Refer to this photo for the following four steps.
❏
1. Position the wing plan so the center section is over
your flat building board (or cut the center section from the
wing plan). Cover the plan with Plan Protector.
❏
2. Examine the 1/8" x 1/4" x 24" [3.2 x 6.4 x 610mm]
balsa sticks included in this kit (which will be used for the
spars). If any of the spars are bowed, pair them together and
install them in the wing so any bows present will cancel-out.
❏
3. Cut both
bottom spars
to the length shown on the
plan from two 1/8" x 1/4" x 24" [3.2 x 6.4 x 610mm] balsa
sticks. Pin the spars into position over the plan.
❏
4. If building the wing with ailerons, cut a 3/4" [19.1mm]
wide
bottom trailing edge sheet
from a 1/32" x 3" x 24" [.8
x 76 x 610mm] balsa sheet and pin it into position over the
plan. If
not
building the wing with ailerons, cut the bottom
trailing edge sheet to extend all the way to the trailing edge
of the wing (as indicated by the arrows in the photo).
❏
5. Mark the location of the center rib W1 on the spars and
trailing edge sheet.
❏
6. Cut the four pieces of the bottom center section sheeting
from a 1/32" x 3" x 15" [.8 x 76 x 380mm] balsa sheet. The
forward sheet should be cut approximately 1/8" [3.2mm]
oversize, so it can extend to the leading edge dowel. Glue the
sheeting to the spars and trailing edge sheet as shown.
❏
7. Note the vertical lines aft of the spar notches on both
laser-cut 1/16" [1.6mm] balsa ribs
W3
. These lines indicate
where a section of balsa is to be removed to accommodate
the 1/16" [1.6mm] polyhedral braces when it’s time to join
the wing panels. Use a straightedge and a ballpoint pen to
mark the same lines on the other side of one of the W3’s, so
the lines will be on the outside of both ribs when positioned
on the outer panels.
❏
8. Glue the laser cut ribs
W1
through
W3
to the spars and
bottom center sheeting using a small builder’s square to be
certain they are vertical. Be certain the W3’s are positioned
so the lines are on the outside.
❏
9.
Cut the
leading edge
from the 1/8" x 24" [3.2 x
610mm] dowel, then glue it into position.
❏
10. If building the wing
without
ailerons, glue the laser-
cut 1/16" [1.6mm] balsa
aileron ribs
to the bottom trailing
edge sheeting in alignment with the wing ribs.
Note:
The aileron ribs can be seen in step 2 on page 11
where they are being glued to the bottom aileron sheeting.
Build the Center Section
BUILD THE WING
8
