Fei Bao MB-339 Instruction Manual - page 10
10
tape wrapped around the cutter at the proper depth will help
prevent a mishap.
Roughen the surface of the control arm where it will glue into
the rudder with 100 grit sandpaper.
Tape around the slot with masking tape and apply a liberal
amount of Aeropoxy into the slot (
photo 16
).
photo 16 – Installation of control horns
Secure the hinges into the vertical stab and the control horn into
the rudder with Aeropoxy. Remove the masking tape and allow
to dry overnight. Make sure to check the vertical stab for any
glue marks or fingerprints before setting it aside.
Locate two 15mm bolts and large washers. Trial fit these in the
vertical stab mounting posts.
Insert the vertical stab into the aft section of the fuselage and
secure with the two bolts.
Install a servo extension of the proper length to reach your
receiver and secure the connection with a large piece of heat
shrink or tape.
Step 7: Horizontal Stabilizers
The horizontal stabs build up in a similar fashion to the vertical
stab. Repeat all steps, including the installation of the servos,
elevator hinges and control horn.
Before installing the servos, use a Matchmaker or equivalent to
center the servos and match the positions of the control arms.
If you are using JR Heavy Duty Arms and the positions don’t
match, try rotating one arm 180 degrees before deciding which
half of the arm to trim off.
If you are installing 8611 servos, you will need to trim the ply
mounting tabs and metal arms to get a good fit (
photo 17
).
photo 17 – elevator servo installation
You can make the horizontal stabs easier to remove if you install
the servo extension such that the servo plugs in at the fuse
joint.
Install the two carbon fiber spars through the aft fuse.
Find the 20mm horizontal stab mounting bolts and trial fit into
the metal threaded tabs.
Working carefully, enlarge the hole in the top of the aft fuse
such that the stab mounting bolt will sit flush with the top of the
fuse. Do not drill this hole straight through, but make it just
large enough for the head of the bolt. In the prototype, the