Spektrum DX7 Instruction Manual page 47

Throttle Curve
The DX7 offers three (3) separate throttle curves with five (5) adjustable points per curve. This function allows
you to adust the throttle curve to optimize engine rpm at a particular pitch setting. Once the throttle curves are
established, each can be activated in flight using the 3-position flight mode switch. The flight mode switch offers
three (3) selectable curves: N=Normal, 1=Stunt 1, 2=Stunt 2.
The N, or Normal, position should be used for starting the engine and hovering. Positions 1 and 2, or Stunt 1
and Stunt 2, should be used for aerobatic maneuvers and forward flight.
Note: The throttle trim and hovering throttle lever are only operable when the flight mode switch
is in the Normal position. Thus, in the 1 or 2 positions, these two functions have no effect.
Each of the five (5) positions of the throttle curve are independently adjustable from 0–100%. These five (5)
positions correspond to the position of the throttle stick.
The transmitter is factory preset to the throttle curve as indicated by the solid line in the figure below. Individual
points can be activated and increased/decreased to suit your specific needs.
Press to enter
THROTTLE CURVE
[THRO CURVE]
NORM
≥Point-L
51
IN
Press to enter
Function Mode
To Access the Throttle Curve Function
Press the DowN and SELECT keys simultaneously to access the System Mode.
In System Mode, use the UP or DowN key to select the
Press the SELECT button to access pitch points L (Low), 1, 2, 3, or
Press the INCREASE or DECREASE key to change the selected pitch value or expo on/off.
92
Press to change values
0.0%
51
OUT
L 1 2 3 H
Press to select Press to return
desired points value to default
THRO CURVE NORM screen.
H (High) or EXPO.
SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE
Throttle Curve (continued)
Throttle Trim Setting
The throttle trim lever is only active when the flight mode switch is in the normal position. The throttle trim is
used to increase or decrease the engine rpm to achieve a reliable idle when in the Normal Mode. The throttle
trim lever has no effect in flight modes 1 or 2 (Stunt 1 or Stunt 2), or throttle hold.
Hovering Throttle Rocker Setting
The hovering throttle rocker increases or decreases the engine throttle position for the center point only (point
#2) of the throttle curve. Use of the hovering throttle rocker shifts the middle curve upward or downward.
Therefore, operation of the hovering throttle rocker does not cause any change to the high point and low point of
the throttle curve but only affects the hovering rpm. The hovering throttle rocker only affects the throttle curve in
normal mode and has no effect on the curve in Stunt 1 or Stunt 2.
Exponential Throttle Curve Function
With the DX7 system, individual throttle curves are selectable to be either straight (linear) or curved
(exponential). To select an exponential curve, press the select key until EXP OFF appears on the throttle curve
screen. Next press either the increase or decrease key to activate the exponential feature (an "on" will replace
the "off" on the screen). With the exponential function ON, you will notice that any "sharp" angles of the throttle
curve will become more "rounded" or "smooth," creating a smooth throttle servo movement during the entire
throttle curve range.
Idle Up
Normally, flight modes 1 and 2 are used to increase engine rpm below half stick for forward flight and
aerobatic maneuvers (idle up). At this time any other trims are not active as the throttle will only
operate/follow the current throttle curve values.
Stunt 1 and Stunt 2
Note: Throttle curves are adjusted independent of the normal throttle curve. Simply select the
desired throttle curve by using the up or down key.
SPEKTRUM DX7 • HELICOPTER PROGRAMMING GUIDE 93