SailNet Community - View Single Post - Electrolysis/Corrosion on my Prop
View Single Post
Old 03-13-2006
Fstbttms's Avatar
Fstbttms Fstbttms is offline
I don't discuss my member
Join Date: Feb 2003
Location: Under a boat, in a marina, in the San Francisco Bay
Posts: 2,160
Thanks: 4
Thanked 25 Times in 25 Posts
Rep Power: 13
Fstbttms will become famous soon enough
Originally Posted by offline2004
Walking the yard I have noticed that several people have 2 sets on the shaft. Is this a case of more is better or and I simply going to have 2 sets of zincs deteriorate at the same pace as 1 set
In theory, if you have one zinc on the shaft and it lasts X months, two zincs will last 2X months. It is possible to over-zinc your boat but I think you would have to really load up for this to take place. Two zincs on the shaft is a common configuration. If you decide to hang a "fish" over the side, the inboard end must be in direct electrical contact with the item for which protection is intended. This usually means termination on the transmission or shaft itself. Only clip it to the backstay if your rig is bonded to the engine. Remember also that the zinc's physical distance from the shaft/prop will affect it's ability to provide protection. The proper solution is to have adequate zinc on the shaft.
Reply With Quote Share with Facebook