Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 25-05-2010, 23:11   #1
CF Adviser
 
Bash's Avatar

Cruisers Forum Supporter

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Shaft Zincs on Year-Round Cruisers

Okay. So let's say that you plan to haul the boat out every two years for fresh bottom paint. And let's say that you go through a zinc ever six months. So, rather than put on a single shaft zinc and carry three spares aboard, wouldn't it be better just to install four zincs on the shaft and assume that you've got it covered until the next haul-out?

Let's assume that you're planning to dive the hull periodically and make certain that the zincs are holding up.

What am I missing here?
__________________

__________________
cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 25-05-2010, 23:49   #2
Registered User
 
Stillraining's Avatar

Join Date: Oct 2008
Location: Puget Sound
Boat: Irwin 41 CC Ketch
Posts: 2,876
I run two at a time FWIW.... and they both get ate up the same amount and are needing changed in as few as 3 months.

Not enough water time with my boat yet to know if I have stray current issues.
__________________

__________________
"Go simple, go large!".

Relationships are everything to me...everything else in life is just a tool to enhance them.
Stillraining is offline   Reply With Quote
Old 26-05-2010, 02:06   #3
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
Too much zinc can cause problems, but how much is too much?
Putting more zincs is certainly better than having none, but 4 may be a bit too much if they are large particularly for a non metal boat.
I have 3 on the propshaft of my aluminium boat and usually only need change one at hallout.
__________________
noelex 77 is offline   Reply With Quote
Old 26-05-2010, 03:41   #4
Moderator
 
Hudson Force's Avatar

Cruisers Forum Supporter

Join Date: Nov 2008
Location: Lived aboard & cruised for 45 years,- now on a chair in my walk-in closet.
Boat: Morgan OI 413 1973 - Aythya
Posts: 7,894
Images: 1
I have space to fit one 2 1/2" shaft zinc that is fitted with the use of an allen wrench. It's not difficult for me to free dive to clean the shaft space;...up for a breath......place the zinc with a loose first threading;.... up for a breath.....and return to tighten the allen bolts. Take care and joy, Aythya crew
__________________
Hudson Force is offline   Reply With Quote
Old 26-05-2010, 04:08   #5
Senior Cruiser
 
Vasco's Avatar

Cruisers Forum Supporter

Join Date: Apr 2004
Location: Toronto
Boat: CS36Merlin, "La Belle Aurore" Ben393 "Breathless"
Posts: 7,140
Changing zincs is one of the easier boat jobs. Just hold your breath. Mine usually lasts four to five months.
__________________
Rick I
Toronto in summer, Bahamas in winter.
http://groups.yahoo.com/group/beneteau393/
Vasco is offline   Reply With Quote
Old 26-05-2010, 06:20   #6
Registered User

Join Date: Dec 2008
Location: California
Boat: Catalina 30
Posts: 103
Send a message via Yahoo to anjinsan
Mind if I throw in a question here? Helping a friend, looking for the zinc in his heat exchanger pm a Yanmar 3 cylinder diesel. Anyone know where its hidden? On my universal, its a pencil zinc with a threaded bronze cap attached. It screws right into the side of the heat exchanger. Cant find anything on his Yanmar...Thanks for your help in Advance.
__________________
anjinsan is offline   Reply With Quote
Old 26-05-2010, 06:49   #7
Moderator Emeritus
 
GordMay's Avatar

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 31,592
Images: 240
Quote:
Originally Posted by anjinsan View Post
... looking for the zinc in his heat exchanger pm a Yanmar 3 cylinder diesel. Anyone know where its hidden? ...
Don't think Yanmar uses zincs.
__________________
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 26-05-2010, 07:02   #8
Eternal Member
 
capt_douglas's Avatar

Join Date: May 2003
Location: Ft. Lauderdale, FL
Boat: Vancouver 36 cutter????
Posts: 620
Send a message via Skype™ to capt_douglas
I follow CaptForce on the shaft zinc replacement. The process can be a bit intimidating the first time but after that it's fairly straightforward.

The only ones I don't replace underwater are the zinc on the end of the propeller and the Dynaplate.
__________________
Capt. Douglas Abbott
USCG/MCA IV/M.I./C.I. 500-ton Oceans
capt_douglas is offline   Reply With Quote
Old 26-05-2010, 07:03   #9
Registered User

Join Date: Dec 2008
Location: California
Boat: Catalina 30
Posts: 103
Send a message via Yahoo to anjinsan
that would explain it. But he does get a lot of debris build up in his salt water exhaust.

Thanks Gord.
__________________
anjinsan is offline   Reply With Quote
Old 26-05-2010, 07:14   #10
Registered User
 
S/V_Surya's Avatar

Join Date: Mar 2009
Location: Sasafra river,MD
Boat: gulfstar ketch 41 Surya
Posts: 658
Zinc usage I do not think is extended by putting more zinc’s on. It may help extend the life but as we all know dissimilar metals in contact with each other cause the current. Adding more metal won't help. I read an article on this some place a long time ago. Will check around and see what I can find.
__________________
S/V_Surya is offline   Reply With Quote
Old 26-05-2010, 07:43   #11
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
Quote:
Originally Posted by S/V_Surya View Post
Zinc usage I do not think is extended by putting more zinc’s on.
In fact, it is. Generally speaking, if one zinc lasts X months, then two zincs will last 2X months. However, there is a point of diminishing returns and it is absolutely possible to overzinc. Impossible to say from an office chair if Bash would reach this point with 4 shaft zincs, but it is possible to say that 4 shaft zincs is quite unusual.
__________________
fstbttms is offline   Reply With Quote
Old 26-05-2010, 09:12   #12
Moderator Emeritus
 
hummingway's Avatar

Cruisers Forum Supporter

Join Date: Jan 2010
Location: Gabriola Island & Victoria, British Columbia
Boat: Cooper 416 Honeysuckle
Posts: 6,933
Images: 5
In addition to two zincs on the shaft I've run a wire a from my engine to the cockpit combing and attached an old zinc to it that goes over the side when not moving. There's a few folks doing this at my current marina. The thinking is that it slows down the loss of the more expensive zinc on the prop shaft.
__________________
“We are the universe contemplating itself” - Carl Sagan

hummingway is offline   Reply With Quote
Old 26-05-2010, 09:21   #13
Senior Cruiser
 
Sailmonkey's Avatar

Cruisers Forum Supporter

Join Date: Sep 2009
Location: Houston
Boat: '76 Allied Seawind II, 32'
Posts: 5,786
I've got a hell of a time fitting one zinc much less four!!
__________________

__________________
Sailmonkey is online now   Reply With Quote
Reply

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Strut, Shaft, Shaft Log, Engine Alignment KestrelBuck Engines and Propulsion Systems 24 04-04-2011 00:14
Too Hot to Liveaboard Year-'Round in Florida? Cherise Liveaboard's Forum 65 04-08-2010 20:55
Economic Crash = Less Cruisers this Year? virginia boy General Sailing Forum 12 02-04-2010 20:08
Which bay has more year round sailing opportunities, San Francisco or Chesapeake? Dagdason Fishing, Recreation & Fun 16 05-10-2008 14:35
YouTube video on shaft packing 5 " shaft Roy M Propellers & Drive Systems 5 24-07-2008 10:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 15:27.


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.