Great Planes Piper J-3 Cub 60 Kit - GPMA0162 - Manual (Page 25)

A. Draw a centerline on the front of the leading edge. It
happens that a Bic ball point pen placed on a piece of
1/4" plywood and a piece of 1/32" plywood will add up to
the centerline. Confirm this and add cardstock shims
(playing cards work well) if necessary.
B. Draw a bevel guideline on the top of the aileron. The
Bic pen with no shim at all will draw a line close to
1/8" high.
C. Draw the bottom bevel line on the aileron. This time,
shim the pen with a piece of 3/32" scrap balsa. Check
the plans before cutting the bevel.
D. Cut the hinge slots in the wing and the ailerons.
F. Final sand the bevel to the guide lines with a sanding
block and 150-grit sandpaper.
D 10. Cut the hinge slots and trial fit the ailerons to the
wing, but do not glue in the hinges until after the wing
is covered.
D 11. Cut a 1/8" deep x 7/8" wide notch in the bottom of
each aileron leading edge to accept the 1/8" x 7/8" x 1"
plywood horn mounting plate.
D 12. Trial fit the 1/4" x 7/8" x 3/4" balsa horn mounting
block to the bottom of the aileron in the location indicated
on the plan. Bevel the block until the plywood control horn
mount will be flush with the adjacent rib when the mount is
placed on top of the block.
E. Carve the bevel to the guide lines. A razor plane
works best but a hobby knife will do the job too. Remove
a little material at a time and frequently inspect your
work as you proceed.
D 13. Using thick CA, glue the balsa mounting block to the
aileron base, then the plywood plate on top of the block.
Bevel the edge of the plywood plate to match the bevel of
the leading edge of the aileron.
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