Spektrum DX18 Manuel D'utilisation page 23

Throttle (Motor) Curve
(AIR, HELI, called Motor Curve in SAIL)
Curve functions support changing the relationship between
stick positions (Up to 7 points possible) and channel output. The
screens display up to a 7-point graph on the left to show the
result of the values chosen on the right. Moving the throttle stick
moves a vertical line across the curve graphic. Make Expo ACT
(active) to smooth the sharp-angled shape into a curve.
The throttle curve function supports adjustment of throttle re-
sponse in all available flight modes (except hold). When properly
adjusted, a helicopter main rotor head speed or rpm (revolutions
per minute) should remain consistent in all maneuvers and
throttle stick positions. For aircraft and sailplanes the curve can
be adjusted to provide a linear throttle response. Throttle curves
vary among powerplants, so adjust values in test flights to get a
consistent main rotor head speed in all flight modes or a linear
throttle response as desired.
Mixing
Mixing allows control input for a channel to affect more than one
channel at a time. Mixing functions support:
• Mixing a channel to another channel.
• Mixing a channel to itself.
• Assigning offset to a channel
• Linking primary to secondary trim.
These mixes are available for each model memory: 16 program-
mable mixes, Cyclic to Throttle (HELI) or Elevator to Flap (ACRO)
Aileron to Rudder (ACRO).
AIL>RUD
AIL>FLP
ELE>FLP
FLP>ELE (SAIL)
Select a channel for master and slave. Inputs for the mas-
ter channel control both the master and slave channels. For
example ELE > FLP makes elevator the master channel and flap
the slave channel.
SPEKTRUM DX18 • TRANSMITTER INSTRUCTION MANUAL
To add points on a curve, as you move the throttle stick, a line
moves across the graph and the closest point is highlighted. As
you move the stick a message may appear at the bottom of the
screen when you are on a point. Move the stick to a position
where you want to insert or remove a point. Press the roller to
add or remove a point. The default for inserting a point is to put
the point on the line where the cursor is (both X and Y coordi-
nates). On a curve with Expo ON, this may change the curve
slightly due to the way the curves are created mathematically. If
you see only 3 points on a curve, move the stick to a desired lo-
cation and add a point to the curve. Points cannot be placed very
close together on a curve. You may put two points so near each
other that another point cannot be put between them. If that oc-
curs, delete points close together to continue curve editing.
To edit a curve, ensure the assigned control switch is in the posi-
tion that activates the curve.
Offset
Offset is not available for curve mixes. Change the offset value
to move the effective center position of the slave channel. Posi-
tive or negative value determines the direction of the offset.
Trim
To adjust the trim for both channels, set Trim to Act. A channel
monitor on the left side of the screen shows how channels
respond to input. To view a switch-assigned mix on the monitor,
the mix switch must be in the active position.
You can activate mixes by an assigned switch. See Flight Mode
and Switch Select for assignment of flight modes to switches
and switch positions.
CAUTION:
Always do a Control Test of your model after
changing mixes.
EN
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