Top Flite J-3 Piper Cub - Manual (Page 6)

28. Using a sanding block, bevel the wingtip from the 1/8" x
1/4" sheeting spar, forward thru the 5/16" sq. L.E. to pro-
vide seating for the 1/16" balsa L.E. bottom sheeting. Glue
and pin the L.E. sheet in place. Note that it is advisable to
lightly score the sheeting just outboard of the W-9 rib to
facilitate the slight compound curve required. Let this
assembly dry.
29. Locate and glue 1/16" thick parts W-15 (PLY), W-14 (PLY)
and both W-13 (PLY)'s in place per the plan. NOTE: be sure
to glue the W-15 (PLY) parts in place correctly to provide
exit of the threaded aileron pushrods from the bellcrank end.
30. Using the 1/16" balsa sheet provided, sheet the wing root
from the inboard W-4 rib thru the W-2/W-3 (PLY) rib noting
grain direction on plans. Glue all remaining wing and aileron
cap strips in place and allow to dry.
31. Remove the wing panels from the work surface. As before,
inspect them, remove any glue runs and make sure all joints
are properly glued. The panels can now be lightly sanded to
final shape with the exception of rounding the leading edges
to final shape. This will be done later. Locate and glue the
1/16" thick ply strut plate doublers W-15A (PLY) and W-14A
(PLY) in place on top of W-14 (PLY) and W-15 (PLY).
32. Use a razor or hobby saw to remove the excess sheeting, L.E.,
T.E. and spar stock from the root of each wing panel.
LIGHTLY sand the balance of this material flush with the
face of root rib W-2. Be careful to sand ONLY to the face of
this rib, not into it.
With a few exceptions, your wing panels are now complete. Pro-
ceed to the next construction phase of these instructions.
5
TAIL SURFACES
Accurate joints, complete glueing and a flat work surface are
essential to strong tail surfaces. Cover stabilizer and rudder area
of plan sheet 1 with Monokote backing material or Saran Wrap
before beginning construction of these parts.
STABILIZER
1. Glue and pin in place all die-cut S-1's, S-2's, S-3 , S-4's and
the 1/4" x 1/2" balsa trailing edge. Using the 3/32" x 1/4"
stock provided, cut to size and glue in place the "ribs". Do
not glue the 1/8" x 1/2" gussets in place yet.
1. Glue and pin in place all die-cut E-1's, E-2's, E-3's, E-4's and
the 1/4" x 1/2" leading and trailing edges from the stock
provided. Cut and glue in place the 3/32" x 1/4" "ribs".
Cut off a 3" length of 1/4" diameter dowel and epoxy in
place between the two elevator halves as shown on the plans.
2. When the stabilizer and elevator assemblies have dried, remove
them from the work surface. Inspect and clean-up each of the
glue joints. Using the 1/8" x 1/2" stock provided, carefully
make and install each of the gusset joint reinforcements, as
shown on the plans. Fit these to each joint, noting grain
direction and center them between the upper and lower
surfaces.
1. Glue and pin in place die-cut parts R-1, R-4 and the 1/4"
x 1/2" outline stock. Note on the plans that the bottom,
trailing edge piece of 1/4" x 1/2" wood has an "extension"
cut into it's shape. This area is shown as cross-hatched (////).
Also note that 1/4" square balsa is used at the top of the fin
to complete it's outline. Glue the 3/32" x 1/4" "ribs" in
place.
FIN
ELEVATORS