|
|
20-12-2012, 05:35
|
#1
|
Registered User
Join Date: Oct 2005
Posts: 6,185
|
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.
|
|
|
20-12-2012, 05:59
|
#2
|
Registered User
Join Date: Mar 2007
Location: Cormorant Island, BC, Canada
Boat: Lancer 44 Motorsailer
Posts: 1,877
|
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.
|
|
|
20-12-2012, 06:13
|
#3
|
Senior Cruiser
Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 49,082
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Lancerbye
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?"
|
|
|
20-12-2012, 06:33
|
#4
|
Registered User
Join Date: Oct 2005
Posts: 6,185
|
Quote:
Originally Posted by GordMay
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.
|
|
|
20-12-2012, 07:19
|
#5
|
Hull Diver
Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,427
|
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.
|
|
|
20-12-2012, 07:37
|
#6
|
Registered User
Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
|
Re: Hanging The Fish Zinc In The Marina Trick
What problems are created with to many zincs?
|
|
|
20-12-2012, 07:40
|
#7
|
Hull Diver
Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,427
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Matt sachs
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.
|
|
|
20-12-2012, 07:48
|
#8
|
Registered User
Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
|
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?
|
|
|
20-12-2012, 07:57
|
#9
|
Hull Diver
Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,427
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Matt sachs
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?
|
|
|
20-12-2012, 08:44
|
#10
|
Registered User
Join Date: Oct 2007
Location: Lakewood Ranch, FLORIDA
Boat: Alden 50, Sarasota, Florida
Posts: 3,464
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Matt sachs
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.
|
|
|
20-12-2012, 09:18
|
#11
|
Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
|
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
|
|
|
20-12-2012, 10:42
|
#12
|
Registered User
Join Date: Jul 2010
Location: East Tennessee
Boat: 1989 50 ft Roberts
Posts: 859
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by fstbttms
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?
|
|
|
20-12-2012, 10:58
|
#13
|
Moderator
Join Date: Jul 2007
Boat: Bestevaer.
Posts: 14,678
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Matt sachs
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.
|
|
|
20-12-2012, 11:27
|
#14
|
Registered User
Join Date: Aug 2006
Location: Skagit City, WA
Posts: 25,453
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by Matt sachs
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
|
|
|
20-12-2012, 11:32
|
#15
|
Hull Diver
Join Date: Oct 2006
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 5,427
|
Re: Hanging The Fish Zinc In The Marina Trick
Quote:
Originally Posted by noelex 77
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.
|
|
|
|
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Rate This Thread |
Linear Mode
|
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
Advertise Here
Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
Vendor Spotlight |
|
|
|