Fitting the Exo-Doubler
The Exo-Doubler is an essential component in the Mugi
Evo. The doubler featured has a total wrap-around
shape and improves greatly in strength on earlier
The exo doubler cut as per the Evo plans should be
folded along the central flute. To make this fold
simply crease the material along the intact flute
- do not cut out any material as you will weaken the
Score fold along the diagonal lines and your doubler
will be ready to fit.
The fitting technique described below refers to the
images lower down this page. Once again, clicking
a thumbnail image will enlarge it into the main image.
Mark the Fit
Dry fit your doubler to become acquainted with how
it fits the nose of your Mugi. The doubler should
meet the leading edge of the wing on both sides and
drape over the nose of your aircraft. When you've
found the best fitting position, hold the doubler
in place and mark the location on the nose of the
Mugi with a ballpen as shown below.
Check that in this position, when wrapped around the
nose, the doubler meets in the middle of the underside
of the Mugi. If so, and you're satisfied with the fit,
apply glue within the boundaries of your pen lines
and then stick the doubler to your wing. If the doubler
overlaps, trim to fit. If the doubler does not meet,
either adjust the position or forget about it and
live with the gap.
Turn your Mugi over and glue the doubler to the bottom
of the wing. Hold it firmly in place while it dries
and then, to finish off, tape from the nose the rear
of the doubler along the join between the two sides.
This should help to keep dirt and moisture out of
the twinwall during landings.