Great Planes RV-4 Park Flyer Kit - GPMA0010 - Manual (Page 12)

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12. Glue the top trailing edge sheet to the top of the
wing ribs.
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13. From a 1/32" x 3" x 15" [0.8 x 76 x 380mm] balsa
sheet, cut and glue shear webs, with the grain running
vertically, to the top and bottom spars in the locations shown
on the plan. It is not necessary for the shear webs to be
glued to the ribs at this time, but make sure they are glued
securely to the wing spars. Do not install shear webs in
the rib bay between the W1 ribs.
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14. From a 1/32" x 3" x 15" [0.8 x 76 x 380mm] balsa
sheet, cut pieces to make the top center sheeting to fit
between the wing spar and trailing edge sheet and between
the wing spar and the leading edge dowel. Remove any pins
that may be under the area to be sheeted. When satisfied
with the fit, apply medium CA to the top of the W1 ribs and
press the sheeting in place.
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15. Carefully sand the top center sheeting flush with
the wing spar, leading edge dowel and trailing edge sheet.
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16. Remove the wing from your building board and
carefully sand off any glue blobs. Cut and sand the wing
spars, leading edge and trailing edge sheeting flush with the
wing tip rib and root rib.
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17. Reinforce any glue joints that look weak. Glue the
shear webs to each rib. Remember, use glue sparingly to
minimize weight gain.
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18. Glue a 1/32" x 3/4" x 24" [.8 x 19 x 610mm] balsa
bottom trailing edge sheet to the bottom of the wing ribs
and to the top trailing edge sheet. Trim the sheet even with
the tip and root ribs.
Before proceeding, read steps 19 through 25 to become
familiar with how the wing tip will be installed.
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19. Prepare the laser-cut 1/16" [1.6mm] balsa wing tip
by carefully bending the forward part of the tip along the
embossed lines. You must do this gently to avoid breaking
part of the tip off. Do not bend along the two short lines that
are used to align the tip with the top wing spar.
Caution: On the left wing tip the embossed lines should be
on top of the wing tip. On the right wing tip the embossed
lines should be on the bottom of the wing tip. Hold the tip
against the wing to determine which way to bend for the
wing tip you are doing!
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