"Lou Parker" wrote in message
om...
In many area's on my wood structure it calls for a filler. Usually
spruce, but for no other reason but to fill a gap. These are not
structural in the least, only to fill (i.e. on top of the spar a 1/4"
strip of wood to keep the plywood skin from saging in between the wing
ribs). Has anyone used Balsa wood to accomplish this to save on
weight.

Some early fiberglass gliders use balsa as a filling in the wings and
mildew is an issue. I think that there is a procedure to chemically treat
the balsa inside the wing to kill it.

Vaughn