Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 26)

❏
8. Insert the top tab of the die-cut 1/8" ply Cabin Brace
(CUB4F12) into the notch at the bottom of former F2B.
Insert the die-cut 1/8" ply Top Tank Floor (TTF) (CUB4F09)
with the embossed “TTF” facing upward, rear tabs into the
top notches of former F2. Allow the cabin brace legs to key
into their notches in the top tank floor. Glue the top tank floor
at the F2 notches only. LTF and TTF lay on the ledges
formed by the fuselage doublers.
❏
9. Press the firewall all the way onto the tabs at the front
of both tank floors. Make sure it is properly seated on the
tabs as this sets the correct amount of right thrust. Glue the
firewall to the tank floors only.
❏
10. Use good, stout hardwood sticks and multiple rubber
bands to pull the fuse sides together. As you add rubber
bands the fuse sides will gradually come together until they
mate with F1. Make sure these parts fit together properly first,
trimming as necessary, then remove some of the bands, Mix
up some epoxy and apply it to the edges of the firewall and
tank floors and add bands to pull the sides back into place.
Wipe off any excess epoxy before it cures. Immediately
proceed to the next step.
❏
11. Go over all the joints, gluing them securely with medium
CA. Pay special attention to all glue joints that involve Former
F2. The arrows in the photo show the joints that require special
attention. Apply a fillet of 5-minute epoxy to the joint where the
Cabin Brace meets F2 and F2B. It is essential to have secure
glue joints in these areas, as these components form the
structure that holds the wing on. Avoid excessive buildup of
glue in the areas where the side windows will be installed. Trim
and sand off the tab at the top of the Cabin Brace where it
protrudes behind F2.
❏
12. Press the die-cut 1/8" ply Instrument Panel (CUB4F04)
into the slot on the top of the top tank floor. Hold it perpendicular
to the tank floor and glue it in place. Note: Two Instrument
Panels are included in this kit, only one is required.
❏
13. Cut three Stringers from the 3/16" x 3/16" x 24"
balsa stick (CUB4F14) to fit between the firewall and the
instrument panel. Glue them in place with thin CA.
26