GREAT PLANES RV-4 Instruction Manual page 15

35. Turn the wing over on the bench so that you are
looking at the bottom of the wing. From the end of each of
the ribs measure back 1/2" [13mm] and draw a line across
the sheeting. Cut the sheeting on this line.
36. Using a sanding bar, bevel the sheeting to match
the ribs.
37. From leftover 3/32" [2.4mm] balsa sheeting, apply
balsa onto the upper wing skin from the root of the wing up
to WBS. When applying the balsa sheet it must be installed
cross grain. This will provide much more strength to the
trailing edge of the wing.
38. Sheet the area between WTE and WBS, gluing
3/32" [2.4mm] balsa sheet to the balsa block.
39. Locate the 5/8" x 1/4" x 18" [15.9 x 6 x 457mm]
balsa stick that is used for the CA hinge blocks. From the
18" stick cut six blocks 1-1/2" [38mm] long. Glue each of the
blocks in place inside the wing on the backside of the wing
trailing edge. Refer to your plan for the proper placement of
each of the blocks.
40. Locate the 1/4" x 3/4" x 30" [6 x 19 x 762mm] balsa
leading edge. On one end make a line 1/8" [3mm] from the
end, extending 3/8" [9mm] from the edge of the leading
edge. Cut this area away.
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