Great Planes RV-4 Park Flyer Kit - GPMA0010 - Manual (Page 14)

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3. Test fit the wing halves together. With one wing half flat
on your building board, block-up the wing tip of the other
wing half so that it is 2-5/8" [67mm] off of your building
board. Use a bar sander to sand the center joint as
necessary until the wing halves fit together without any gap.
Note: Do not be concerned if your wing does not have
exactly 2-5/8" [67mm] dihedral. No adjustment is needed if
it is within 1/4" [6.4mm].
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4. When satisfied with the fit, glue the ply dihedral brace
into the left wing panel with medium CA. Be sure the
dihedral brace is securely glued to the two main spars. After
the CA has hardened, tack-glue the right wing panel to the
ply dihedral brace with a small drop of thin CA. Do not glue
the root ribs together yet. With one wing panel flat on your
building board and the wing tip of the other wing half
blocked up as before, check that you have the same
measurement as in the above step. When satisfied with the
fit, wick more thin CA along the dihedral brace, securely
gluing it to both main spars in the right wing panel.
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5. Align the trailing edges and glue them together with thin
CA. Glue the root ribs together from the spar to the trailing
edge by wicking thin CA between them. Glue the leading
edges and the rest of the root ribs together with thin CA.
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6. Sand the leading and trailing edges of the wing joint flush.
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7. Sheet the bottom of the center-section with a 1/32" x
3" x 15" [0.8 x 76 x 380mm] balsa sheet. If you are careful,
this can be done as a continuous strip across the full width
of the center-section, as shown in the above photo.
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8. Fill any dings and uneven areas on the wing with light
weight balsa filler. Sand the wing smooth in preparation
for covering.
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1. Using the drawings on the wing plan, follow the
procedure below to make a right aileron torque rod from
one of the .030" x 20" [.76 x 508mm] wires.
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A. Cut 1" [25mm] from one end of the .030" x 20" [.76
x 508mm] wire and clamp it in a vise. Make a loop near one
end of the remaining wire by pulling it around the wire
clamped in the vise.
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B. Cut the excess wire from the loop, then use the drawing
on the plan to make the next bend as shown in the photo.
Build the Ailerons
14