GREAT PLANES RV-4 Instruction Manual page 21

2. Trial fit the dihedral brace into the wing by inserting it
into the left wing panel and then twisting it into position
between the wing spars.
3. Slide and twist the right wing panel onto the other end
of the dihedral brace to check the fit of the two wing panels.
4. When you are satisfied with the fit, glue the dihedral
brace to both wing panels with 30 minute epoxy. Be sure to
apply glue to the root ribs of both wing panels as well. Clamp
the entire wing assembly together and allow the glue to cure.
5. Now that the wing panels have been joined, use the
leftover 3/32" x 4" x 24" [2.4 x 102 x 610mm] balsa sheeting
to sheet the top and bottom center section of the wing.
6. At the location shown on the plans, cut two 1/2" [13mm]
holes in the top of the wing for the aileron and flap servo leads
to exit the wing.
7. Locate the die-cut 1/8" [3mm] plywood servo tray
support (STS) and the die-cut 1/8" [3mm] plywood servo
tray (ST).
8. Assemble the servo tray as shown. If you are using
flaps in your model you will need to assemble four servo
trays. If you are only going to have ailerons on your airplane
you will need to assemble two.
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