PassageMaker - September 2011

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 this application?

Richard Minton Columbus, Mississippi

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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.