Great Planes RV-4 40 Kit - GPMA0180 - Manual (Page 13)

❏ ❏ 22. Sheet the top of the wing between the outboard W2 ribs
from leftover 3/32" x 4" x 30" [2.4 x 102 x 762mm] balsa sheet.
❏ ❏ 23. Locate the 5/8" x 1-3/4" x 7" [15.9 x 44 x 178mm]
balsa block. Cut it into two 3-1/2" [89mm] long pieces.
❏ ❏ 24. Fit one of the balsa blocks between rib W1 and W2
at the trailing edge of the rib.
❏ ❏ 25. On the block make a mark 1/8" [3mm] from the
end. Draw a line from that mark to the corner as shown in
the photograph.
❏ ❏ 26. Sand the end of the block to the line you just made.
❏ ❏ 27. From the end of the block where you sanded the
taper into the block, measure forward 3/4" [19mm] from the
leading edge and draw a line across the block.
❏ ❏ 28. Locate the die-cut 1/8" plywood WBS. On each end
measure in 1/8" [3mm] and draw a line across WBS.
❏ ❏ 29. From the line out to the edge, sand the plywood to
a thickness of 3/32" [2.4mm].
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