GREAT PLANES J-3 Electri Cub Manuel d'instruction - Page 7
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BUILDING INSTRUCTIONS
Preparations
1. If you have not done so already, remove the major
parts of the kit from the box (wing halves, fuselage, tail
parts, etc...) and inspect them for damage. If any parts are
damaged or missing, contact Product Support at the
address or telephone number listed on page 6.
2. With a covering sock on your covering iron, set the
temperature to medium and tighten the covering. If
necessary, apply pressure to the sheeted areas to
thoroughly bond the covering to the wood. Hint: Poke three
or four pin holes in the covering between the ribs in the tail
surfaces; this will allow the hot air to escape when tightening
the covering.
Join the Wing
1. Glue the wing joiners together using 6-minute epoxy
and allow them to harden. Test fit the wing joiner into the
slots in the wing halves. Sand the joiner as required to get a
tight, secure fit that allows the wing panels to mate as nicely
as possible. Note: If the root ribs' angles aren't exactly the
same, that's OK. The difference can be filled with epoxy
when the wings are joined.
2. Cover your workbench with wax paper.
3. With the left wing flat on your workbench and the
center joint on the wax paper, raise the right wing tip 3-3/4"
[95mm] to properly set the dihedral. Block the raised right
wing at the desired height and make a mental note of the
position needed for it to maintain that dihedral. Slide the left
wing and joiner off the right wing.
4. Remove the joiner from the left wing. Cover the joiner,
left and right wing root ribs and pockets in the wing panels
with a moderate, but not excessive, amount of 30-minute
epoxy. Join the wing halves together. Ensure that the left
wing remains flat and the right wing tip is 3-3/4" [95mm]
from your workbench and can remain that way undisturbed
until the epoxy hardens. Hint: Use masking tape to hold the
wing together while the epoxy cures. Remove any excess
epoxy prior to hardening with a paper towel dampened with
denatured alcohol, being careful not to disturb the joint.
Install the Landing Gear
1. Push one plastic wheel collar on each axle, leaving
approximately 3/32" [2mm] between the wheel collar and
the bend.
2. Slide the wheels onto the axles and hold them in place
with the two remaining wheel collars. Make sure the wheels
spin freely.
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