Great Planes Ultimate 3D E-Performance ARF - GPMA1546 - Manual (Page 14)

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5. Install the 2x135mm rudder pushrod in the same manner.
Install the Top Wing
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1. Trim the covering that overlaps onto the root ribs of the
top wing panels. Leave the covering at the tops of the cabane
strut slots intact. Glue the 6x21mm wing joiner dowel
halfway into one of the top wing panels.
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2. Coat both root ribs of the top wing panels and the
protruding end of the wing joiner dowel with 30-minute epoxy.
Be careful not to get epoxy into the cabane strut slots!
Join the wing panels and use tape to hold them together
tightly while the epoxy cures. Use denatured alcohol to wipe
away any excess epoxy. A toothpick or something similar can
be used to scrape any epoxy that may have squeezed into
the cabane slots when the wing panels were joined.
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3. Trim the covering from interplane strut slots in the
bottom wing as well as the cabane slots in the fuselage.
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4. Test fi t the interplane struts into the slots in the bottom
wing. The wider end of the strut is the bottom end. Mark the
forward and aft end of the struts onto the wing. Trim away a
narrow strip of covering from between the marks you made
(approximately 5/64" [2mm] wide).