SUKHOI 31.
Instruction Manual
26
Accurately mark the balance point on the top
of the wing on both sides of the fuselage. The
balance point is located 100-115mm back from
the leading edge. This is the balance point at
which your model should balance for your first
flights. Later, you may wish to experiment by
shifting the balance up to 10mm forward or
back to change the flying characteristics. Mov-
ing the balance forward may improve the
smoothness and arrow- like tracking, but it may
then require more speed for take off and make
it more difficult to slow down for landing. Mov-
ing the balance aft makes the model more agile
with a lighter and snappier ”feel”. In any case,
please start at the location we recommend .
With the wing attached to the fuselage, all
parts of the model installed ( ready to fly), and
empty fuel tanks, hold the model at the
marked balance point with the stabilizer level.
CG
100-115mm
Lift the model. If the tail drops when you
lift, the model is “tail heavy” and you must add
weigh* to the nose. If the nose drops, it is “nose
heavy” and you must add weight* to the tail to
balance.
*If possible, first attempt to balance the model
by changing the position of the receiver bat-
tery and receiver. If you are unable to obtain
good balance by doing so, then it will be nec-
essary to add weight to the nose or tail to
achieve the proper balance point.
1. We highly recommend setting up a plane
using the control throws listed.
2. The control throws should be meas-
ured at the widest point of each control sur-
face.
3. Check to be sure the control surfaces
move in the correct directions.
CONTROL THROWS
.
1. Completely charge your transmitter and
receiver batteries before your first day of fly-
ing.
2. Check every bolt and every glue joint in
your plane to ensure that everything is tight
and well bonded.
3. Double check the balance of the
airplane.
4. Check the control surface.
5. Check the receiver antenna . It should
be fully extended and not coiled up inside the
fuselage.
6. Properly balance the propeller.
We wish you enjoy.
PRE-FLIGHT CHECK.
Ailerons : 10mm up 10mm down
Elevator : 15mm up 15mm down
Rudder : 30mm right 30mm left
Aileron Control
