GREAT PLANES Rapture 40 Instruction Manual page 13

12. Fit, but do not glue rib R1 into position. Place a
leftover piece of 3/32" [2.4mm] balsa on the plan against the
bottom spar.
13. Fit, but do not glue the die-cut 3/32" [2.4mm] balsa
shear web (DG) between R1 and R2. Make sure the shear
web is installed with the angled end contacting R1 so that
the top of R1 is slanting outward toward the wing tip. Glue
R1 to the top and bottom spars only.
14. Remove the shear web. Flip it over, then use it to
check the angle of R1 as you glue it to the forward and aft
dowel plates.
15. Using the 3/32" [2.4mm] balsa shim to raise the
shear web from the plan, glue the shear web to the back of
the spars. Use the same procedure to glue another shear
web to the front of the spars. Be careful not to inadvertently
glue the leftover balsa shim to the spars or shear web.
16. Lightly sand the front of the dowel plates to trim
any ribs that may be protruding.
Refer to this photo for the following three steps.
17. Glue the 3/8" x 3/4" x 30" [2.4 x 19 x 760mm] balsa
wing trailing edge into position. Note that the trailing edge
should be centered vertically on all the ribs. This means that
the top and bottom of all the R3 ribs will be even with the top
and bottom of the trailing edge, but there will be a 3/32"
[2.4mm] difference between the top and bottom of the other
ribs and the top and bottom of the trailing edge.
18. Use a hobby knife to separate the 30" [760mm]
shaped leading edges from each other as shown in
the sketch.
19. Glue one of the leading edges into position. Be certain
the leading edge is centered vertically on all the ribs and the
dowel plate. Note that the tip of the leading edge should extend
approximately 1-1/2" [38mm] beyond R3 at the wing tip.
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