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Subject: TWL: Electrolysis in Props
From: Michael Slater (mike@XXX.XXX)
Date: Mon Feb 03 2003 - 03:29:46 EST
Last year it was identified that the bonding on my 10 month old boat was
incomplete, and this was evidenced initially by the props being pink and
the blades slightly serrated on the edges. Inspection showed one bonding
wire not connected and the other loose!! The builders yard manager and
engineer witnessed this. The builder agreed to replace the props. There
had been a continuing saga of vibration issues and the builder had
agreed at my request to pull both shafts and send these with the props
to a local prop manufacturer for a report.
The report identified that the shafts were out of true and with the
severe corrosion at the prop ends, they condemned them. They identified
a number of faults in the props and corrected them. However they did not
comment on electrolysis in the props. The builder is now saying that he
therefore does not see the need to replace them.
So a couple of questions for the knowledgeable. 1. Is there any way I
can confirm the status of the props when no visible signs of
electrolysis remain. 2. Is it conceivable that due to the poor bonding
the shafts suffered severe corrosion, yet the lesser metal props
survived, even though there was visible evidence prior to the props
being redressed.
Unfortunately because the builders staff and I witnessed the problem,
and the builder agreed to replace them I did not take any photos, as I
thought there was no contention!!
Michael Slater
Sally Lillian
Falmouth UK
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