Lemon RX Stabilizer PLUS Receiver – Essential Instructions v.1.5
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4. Set the stabilizer mode to Autolevel (Indicator 2: Red and Green alternately flashing slowly). Rotate the
model about the pitch and roll axes and watch for the ailerons and elevator to deflect and stay deflected
when it is not level.
The directions of the stabilizer action on the aileron and elevator axes MUST be as follows:
• If the model is rolled to the right: right aileron goes DOWN and the left UP to level the model.
• If the nose of model is pitched down: elevator goes UP to restore the model to level flight.
The rudder is also stabilized but reacts differently:
• If model is yawed (rotated) to the right, the rudder pulses LEFT momentarily to resist the
displacement, then returns to neutral (as in Gyro mode – see Step 5).
If any response is incorrect, use the appropriate switch J1, J2 or J3 to reverse the action and test again.
Note that the labels ON and OFF have no specific meaning for these switches.
5. Set the stabilizer to Gyro mode (Indicator 2: Green ON, Red OFF) and test the stabilizer action on each
of the control axes. Directions of movement should be as above, except that this time what you are
looking for on all three axes is a pulse of movement of the control surface which occurs while the
model is starting to move from stationary.
For example, in Gyro mode, when you roll the model sharply to the right, the right aileron should for a
moment go DOWN and the left UP (to oppose the displacement), then they should return to neutral. (If
the direction of stabilization movement for aileron and elevator is correct for Autolevel mode it will also
be correct for Gyro mode.)
If the stabilizer motion in Gyro mode is hard to interpret, turn the three gain pots fully clockwise to
increase gain (or turn up Master Gain, if available). Note that it is often easier to feel the direction of
deflection with your finger on the control surface hinge than to see it. Additional information on
stabilizer response is provided in the Reference Guide.
6. Carefully recheck the directions of BOTH control movement AND stabilizer action – a mistake here can
have serious consequences! In summary: correct response to stick input is set in the transmitter,
correct response to a disturbance is set in the stabilizer.
7. Check that the three gain pots on the stabilizer are set close to 12 o’clock as a starting point.
8. If available, set Master Gain to the midpoint (i.e., 0% on the transmitter’s monitor screen). If your
transmitter has less than eight channels, Master Gain is fixed at 1, which is 0%, and you can skip this.
9. Check that the flight control trims are set to zero. If necessary, use a little Sub-trim to align the servo
arms at right angles to the pushrods. Adjust mechanical settings to center the control surfaces.
10. Test failsafe by turning off the transmitter with the motor running (make sure your prop is removed or
the model is restrained). The motor should stop within two or three seconds if No-pulse Failsafe is used
or almost immediately if Preset Failsafe is correctly set. Turn the transmitter back ON and the motor
should restart. (Do this failsafe test on the ground, NOT in flight!).
11. Make sure you know how to find the Stabilizer Mode switch without having to look down at the
transmitter and that you know how to turn it OFF quickly if there is a problem with the settings.
12. It is recommended that you set up Dual Rates on the transmitter with Low Rate being about 70% and
High Rate 100%.
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