Top Flite TOPA0220 - Manual (Page 25)

❏ F3. If you are installing fixed gear on your model,
prepare both W2 ribs as shown in the above sketch.
Glue the lightening hole forward of the spars back into
the rib. Remove the two pieces from the lightening hole
aft of the spars.
❏
F4. Glue a die-cut 1/8" [3.2mm] ply W2TD
doubler to each W2 with 6-minute epoxy. Make sure
to make a left and right assembly. Cut and remove
the balsa from the rib where there is a notch in
W2TD for the landing gear rail.
Important: Notice the orientation of the TE notch in
relation to the W2TD notch.
❏ F5. In the same manner, prepare the W3 and W4
ribs. Continue with step 9.
❏ 9. Cut the right wing plan along the dashed line
and tape it to your building board. Cover the plan with
Plan Protector or wax paper.
❏ ❏ 10. Locate a die-cut 3/32" [2.4mm] balsa spar
web. Working from the narrow end of the web, slide ribs
W2 thru W9 into position on the web. Twist each rib so
that it seats properly in the web. Be sure that the ply
doublers on W2, W3 and W4 are on the correct side.
Also be sure that the notch for the TE web/jig is facing
down when each rib is twisted into position.
❏ ❏ 11. Position a 1/8" x 1/4" x 24" [3.2 x 6.4 x 610mm]
basswood bottom spar over its location on the plan,
aligning the spar so that a little overhangs each end. Pin
the spar to the plan at the ends. Don’t stick your pins
through the spar as it will split the spar. Instead, stick
them into your building board over the spar in a
❏ R8. In the same manner, prepare both W4 ribs.
Remove the lightening holes from both W2 ribs.
❏ R7. Glue a die-cut 1/8" [3.2mm] ply W3R
doubler to each W3 using 6-minute epoxy. Make
sure to make a left and right assembly. Cut and
remove the balsa from the rib where the notches
are in W3R for the landing gear rails.
Important: Notice the orientation of the TE notch
in relation to the W3R notches.
❏ R6. If you are installing retracts (retractable
landing gear) on your model, prepare both W3
ribs as shown in the above sketch. Glue the
lightening hole forward of the spars into the rib.
Remove the two pieces from the lightening hole
aft of the spars.
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