Hangar 9 J-3 Piper Cub Assembly Manual page 7

Section 2: Joining the Wing Halves
3. Next, check for the correct dihedral angle. Place the wing
on a large, flat surface with one wing panel resting on the
flat surface. The opposite wing tip should be exactly 2"
from the surface (see illustration below). If necessary,
sand the dihedral brace until this is achieved.
4. Mix up approximately three ounces of 30 minute epoxy.
Note: It is extremely important to use plenty of epoxy
when joining the wing halves.
5. Smear a generous amount of epoxy into the wing joiner
cavity of one wing half. A scrap piece of wood or mixing
stick is handy here.
6. Coat one half of the dihedral brace with epoxy up to the
pencil line drawn in Step 1. Note the orientation of the
V side of the dihedral brace; the V must face up. Install
the epoxy-coated side of the dihedral brace into the wing
joiner cavity of the wing half up to the center line, making
sure the V of the dihedral brace is positioned correctly.
2 inches
7. Apply a generous amount of epoxy into the wing cavity of
the other wing half.
8. Now apply epoxy to all sides of the exposed area of the
dihedral brace and uniformly coat both wing roots with
epoxy.
CONTINUED
7