Throttle Trim Lever Function
Hovering Throttle Lever
Throttle Curve Exponential
H-24
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 power when the flight 
mode switch is in the Normal mode. The throttle trim lever 
has no effect on flight modes 1, 2, 3, 4, or in throttle hold.
Note: Making changes to the throttle trim lever does 
not change the input values for any of the points on 
the throttle curve; it merely makes adjustments to the 
engine idle speed position.
The Hovering Throttle lever increases or decreases the 
engine output power for the middle three points set for 
the throttle curve. As shown in the figure below, use of 
the hovering throttle lever shifts the curve upward or 
downward parallel with the original curve. Therefore, 
operation of the hovering throttle knob does not cause 
any change to the original settings of the throttle curve.
The throttle trim range will affect the throttle curve as 
shown. The adjustable range of output using the hovering 
throttle lever is approximately +/-15 points  as shown in 
the diagram below.
Note: The Hovering Throttle has no effect on flight 
mode switch positions 1 and 2.
With the X9303 2.4 system, individual throttle curves 
are selectable to be either straight (linear) or curved 
(exponential) setting. With the exponential function on, 
you will notice that any sharp angles of the throttle 
curve will become more “rounded” or “smooth”, 
creating more equal throttle servo movement during 
the entire curve range.
Accessing the Throttle Curve Exponential 
Function
1. From the Throttle Curve function, press the 
Channel key until “EXP” appears at the center of the 
LCD screen.
2. Highlight the EXP OFF with the Selector. Press the 
Selector to change the display from OFF to ON.
3. To exit the Throttle Curve function, move the Selector 
to highlight LIST and press.
[THRO CURV]◊N
Point-L
Point-1
Point-2
Point-3
Point-4
Point-5
Point-H
 0.0%
  INH
  INH
 50.0%
  INH
  INH
100.0%
NORM
EXP OFF
IN  5
OUT  5
L 1 2 3 4 5 H
+15
-15