Top Flite J-3 Piper Cub - Manual (Page 10)

Epoxy F-14 (PLY) and F-15 (PLY) in place, on top of the
fuselage longerons, against formers F-10 (PLY), F-11 (PLY)
and F-4 (PLY) and keyed into the tabs on F-10 (PLY) and
F-11 (PLY). Tape this assembly securely in place and allow
glue to dry completely.
Laminate and glue F-17 (PLY) to F-16 (1/4" balsa). Make a
similar second part but make it just the opposite so that you
have a right and left F-16/F-17 (PLY) assembly.
Glue these two assemblies in place against the insides of F-14
(PLY) and F-15 (PLY) with the F-17 (PLY) facing each other
in the cabin. Align and firmly clamp these assemblies until
completely dry.
13. With the 1/16" sheet balsa provided, cut and fit the "shelf"
that sits on the fuselage top longerons just in front of F-4
(PLY). Glue in place.
With the 1/4" balsa sheet provided, accurately measure, cut
and fit the top cabin sheeting in place from the back of F-10
(PLY) to the front of F-4 (PLY). Note cross-grain direction.
THE PIECES MUST FIT ACCURATELY TO ACHIEVE
THE MAXIMUM STRENGTH. Once satisfied with the fit,
epoxy these parts in place and allow to dry.
Carefully trim and fit the triangular cross-piece block that
sits on the front of F-10 (PLY) and between the F-14 (PLY)
and F-15 (PLY) cabin sides — see side view. Glue this block
in place. Next, we have provided one block with two radiused
ends. Using the top view on plan sheet No. 2, cut two top
forward wing blocks. Epoxy these two blocks in place against
the triangular block and F-14 (PLY) and F-15 (PLY). They
will be final shaped later.
14. Use a piece of scrap 1/4" sheet to rest on top of the two
F-19 stabilizer supports, to fill the stabilizer slot. Trial-fit
the fin in place as shown on the plans. Note that when
properly in place, R-1 contacts F-9 and the trailing edge of
the fin lines up with vertical end of the fuselage. Once satis-
fied, glue the fin in place against F-9 at the front and at the
rear, the small cross-hatched area of the fin trailing edge on
top of the F-19's (see side view of plans). Use pins and tape
to assure the fin is truly vertical to the fuselage. Allow to
dry completely.
Frame the left cabin side F-15 (PLY) windows with 1/8" x
1/4" stock provided. The 1/8" side fits against the plywood.
On the left side only the area on top of the fuselage longeron
from F-10 (PLY) to F-11 (PLY) and the two upright window
frames receive this material. On the right side, F-14 (PLY),
the upper door receives the same treatment except that it is
completely framed around its perimeter as well as the two
upright window frames.
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