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bonding sys / shaft brush

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Tazling View Drop Down
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Joined: 16 Jan 2013
Location: Cortes Isl BC
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Posts: 23
Post Options Post Options   Quote Tazling Quote  Post ReplyReply Direct Link To This Post Topic: bonding sys / shaft brush
    Posted: 22 Aug 2013 at 1:49am
My JJT CO32 came with 2 zincs attached one on either side of the keel, with bolts through into the sump walls, and "mystery wires" leading off into the snakes' nest of hoses and wires heading aft.  I have a feeling that they are attached, eventually, to a shaft brush that rides on the very small exposed section of drive shaft between stuffing box and gearbox.

Question:  if I have (and I have!) attached a sturdy prop zinc externally, do I still need the shaft brush?  I have a long-standing distrust of bonding systems :-)  If my prop zinc is beefy and well attached, can I dispense with the keel zincs?  They don't seem to have been doing all that much for the prop anyway -- the bronze shows telltale pinkish freckles and mottling.

inquiring minds...

BTW, my CO32 squeaked past an Alberg 35 on Monday in an informal local race.  The air was light and fluky (going to weather, thank goodness for small mercies) and it was tetchy, gritted-teeth helming but eventually, slowly, despite getting a late start and having a quarter mile or so to catch up, I was ahead of my esteemed rival round the first mark.  That was a *good* day :-)  The A35 had a taller rig, more waterline, deep local knowledge, and better sails... so I am not sure what got me into the lead -- dumb luck in the lulls and puffs, or (I would like to think) better strategy, rigorously attentive steering, and a fine boat :-)  Hooray Contessa!
..... Bound is boatless (wo)man .....
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George Isted View Drop Down
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Post Options Post Options   Quote George Isted Quote  Post ReplyReply Direct Link To This Post Posted: 04 Sep 2013 at 12:21pm
Depending on how much metal there is in the water (marina mooring piles), some areas seem to need more anode protection than others.   To me it seems a bit of a black art and relates to shore power being earthed to the anodes also. 
 
Most of the racing boats do away with the hull anode but hang one over the side when moored up, I presume this is bonded to the underwater metal fittings.
 
I myself only have a prop anode that lasts around 18 months and no hull anode but the boat is not left connected to shore power.  The blakes seacocks that have been removed for inspection all seem to be in excellent condition so not been eaten away yet.
 
 
George Isted
Contessa 32 "Concerto"
Co32 Class Captain and Measurer.
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Conte View Drop Down
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Joined: 07 Dec 2012
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Post Options Post Options   Quote Conte Quote  Post ReplyReply Direct Link To This Post Posted: 11 Sep 2013 at 8:49pm
Hi all,
 Seacocks (mine are all in Marelon) and the engine apart, there is something else that needs to be connected to the anode?

Piero
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