatar

Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
Images: 18
Re: Hanging The Fish Zinc In The Marina Trick

What problems are created with to many zincs?
__________________
Matt sachs is offline   Reply With Quote
Old 20-12-2012, 08:40   #7
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Matt sachs View Post
What problems are created with to many zincs?
For one thing, you can create a "burn-back" of the anti fouling paint around metal fittings on the hull.
__________________
fstbttms is offline   Reply With Quote
Old 20-12-2012, 08:48   #8
Registered User
 
Matt sachs's Avatar

Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
Images: 18
Re: Hanging The Fish Zinc In The Marina Trick

Good to know. I have 2 on the rudder 2 on the keel near the prop shaft, and 2 on the keel near the leading edge. How dose one determine where they should be?
__________________
Matt sachs is offline   Reply With Quote
Old 20-12-2012, 08:57   #9
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Matt sachs View Post
Good to know. I have 2 on the rudder 2 on the keel near the prop shaft, and 2 on the keel near the leading edge. How dose one determine where they should be?
Underwater metal parts needing corrosion protection should be electrically bonded to an anode. This typically determines where anodes should be located.

You have nothing protecting your shaft & prop? Also, are you in freshwater?
__________________
fstbttms is offline   Reply With Quote
Old 20-12-2012, 09:44   #10
Registered User
 
S/V Illusion's Avatar

Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 1,693
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Matt sachs View Post
What problems are created with to many zincs?
Every time you add a zinc, you are effectively adding a battery albeit small. Too many is counterproductive as the 'batter' becomes stronger creating problems where none previously existed.

Too many people connect a guppy zinc to the chainplates thinking everything is interconnected. On it's face, that is true but fails to consider all the connections between the chainplate and what the guppy is intended to protect. Every connection creates a resistance decreasing the efficacy of the guppy.

although difficult, it is best to ensure minimal or no connections. The wire itself has an inherent resistance so you want the shortest cleanest path.
__________________
S/V Illusion is offline   Reply With Quote
Old 20-12-2012, 10:18   #11
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Hanging The Fish Zinc In The Marina Trick

Quite a few people do it up here inthe PNW. Seems to work great for those is marinas that make metal disappear fast!
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 20-12-2012, 11:42   #12
Registered User
 
Matt sachs's Avatar

Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
Images: 18
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by fstbttms View Post
Underwater metal parts needing corrosion protection should be electrically bonded to an anode. This typically determines where anodes should be located.

You have nothing protecting your shaft & prop? Also, are you in freshwater?

The boat is on stands for the refit. I plan to use it in both fresh and salt. The prop shaft is 44mm stainless, the zincs are near the shaft, but electrically its a long way from the zinc thru the hull to the engine and tranny and then to the shaft. The cutlass is rubber lined so I would guess it acts as an insulator between the shaft and shaft log/ hull. Am I over thinking this? Should the zinc be on the shaft?
__________________
Matt sachs is offline   Reply With Quote
Old 20-12-2012, 11:58   #13
Moderator
 
noelex 77's Avatar

Cruisers Forum Supporter

Join Date: Jul 2007
Location: Living on dirt waiting for our new yacht to be built.
Boat: Half built Bestevaer.
Posts: 10,619
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Matt sachs View Post
The boat is on stands for the refit. I plan to use it in both fresh and salt. The prop shaft is 44mm stainless, the zincs are near the shaft, but electrically its a long way from the zinc thru the hull to the engine and tranny and then to the shaft. The cutlass is rubber lined so I would guess it acts as an insulator between the shaft and shaft log/ hull. Am I over thinking this? Should the zinc be on the shaft?
Be careful with zinc in fresh water. Zinc quickly develops a coating in fresh water that prevents it working even when you go back to salt water.
You can sand the the zinc and restore is conductivity, but this means a dive.
An aluminium anode may be a better choice for your mixed salt/fresh water use.
__________________
noelex 77 is offline   Reply With Quote
Old 20-12-2012, 12:27   #14
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by Matt sachs View Post
The boat is on stands for the refit. I plan to use it in both fresh and salt. The prop shaft is 44mm stainless, the zincs are near the shaft, but electrically its a long way from the zinc thru the hull to the engine and tranny and then to the shaft. The cutlass is rubber lined so I would guess it acts as an insulator between the shaft and shaft log/ hull. Am I over thinking this? Should the zinc be on the shaft?
Yes, you should have a zinc on the shaft or the prop if setup that way.
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 20-12-2012, 12:32   #15
Marine Service Provider
 
fstbttms's Avatar

Cruisers Forum Supporter

Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 3,594
Re: Hanging The Fish Zinc In The Marina Trick

Quote:
Originally Posted by noelex 77 View Post
Be careful with zinc in fresh water. Zinc quickly develops a coating in fresh water that prevents it working even when you go back to salt water.
You can sand the the zinc and restore is conductivity, but this means a dive.
An aluminium anode may be a better choice for your mixed salt/fresh water use.
__________________

__________________
fstbttms is offline   Reply With Quote
Reply

Tags
fish

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:37.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.