Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 30)

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4. Sand the bottom edges of the fuselage smooth with your
sanding block. Use the 3/32" x 2-3/4" x 24" balsa Bottom
Sheeting (CUB4F15) to sheet the bottom of the fuselage
from the grooved landing gear block forward and from the
landing gear block aft. NOTE: The sheeting is applied with the
grain running across the fuselage. Trim and sand the bottom
sheeting even with the fuselage sides and round off the
bottom corners as shown on the fuselage cross-sections.
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5. Cut a small opening in the bottom sheeting at the tail
where the antenna tube meets the fuselage bottom.
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1. Slide the Fin Post into the slot in the stabilizer and
check to make sure the fin will sit down against the stab. You
may have to cut a notch in the back edge of the fin LE to get
it to fit. Do not cut the stabilizer LE! Use a 90 degree triangle
(or two) to keep the fin perpendicular to the stab and the
stab TE. Securely glue the fin to the stab.
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2. Test fit the stab/fin assembly onto the fuselage as
shown in the photo. Trim or sand the slots if needed to get the
stab to sit down onto the stab base. Even though this
structure is self-aligning and should not require any
adjustment, we recommend temporarily mounting the wing
and verifying that the stab is straight with the wing. If there is
any slop in the fin slot, double check the alignment. Remove
the assembly and then use epoxy to securely glue it in place.
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3. Replace turtle deck former #4 and glue it in place.
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4. Install the remaining die-cut 1/8" turtle deck formers. TF1
(CUB4F09) is 1/8" ply and TF2 (CUB4F05) and TF3 (CUB4F03)
are 1/8" balsa. Glue them in place as shown in the photo.
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5. Cut the 3/16" x 18" Hardwood Dowels (DOWEL044)
to fit from the front edge of former F3 to the aft edge of top
deck former #4 and glue them in place. Use strapping tape
to hold them in place while the glue cures.
Mount Stabilizer and Fin
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