18
Use a Great Planes AccuThrow (or a ruler) to accurately
measure and set the control throw of each control surface
as indicated in the chart that follows. If your radio does not
have dual rates, we recommend setting the throws at the
low
rate setting.
NOTE
: The throws are measured at the
widest part
of the
elevators, rudder and ailerons.
These are the recommended control surface throws:
ELEVATOR
HIGH RATE
LOW RATE
1/4"
[6mm]
12°
Up
1/4"
[6mm]
12°
Down
1/8"
[3mm]
6°
1/4"
[6mm]
10°
Up
1/8"
[3mm]
6°
Down
RUDDER
7/16"
[11mm]
17°
Right
7/16"
[11mm]
17°
Left
Right
1/4"
[6mm]
10°
Left
AILERONS
7/16"
[11mm]
17°
Up
7/16"
[11mm]
17°
Down
5/16"
[8mm]
12°
Up
5/16"
[8mm]
12°
Down
IMPORTANT:
The Cirrus SR22 ARF has been
extensively
fl own and tested to arrive at the throws at which it fl ies
best. Flying your model at these throws will provide you
with the greatest chance for successful fi rst fl ights. If, after
you have become accustomed to the way the Cirrus SR22
fl ies, you would like to change the throws to suit your taste,
that is fi ne. However, too much control throw could make
the model diffi cult to control, so remember, “more is not
always better.”
Balance the Model (C.G.)
More than any other factor, the
C.G.
(balance point) can
have the
greatest
effect on how a model fl ies, and may
determine whether or not your fi rst fl ight will be successful.
If you value this model and wish to enjoy it for many fl ights,
DO NOT OVERLOOK THIS IMPORTANT PROCEDURE.
A model that is not properly balanced will be unstable and
possibly unfl yable.
At this stage the model should be in ready-to-fl y condition
with all of the systems in place including the brushless motor,
landing gear, the radio system and battery pack.
❏
1. Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately
mark the C.G. on the top of the wing on both sides of the
fuselage. The C.G. is located 2-3/16" [56mm] back from the
leading edge of the wing at the fuselage.
This is where your model should balance for the fi rst
fl ights. Later, you may wish to experiment by shifting the
C.G. up to 3/8" [9.5mm] forward or 5/16" [8mm] back to
change the fl ying characteristics. Moving the C.G. forward
may improve the smoothness and stability, but the model
may then require more speed for takeoff and make it more
diffi cult to slow for landing. Moving the C.G. aft makes
the model more maneuverable, but could also cause it to
become too diffi cult to control. In any case,
start at the
recommended balance point
and do not at any time
balance the model outside the specifi ed range.
❏
2. With the wing attached to the fuselage, all parts of the
model installed (ready to fl y) and battery installed, place the
model upside-down on a Great Planes CG Machine, or lift it
upside-down at the balance point you marked.
3. If the tail drops, the model is “tail heavy” and the battery
pack and/or receiver must be shifted forward or weight must
be added to the nose to balance. If the nose drops, the
model is “nose heavy” and the battery pack and/or receiver
must be shifted aft or weight must be added to the tail to
balance. If possible, relocate the battery pack and receiver
Summary of Contents for SR22 Turbo
Page 24: ......
