Installing The Switch; Balance; Lateral Balance; Control Throws - Model Tech SUKHOI 40 Instructions Manual

3) Using a 1/16" drill bit, drill a hole through
the side of the fuselage, opposite the muffler, for
the antenna to exit. Route the antenna out of the
fuselage and secure it to the vertical stabilizer us-
ing a rubber band. See figure # 17 below.
Figure # 17
MODIFIED
SERVO ARM
ANTENNA

INSTALLING THE SWITCH

4) Mount the switch to the fuselage side, op-
posite the muffler, at the middle of the servo com-
partment. Use the faceplate of the switch itself to
locate at make the necessary cutouts and holes.
1) It is critical that your airplane be bal-
anced correctly. Improper balance will cause
your plane to lose control and crash. The cen-
ter of gravity is located 3-3/8" back from
the leading edge of the wing, at the fuse-
lage sides. This location is recommended for
initial test flying and trimming. There is a 1/4"
margin forward and aft, but it is not recom-
mended that the center of gravity be located any
further back than 3-5/8". Balance the Sukhoi
upside down with the fuel tank empty.
2) Mount the wing to the fuselage. Using
a couple of pieces of masking tape, place them
on the top side of the wing 3-3/8" back from
the leading edge, at the fuselage sides.
3) Turn the airplane upside down. Place
your fingers on the masking tape and carefully lift
the plane.
4) If the nose of the plane falls, the plane is
nose heavy. To correct this first move the battery
pack further back in the fuselage. If this is not
possible or does not correct it, stick small amounts
of weight on the fuselage under the horizontal sta-
bilizer. If the tail of the plane falls, the plane is tail
heavy. To correct this, move the battery and re-
ceiver forward or if this is not possible, stick
weight onto the firewall. When balanced cor-
rectly, the airplane should sit level or slightly nose
down when you lift it up with your fingers.
CUT
TO VERTICAL
STAB
RUBBER BAND
27
Once you have flown and trimmed the Sukhoi,
the balance point can be moved forward or
aft 1/4" to change the flight performance. Moving
the balance point back will cause the Sukhoi to be
more responsive, but less stable. Moving the bal-
ance point forward will cause the Sukhoi to be
more stable, but less responsive. Do not fly the
Sukhoi beyond the recommended balance
range or an uncontrollable crash could result!

LATERAL BALANCE

After you have balanced the Sukhoi on the
C.G. you must laterally balance it. Doing
this will help the airplane track better.
5) Turn the airplane upside down. Attach
one loop of heavy string to the engine crankshaft
and one to the tail wheel wire. With the wings
level carefully lift the airplane by the string. This
may require two people to make it easier.
6) If one side of the wing falls, that side is
heavier than the opposite. Add small amounts of
lead weight to the bottom side of the heavier wing
half. Follow this procedure until the wing stays
level when you lift the airplane.
1) We highly recommend setting up the
Sukhoi using the control throws listed below. We
have listed control throws for both initial test fly-
ing/sport flying and aerobatic flying.
2) Turn on the radio system and with the trim
tabs on the transmitter in neutral, center the con-
trol surfaces by making adjustments to the clevises.
The servo arms should be centered also.
3) When the elevator, rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface. The control throws should be mea-
sured at the widest point of each surface!
INITIAL FLYING/SPORT FLYING
Ailerons: 1/4" up
Elevator: 5/16" up
Rudder: 3/4" right
AEROBATIC FLYING
Ailerons: 3/8" up
Elevator: 5/8" up
Rudder: 1-1/4" right
Do not use the aerobatic settings for ini-
tial test flying or sport flying.
1/4" down
5/16" down
3/4" left
3/8" down
5/8" down
1-1/4" left