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Main Motor Proportional Mix Trimmer Pot Description and Adjustment
The Main Motor Proportional Mix Trimmer Pot can be found on the left side of the 4-in-1 control unit. This
“proportional” trimmer pot adjusts the amount of mixing between the main motors allowing you to “fine-tune” the
rudder trim (sub-trim) to help prevent the nose from drifting to the left or right when in hover.
In a stable hover, with the rudder trim centered and no rudder control input, note toward which direction the nose
of the helicopter is trying to drift. If the nose of the helicopter is drifting to the left, you will want to increase power
to the right-hand motor (spinning the upper main rotor blade). This is accomplished by turning the “proportional”
trimmer pot clockwise.
If the nose of the helicopter is drifting to the right in hover, you will want to increase the power to the left-hand
motor (spinning the lower main rotor blade). This is accomplished by turning the “proportional” trimmer pot
counterclockwise.
Note: You must always power down the 4-in-1 unit before making adjustments to the proportional
mix trimmer pot. Any changes made to the trimmer pot will not take effect until the 4-in-1 unit is re-
initialized and re-armed.
Note: Be sure to use the proper size and type of screwdriver to carefully make adjustments to the trimmer pot.
Use of the improper size and type of screwdriver or too much force can damage the trimmer pot. Also be sure
to take your time when making adjustments to the proportional trimmer pot as it may only require very slight
adjustment to achieve the desired level of performance.
As the battery output voltage decreases throughout the flight, it may be necessary to make small adjustments
to the rudder trim or rudder control input in order to keep the nose of the helicopter straight. These small
adjustments can be made using the rudder trim lever or rudder control stick and do not require additional
adjustments of the proportional trimmer pot.
Main Motor
Proportional Mix
Trimmer Pot
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