GREAT PLANES Siren ARF Manuale di istruzioni - Pagina 14
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3. Make certain that the control surfaces and the throttle
respond in the correct direction as shown in the diagram. If
any of the controls respond in the wrong direction, use the
servo reversing in the transmitter to reverse the servos
connected to those controls. Be certain the control surfaces
have remained centered. Adjust if necessary.
Set the Control Throws
Use a Great Planes AccuThrow
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
middle of both rate settings.
Note: The throws are measured at the widest part of the
elevators, rudder and ailerons.
These are the recommended control surface throws:
High Rate
ELEVATOR:
1/2" [12mm] up
1/2" [12mm] down
AILERONS:
3/8" [9mm] up
3/8" [9mm] down
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(or a ruler) to accurately
Low Rate
5/16" [8mm] up
5/16" [8mm] down
3/16" [5mm] up
3/16" [5mm] down
IMPORTANT: The Siren ARF has been extensively
flown and tested to arrive at the throws at which it flies
best. Flying your model at these throws will provide you
with the greatest chance for successful first flights. If, after
you have become accustomed to the way the Siren ARF
flies, you would like to change the throws to suit your
taste, that is fine. However, too much control throw could
make the model difficult 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 flies, and may
determine whether or not your first flight will be
successful. If you value this model and wish to enjoy it for
many flights, DO NOT OVERLOOK THIS IMPORTANT
PROCEDURE. A model that is not properly balanced will
be unstable and possibly unflyable.
At this stage the model should be in ready-to-fly condition
with all of the systems in place including the motor, battery,
finishing, and the radio system.
1. Use a felt-tip pen or 1/8" [3mm]-wide tape to accurately
mark the C.G. on the bottom of the wing on both sides of the
fuselage. The C.G. is located 2-1/8" [55mm] back from the
leading edge of the wing.
This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 3/8" [9mm] forward or 3/8" [10mm] back to
change the flying characteristics. Moving the C.G. forward
may improve the smoothness and stability, but the model
may be more difficult to slow for landing. Moving the C.G.
aft makes the model more maneuverable, but could also
cause it to become too difficult to control. In any case,
start at the recommended balance point and do not at
any time balance the model outside the specified range.
2. With the wing attached to the fuselage and all parts of the
model installed (ready to fly), place the model on a Great Planes
CG Machine
, or lift it at the balance point you marked.
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