CARF-Models Sukhoi SU-31
13
Rudder servos
Make up the Rudder tray from the
milled carbon-plywood parts
supplied. Prepare all joints by
sanding, and assemble as shown,
using thin CA to secure all the tabs
and slots. Cut small pieces of
plywood from the strip supplied and
epoxy onto the bottom of all the
servo rails. Finally reinforce all joints
with epoxy and micro-balloons
mixture. Drill the 2mm Ø holes for
the servo mounting screws before
gluing the assembly into the fuselage
- it’s much easier!
The rudder tray is supported on 2
carbon-balsa formers; the rear of the
mount goes into the center bulkhead
right behind the canopy opening.
Prepare the inside surface of the
fuselage carefully, and glue the
complete assembly in place with
epoxy and micro balloons mixture,
with a nice fillet on all joints. Install
the 3 servos into the rudder tray
using the 2.9mm Ø x 13mm screws
supplied, with the servo output shafts
towards the tail of the plane. If you
are going to use the supplied
phenolic servo arms, we recommend
you bolt them to metal servo wheels.
An alternative is to use SWB double
lock arms. Two 3”arms and one 4”
offset arm. Plug all three servos into
the receiver and power them up.
Install the servo arms as close to
parallel as possible. Use the sub
trim to finish the alignment so they
are perfectly parallel to the servo.
Use the provided 3mm threaded rod
to fabricate the connecting linkage
and hook all three servos together.
Make sure there is no servo buzz
when finished. Note Photo is from a
different model and is just to show
you how to set up the linkage.
.