PIPER J-3 CUB Kit Manual

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P.
Add the 1/16" sheet front planking.
Q. Put the 1/16"x1/8" capstrips on top of all ribs, including the aileron, except for the
two end W-2s and W-5.
R. Remove wing panel from the plan. The 1/8"x1/4" bottom front spar should be inset
into W-8 as was the top front spar. Install gussets made from die cut sheet scrap. In
addition to the gussets in the wing shown on the plan, it is recommended that scrap
gussets also be added to the corners of the ailerons. This will prevent covering
shrinkage from distorting the aileron end ribs. Note the proper direction of the grain
for the gussets as shown on the plan.
S. Use scrap plywood for the anchor blocks in the wing that provides places to fasten
the strut ends and holes in which to plug the strut braces. Block them out from the
spars with scrap balsa so that the plywood is flush with the surface wing.
T. The plywood mounting plate for the aileron control horn is installed flush with the
bottom surface. Install the aileron control horn before the wing is covered, epoxying
the nylon screw retainer securely to the inside of the plywood plate so that the
control horn may be removed to get it out of the way for the covering operation and
later re-installed.
U. The plywood mounting for the aileron bellcrank should be re-inforced with 1/4"
square scrap balsa at each end where it contacts the wing rib. You may wish to build
an opening from scrap balsa around the point where the R/C clevis link rod exits
from the wing surface between the bellcrank and control horn. This will make a
neater job and provide a place to fasten the covering.