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We do this for Glasairs, but this is a fiberglass airplane. Al and Graphite
are on opposite ends of the galvanic chart; this may not be important with
laminated graphite but I assume they are very reactive in the presence of
moisture.

The Glasair calls for Al strips as doublers behind piano hinges. The
procedure is to rough up the strip then bond it to the opposite side of the
structure and fillet/smooth the edge transition. Apply two laminates over
that with a 1" margin. The riveting happens when attaching the hinge and it
results in little round delaminated areas around the rivet holes. I always
use a squeezer in these applications -- much easier. If you're going to
rivet the strip, I doubt bonding with laminates is even necessary, but I
would prime and protect the galvanic junction. Using glue on the rivets is
superfluous.

I guess it really depends on what you need the metal for. Perhaps a
different (passive) type of metal is required or simply additional graphite
laminates to stiffen the structure?

Regards
Theo
Super II-RG

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