Great Planes RV-4 Park Flyer Kit - GPMA0010 - Manual (Page 11)

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5. Starting at the wing tip, glue six laser-cut 1/16"
[1.6mm] balsa W2 ribs over the main spar, perpendicular to
the building board. Important: Pin the rear of the ribs firmly
to the TE shim.
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6. Temporarily place a sheet of 1/32" [0.8mm] balsa
sheeting on the plan 1/4" [6.4mm] aft of the spar as shown
in the above photo. This will space the W1 ribs properly on
the spar. Glue a laser-cut 1/16" [1.6mm] balsa W1 rib in
place over the main spar as shown in the photo.
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7. Position a W1 root rib in place over the main spar.
Use the die-cut 1/16" [1.6mm] dihedral gauge to set the rib
at the proper angle before gluing it to the main spar.
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8. Position the top 1/8" x 1/4" x 24" [3.2 x 6.4 x 610mm]
balsa main spar in the rib notches with one end flush with
the outside edge of the W1 root rib. Glue the spar to all of
the ribs except the W1 root rib. Make sure all ribs, except the
root rib, are perpendicular to the table as you glue each rib
to the top spar.
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9. Using the dihedral gauge, check that the root rib is still
at the correct angle. Glue the root rib to the top main spar.
Note: Save the dihedral gauge to set the angle of F5A.
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10. Cut one of the 1/8" x 24" [3.2 x 610mm] hardwood
dowels to length so that it fits in the notches at the front of
the wing ribs, from the root to the tip rib. Glue the dowel to
the ribs.
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11. Locate a 1/32" x 3/4" x 24" [.8 x 19 x 610mm] balsa
sheet. The sheet should fit in the notches at the trailing edge
of the wing ribs. When the wing is complete, it will blend with
the bottom trailing edge sheet when it is installed later. The
above sketch shows how the completed assembly will look.
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