You should definitely worry about it. I am on Chesapeake and see
deterioration of zinc each season. Stray current at slip or transient
marinas contributes as does differences in values on the galvanic scale.
Sent from my iPhone
On Jun 10, 2009, at 8:41 PM, Derek Atkin <[email protected]> wrote:
In doing a little reading. My boat is in fresh water, in which case
zinc is not reccomended. Folks are talking about magnesium. Should I
even worry about it in the great lakes for a boat that spends 4
months in the water?
Derek.0
From: "Judith Blumhorst, DC" <[email protected]>
To: [email protected]
Sent: Wednesday, June 10, 2009 6:53:13 PM
Subject: Re: [IC27A] Zincs
Ditto what Bruce says.
I've got 2 streamlined collar anodes on the prop shaft and a 3 or 4"
diameter "rudder" anode on the strut.
The rudder anode looks like two discs, one on each side of the
strut. The discs are attached with a bolt through the strut.)
Don't obstuct the water flow into the cutlass bearing when you
attach the shaft anodes. Be sure to leave a 1/4" or 1/2" between
the shaft anode and the cutlass bearing.
On average, they last about 8 months, depending on what boats move
into the area.... the diver checks them every 4 months and replaces
them as indicated.
I'd recommend the anodes that erode from the outside surface
inward. It's easier to tell when they're almost consumed. They
have a small percentage of cadmiumin added to the alloy.
Fair winds,
Judy B
From: Bruce Horne <bho...@ecieng. com>
To: ic...@yahoogroups. com
Sent: Wednesday, June 10, 2009 2:39:21 PM
Subject: RE: [IC27A] Zincs
Hello:
I have one on the shaft but I’m thinking about putting one on the st
rut also. It’s getting pock marked. I’m thinking the flat
kind that power boaters use . I could drill and tap a hole to attac
h it. The rubber inside the cutlass bearing electrically isolates t
he strut from the shaft so the shaft zinc can’t protect the strut.
The bronze thru-hulls would be protected by a bonding wire, although
I don’t have one and they are in great shape for an old boat (and N
igel Calder doesn’t recommend bonding the thru-hulls - he states the
y will actually deteriorate faster if attached to a bonding wire.
From: ic...@yahoogroups. com [mailto:IC27A@ yahoogroups. com] On
Behalf Of Derek Atkin
Sent: Wednesday, June 10, 2009 5:04 PM
To: ic...@yahoogroups. com
Subject: [IC27A] Zincs
What is the usual compliment of zincs on a C27? I checked catalina
direct that they didn't have much in the way of parts. I want to be
sure I am not missing any when I splash the boat.
Thanks
Derek.
#4297
79 C27
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