Mount The Wing - GREAT PLANES Piper J-3 Cub Instruction Manual

Mount the Wing

❏ 1. Bevel the ends of the 1/4" [6mm] Hardwood Wing
Dowels.Test fit the dowels into the wing, making sure they lock
into the holes inside the wing. Use 30-minute epoxy to glue the
dowels into the wing, leaving them protrude 5/8" [16mm].
❏ 2. Install the 1/4-20 Blind Nuts by drawing them up into
the wing nut plate with a 1/4-20 bolt and washer (not
included). Apply 30-minute epoxy to the prongs of the blind
nuts before drawing them up into the nut plate to secure
their positions.
❏ 3. Place the wing on the fuselage. Measure from the aft
center of the fuselage to one wing tip and record the
distance. Measure from the same point to the opposite wing
tip and compare it to the first measurement. If the
measurements are not the same, adjust the wing and
remeasure until they are equal. Place a mark on the wing
and fuselage so it can be repositioned accurately for the
following steps.
❏ 4. Remove the covering from the wing center section
where the wing bolts will pass through the wing.
❏ 5. Bolt the wing to the fuselage using the 1/4-20 x 2"
Nylon Bolts. Enlarge the holes if necessary to allow the
bolts to pass through the wing. Check the alignment of the
wing and enlarge the holes in the wing if necessary to allow
the wing to be shifted to match the alignment marks.
❏ 6. Remove the wing and center the Wing Bolt Plate on
the trailing edge of the wing. Trace around the plate with a
pencil. Use a fresh #11 blade to carefully cut through the
covering 1/16" [1.6mm] inside the lines. Do not cut the
wood under the covering! This will weaken the
structure and may cause failure in flight. Remove the
covering from the wing within the lines you cut. Use medium
CA to glue the plate to the wing. Drill the holes for the bolts
in the plate from the bottom of the wing.
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