Great Planes Piper J-3 Cub 40 Kit - GPMA0160 - Manual (Page 24)

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9. Test fit the two die-cut 1/8" balsa Aft Fuse Tops
(CUB4F05) together. Sand them if necessary to achieve a
good fit and glue them together as shown in the photo.
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10. Use the aft fuse top to help position the die-cut 3/32"
balsa Cabin Doublers (CUB4F08) as shown in the photo.
The aft edge of the vertical slot (where the arrow is pointing)
should be even with the aft edge of the cabin. Glue the
doublers in place with thin CA.
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11. Locate the die-cut 1/8" ply Former F1A (CUB4F04)
and the die-cut 1/8" ply Former F1B (CUB4F11). Securely
epoxy F1B to F1A so they are aligned with each other and
the punch marks on F1A are showing. The kit has two F1A
formers only one is used in the kit disregard the other.
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12. If you are going to use the engine mount supplied
with the kit, drill a 5/32" hole through the firewall at each of
the four engine mount punch marks. If you are going to use
a different mount, center it on the embossed lines and mark
and drill the mounting holes.
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13. Glue one of the 1/8" x 2-3/8" x 2-3/8" ply Firewall
Doublers (CUB4F18) to former F1B so that it is centered over
the engine mount holes as shown in the photo. After the glue
cures, drill the engine mount holes through the firewall doubler
as well. Note: There are two Firewall Doublers included in this
kit only one of them is used at this time (the other one may be
needed later depending on the size of your engine.
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14. Insert the #6-32 Blind Nuts (NUTS003) into the
engine mounting holes on the doubler. Tap the blind nuts in
place with a hammer. Apply epoxy or thick CA to the blind nut
flanges and the doubler to hold them in place. NOTE: Do not
allow the glue to enter the threaded portion of the blind nuts.
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15. Glue the die-cut 1/8" ply F2B (CUB4F10) to the die-cut
1/8" ply F2A (CUB4F10) as shown in the photo. It is important
to line up the wing dowel holes as precisely as possible. Drill
a 3/16" hole at each of the punch marks on F2A.
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16. Align the two die-cut 1/8" ply Wing Mounting Blocks
(CUB4F12) with each other and securely glue the two together.
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17. Drill a 3/16" hole at each of the punch marks on
formers F3, F4, and F5.
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