LETTERS TO THE EDITOR
disparity is that vessels equipped
with transformers do not utilize
the shore-supplied neutral, they
create their own within the
transformer and as such, the
typical 208/120-volt service is
not available. Because of this, if
the transformer was set to boost
based on the 208-volt input, up to
(approximately) 240 for instance,
the corresponding 120-volt service
would safely be increased from 104
to 120 volts.
GPO- 3 OR STAINLESS STEEL
GPO- 3 is a recommended material
for backing plates for seacocks, but
I have not seen it recommended for
any other backing plate uses. Given
its non-corrosive nature, workability,
and the fact that it is less expensive
than stainless steel, it would seem
that ½-inch GPO- 3 would be a good
choice for backing all sorts of deck
hardware, plus the occasional need
below the waterline.
Specifically, my rudder has a
bottom bearing whose shoe rests on
a skeg. The shoe is bolted through
the skeg and is backed with a piece
of ¼-inch stainless plate. Over the
years, the backing plate has seriously
corroded and now must be replaced.
Would GPO- 3 be a good choice in
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Without seeing the application
and loads imparted on it, it’s difficult
to say that a given thickness of
GPO can replace steel as a backing
plate. Generally, it is used more and
more often in place of steel and
aluminum as a means in which to
distribute loads for everything
from deck hardware to struts.
However, based on the description, it
sounds as if it’s possible that GPO
would be a good candidate for this
application with one exception. GPO-
3 is made using polyester resin, which
can over time interact with water
and lead to osmotic blistering. For
continuously submerged applications,
G10 Garolite is preferable. It is
epoxy, rather than polyester, and
glass-fiber based, thus impervious to
osmotic blistering. You might wish
to review its properties and then
determine what thickness would be
appropriate for the application.
passagemaker.com September 2011