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 versions.

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 structure.
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.

Glue Topside

Check that in this position, when wrapped around the nose, the doubler meets in the middle of the underside of the Mugi. If so, ad 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.

Glue Bottomside

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.