As I write this, I am looking at a cross-section of an ASW-22 wing, taken from
a ship that has met with misfortune, It has styrofoam dams at the leading edge,
on both sides of the upper spar cap and at the forward edge of the drag spar.
These styrofoam dams were set just high enough to allow for a 10% excess of
glue (epoxy resin, chopped fibers, micro-balloons) that were trawled in from
the edge of one dam to the edge of the other dam. In this way, the construction
crew was 100% sure that the proper amount of glue had been spread along the
spar cap. When the upper skin was mated, all voids were filled and the excess
10% of resin was forced out each side into the styrofoam dams.
The inside of this wing is a work of art. I would expect nothing less from all
sailplane manufactures.
JJ Sinclair