D 14 From a 1/16" x 3" x 24" balsa sheet, cut and glue
shear webs, perpendicular to the aft edge of the main spars
The shear webs must be glued securely to the main spars
D 15 Sand the top of the wing so that the spars, shear
webs and TE are flush with the top of the ribs.
We need to mount the top wing on the fuselage now to set
the location of ribs R- 8/9.
D 21 Test fit ribs R-8 in position between the LE and the
wing joiner Lightly sand the inside of the TE to allow ribs
R-9 to fit between the wing joiner and the TE The deeper
slots in the ribs for the bolt plates face the bottom Do not
glue the ribs to the wing
D 16 Mount the cabane to the fuselage with four
4-40 x 3/8" machine screws, eight #4 washers and four
4-40 x 3/8" nuts Install a #4 washer on a bolt, Insert the
bolt through the fuse and cabane and secure it with a #4
washer and 4-40 nut
D 17 Install a 6-32 x 2" machine screw from the bottom up
through the top of the forward cabane and a 6-32 x 1-1/2"
machine screw in the aft cabane Secure the screws to the
cabane with 6-32 nuts.
D 22 Use masking tape to hold the top bolt plates W-1 and
the bottom bolt plates W-2/3 together on ribs R-8 and R-9.
D 23 Insert the outer wing struts in the bottom wing.
Carefully install the top wing with the bolts in the cabane
inserted through the bolt plates and the outer wing struts
inserted in their slots Make sure the top wing is fully seated
on the nuts on top of the cabane.
D 18 Mount the aluminum cross braces to the cabane
with four 4-40 x 3/8" machine screws and 4-40 nuts
D 19. Install the bottom wing on the fuselage.
D 20 Enlarge the slots through ribs R-8 and R-9 to 5/32"
to allow the 6-32 machine screws to pass through
D 24 Secure the top wing to the cabane with two #6
washers and 6-32 lock nuts Make sure the outer wing struts
are seated against the bottom wing Measure the distance
from the fin to both wing tips Adjust the bolt plates and ribs
R-8 and R-9 until the distance is equal.
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