SailNet Community - Reply to Topic

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > How much zinc is enough?
 Not a Member? 


Thread: How much zinc is enough? Reply to Thread
Title:
  

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

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

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:

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.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
10-17-2011 10:22 PM
TQA
Quote:
Originally Posted by Fstbttms View Post
Two is a very common arrangement, is cheap insurance and almost certainly not going to over-protect the boat.


Unless you have found evidence of corrosion there, probably no reason to add a zinc.
Thank you. Two propshaft zincs it shall be.
10-17-2011 02:08 PM
foggysail
Quote:
Originally Posted by boatpoker View Post
Ok Lets jam a piece of carbon against a piece of stainless steel so tightly that even humidity cannot penetrate .... now we spin the stainless at 2800RPM......

I think you could sell that idea to Bic .... don't think Yanmar would be interested.



I am beginning to think you don't know what your talking/writing about!


Shaft Brush

2436 - Shaft Brush

http://www.mgduff.co.uk/pdfs/commerc..._Earthing_.pdf

http://www.engineersparadise.com/six...0grounding.pdf
10-17-2011 12:09 PM
Fstbttms
Quote:
Originally Posted by TQA View Post
Is this enough ?

Should I fit 2 propshaft zincs ?
Two is a very common arrangement, is cheap insurance and almost certainly not going to over-protect the boat.

Quote:
Originally Posted by TQA View Post
Should I fit a separate zinc to the rudder bearing at the bottom of the skeg.
Unless you have found evidence of corrosion there, probably no reason to add a zinc.
10-17-2011 12:02 PM
TQA OK I have a lightish 30 year old 44 foot grp boat with the usual collection of thru hulls a large metal fitting at the base of the skeg hung rudder and a prop shaft with a P bracket.

When I bought the boat it came with a single doughnut zinc on the propshaft. This lasts a year although the one I have just taken off was ready to fall apart.

Is this enough ?

Should I fit 2 propshaft zincs ?

Should I fit a separate zinc to the rudder bearing at the bottom of the skeg.
10-17-2011 11:55 AM
Fstbttms
Quote:
Originally Posted by boatpoker View Post
...free advice from shade tree electricians can be costly and on rare occasions deadly.
On this we can agree.
10-17-2011 11:50 AM
Fstbttms
Quote:
Originally Posted by boatpoker View Post
current in the water equals ..... current in the water.
Nothing either you or Rifkin has said provides the slightest bit of evidence of the existence of marina-wide corrosion issues. Again, I suppose it may exist, but in my experience, the term "hot marina" is just another one of those things that boaters talk about but don't really know about. And that is a term I hear bandied about all the time. In 17 years of replacing zincs on boats in virtually every Bay Area marina, I have yet to see an honest-to-God "hot marina".
10-17-2011 11:44 AM
boatpoker The original point I was trying to make (apparently not well) to the OP was that this is an extremely complex issue and that free advice is worth what you pay for it. Unless one has certification in marine corrosion or NACE training, free advice from shade tree electricians can be costly and on rare occasions deadly.

This is my last word on this subject.
10-17-2011 11:37 AM
boatpoker
Quote:
Originally Posted by Fstbttms View Post
Yeah, I read that. What does that have to do with the supposed "hot" marina? In his discussion of electric shock drowning (almost entirely unheard of in saltwater marinas, BTW), he says nothing about corrosion.
current in the water equals ..... current in the water.
10-17-2011 11:18 AM
Fstbttms
Quote:
Originally Posted by boatpoker View Post
Go to Quality Marine Services, LLC

In the left hand column is a button entitled "Electric Shock Drowning".
Yeah, I read that. What does that have to do with the supposed "hot" marina? In his discussion of electric shock drowning (almost entirely unheard of in saltwater marinas, BTW), he says nothing about corrosion.
10-17-2011 11:03 AM
boatpoker
Quote:
Originally Posted by Fstbttms View Post
If he does, I can't find it. Maybe you'd be kind enough to quote him or link to the page of his web site where he discusses the "hot marina".
Go to Quality Marine Services, LLC

In the left hand column is a button entitled "Electric Shock Drowning".
This thread has more than 10 replies. Click here to review the whole thread.

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


All times are GMT -4. The time now is 06:02 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.