9
❑
While holding the two wing panels together firmly, make sure that both wing panels are lined up at both the leading and
the trailing edges, then look carefully at the center-section joint: the wing panels should fit together tightly with few or no
gaps in the joint.
☞
If the wing panels do not fit together properly, remove the wing joiner and use 220 grit sandpaper with a sanding
block to lightly sand the edges and tips of the wing joiner, until you are satisfied with the fit.
❑
Carefully slide both wing panels together with the wing
joiner temporarily installed (without using glue).
✦
✦
✦
✦
✦
IMPORTANT
✦
✦
✦
✦
✦
When the wing joiner is installed, it should
not fit tightly into the wing panels. It should actually be
slightly loose. This will ensure that when you glue the wing
joiner into place epoxy can get into the joints between the
wing joiner and the joiner box. If the wing joiner fits too
tightly, the epoxy will be pushed out of the joints when you
slide the wing joiner into the wing, leaving no glue to secure
it into place.
❑
When satisfied with the fit, pull the wing panels apart and
remove the wing joiner.
❑
Apply a long strip of masking tape to the top and bottom
edges of the root rib on each wing panel.
☞
The masking tape will prevent excess epoxy from getting
onto the wing panels when you join them.
STEP 2: JOINING THE WING PANELS
❑
Mix a generous amount of 30 minute epoxy. Working with only one wing panel for now, apply a thin layer of epoxy inside
the wing joiner box and to only half of the wing joiner. Make sure to cover the top and bottom, as well as the sides, and use
enough epoxy to fill any gaps.
✦
✦
✦
✦
✦
WARNING
✦
✦
✦
✦
✦
Use only 30 or 45 minute epoxy to install the wing joiner and to join the wing panels together.
Do not
use 5 minute epoxy. It is not strong enough.
❑
Slide the wing joiner into the wing panel up to its centerline. Quickly remove any excess epoxy, using a paper towel and
rubbing alcohol, and allow the epoxy to set up before proceeding.
❑
After the epoxy has set up, test-fit both wing panels together again to double-check that they still fit together properly.
Check the leading and trailing edges, too. It's important that they be even with each other.
❑
Mix a generous amount of 30 minute epoxy and apply a thin layer to the exposed half of the wing joiner, the inside of the
wing joiner box in the second wing panel, and to the
entire surface of BOTH root ribs
. Make sure to use enough epoxy
to fill any gaps.
✦
✦
✦
✦
✦
IMPORTANT
✦
✦
✦
✦
✦
It is of the utmost importance to the integrity of the wing center-section joint that you apply a generous
amount of epoxy to
both root ribs
and to the wing joiner. Not using enough epoxy can result in wing failure during flight.
❑
Slide the two wing panels together and realign them. Quickly wipe away any excess epoxy, using a paper towel and
rubbing alcohol, and use pieces of masking tape to hold the two wing panels aligned until the epoxy fully cures.
Continued On Next Page
☛
☛
☛
☛
☛
