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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.
Main Motor
Proportional Mix
Trimmer Pot
• 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. (+)
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