Re: [Amel Yacht Owners] Bonding

Kent Robertson

When everything is connected and working as designed, I am sure that no prop zinc is required.  However, when connections are loose/corroded and/or failures of equipment occur, severe damage can occur.  My prop shaft was damaged severely by electrolytic corrosion due to a combination of misconnections of the bonding system and a fault in a charger/inverter.  I will continue to use a prop zinc as long as I own my boat.


Kent Robertson
828-234-6819 voice/text

On Sep 23, 2016, at 10:44 AM, David Vogel dbv_au@... [amelyachtowners] <amelyachtowners@...> wrote:


Greets all,

Regarding the zinc on the prop, I've seen it mentioned that this is unnecessary due to the AMEL-style bonding system, with everything bonded to everything else.  However, as I currently understand it, the reason for the zinc on the prop, is because with a stainless prop shaft attached to the dissimilar bronze of the prop, and because this is underwater, this creates a galvanic couple.  So, to minimise the potential effects of this galvanic couple, it is best to place a zinc as close as possible to that underwater connection.   And also, minimise the opportunity for adverse effects should there be a failure, or deterioration, in the bonding circuit between shaft -to- transmission -to- bonding-circuit -to- rudder-post -to- rudder-zincs connections.

Happy to be corrected.  However, in the interim, I personally would be placing a zinc on the prop/shaft to take all possible steps to minimise the potential for galvanic corrosion of the shaft or the prop.



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