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Tail Rotor Proportional Mix Trimmer Pot Description and Adjustment
After establishing a stable hover, you will first want to adjust the tail rotor proportional mixing. The “proportional”
trimmer pot adjusts the amount of tail motor to main motor mixing.
• In hover, with the rudder trim centered and no rudder input, note which direction the nose of the helicopter is
trying to spin. If the nose of the helicopter is spinning to the left, you will want to increase the amount of tail
motor to main motor mixing. By turning the proportional trimmer pot clockwise (+), you increase the tail motor/
rotor rpm for a given main motor/rotor rpm. This increase in tail motor/rotor rpm will help to push the nose of
the helicopter to the right when in hover.
If the nose of the helicopter is trying to spin to the right in hover, decrease the tail rotor proportional mix by
turning the proportional trimmer pot counterclockwise (-).
Note: You must always power down the 3-in-1 control unit before making adjustments to the
proportional mix trimmer pot. Any changes made to the trimmer pot will not take effect until the 3-in-
1 unit is initialized and re-armed.
• As the battery output voltage decreases throughout the flight, it may be necessary to make small trim
adjustments to the rudder in order to keep the nose of the helicopter straight. Usually a few clicks of right
rudder may be required, and no further adjustment of the proportional trimmer pot will be necessary.
Note: More experienced pilots may choose to adjust the proportional mix to better hold the tail during
aggressive climb outs and aerobatics rather than in hover only.
• The amount of tail rotor proportional mix required may vary depending on the performance of a given flight
battery. For example, when switching from lower capacity and/or discharge rate capable packs to higher
capacity and/or discharge capable packs, some small adjustments to the proportional mix may be required. To
help prevent the need for additional adjustment of the proportional mix when switching between battery packs,
we suggest using the same make, model and performance packs only.
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