Gain. The effort by a gyro to compensate for a change in movement along an
axis. High gain provides more effort, and low gain provides less effort.
Heading Hold mode. Used primarily with aerobatic/3D aircraft, this mode
maintains the last yaw, roll, and pitch attitudes of the airplane when it is
activated. If the airplane is flying inverted or in knife-edge and Heading Hold
is activated, it will maintain the inverted flight or knife-edge flight. Also used
during hovers and torque rolls.
Pitch axis. The nose of the plane moves up and down (using the elevator)
along this line.
Roll axis. One wing moves up while the other moves down (using the ailerons)
along this line.
Standard mode. Mode used when the system is compensating for unwanted
changes in yaw, roll, and pitch. It compensates with the proper correction; if
the nose of the plane begins to pitch up, the unit inputs down-elevator.
Yaw axis. The nose of the plane moves left and right (using the rudder) along
One of the things I have found that makes setting up stabilization systems easy is the
downloadable dashboard programs that provide onscreen setting adjustments. Several of the
systems in this guide also have downloadable interface programs that allow you to connect your
PC to the stabilization system, which greatly simplifies the programming process. Instead of
using manual input, you simply connect the dashboard to your system with either a mini USB or
For my Bavarian Demon Cortex, I control it with my three-position (GEAR channel) auxiliary
switch to select between two separate stabilization settings, the center position being the
off position. By connecting the Cortex to my laptop computer with a mini USB cable, the gain
percentages as well as other features take only seconds to adjust and save. Also, the physical
position setting for the stabilization system case can be altered. This allows you to select the
orientation of the case for level vertical as well as with the cable ports to the front, rear, left, or
right sides so that your servo leads can clear pushrods or any other obstacles.
The gains for the Cortex gyro are adjusted by changing the endpoints of the auxiliary channel.
Negative values place the Cortex in its Normal mode (indicated by the LED glowing yellow). A
positive endpoint value places the Cortex in the Hold mode for 3D aircraft to improve hover
maneuvers (indicated by a green LED). In both flight-stabilization modes, the larger the endpoint-
setting value is, the higher the
stabilization effects will be.
For the center-switch position,
a zero endpoint setting turns
the Cortex stabilization off
(indicated by a red LED). For
normal sport and scale models,
where 3D performance is not
required, you can set the two
modes with various negative
value gains so that both banks
are Normal flight modes,
providing you with two different
amounts of stability.
Above: the Cortex stabilization system comes
with this wire assembly
to make servo installation
easy. Right: This is the
Cortex dashbard showing
the various settings to
adjust the amount of stabilization for each control.
PC DashboarD ProGramminG