JR Vibe 90SG - Page 70

70
PITCH-TO-ELEVATOR MIXING ADJUSTMENT WITH TRAVEL ADJUST
The total travel of each servo can vary slightly, which can also cause
the swashplate to be tilted fore and aft when the collective is moved
to the extreme high and low pitch positions. This situation can also
becorrectedifnecessarythroughtheuseofthetraveladjustment
function.
To check pitch-to-elevator mixing, it will rst be necessary to position
the collective stick in the center position as in the previous step.
Next, move the collective stick from the center to the high pitch
position while viewing the swashplate from the left side of the
model. While moving the swashplate, look for any tendencies for the
swashplate to tilt fore or aft as it reaches the high pitch positions.
Repeat this procedure several times to be sure that your observations
are correct. If no fore or aft tilting tendencies are found, it will now be
necessary to repeat this procedure from the center collective stick position to full low pitch. If no tilting tendency is
found, proceed to the next step.
In our example, we have shown that the swashplate has tilted backward as the collective has been increased to full
highpitch.Thiswouldindicatethatthetopservo’smaximumtravelislessthanthatofthetwoleft/rightservos.
In this condition, we suggest that the travel value for the rear servo be increased slightly (5–10%). Repeat the
above procedure and decrease the value as needed until the tilting tendency is eliminated. For information on the
traveladjustmentfunction,pleaserefertoyourradio’sinstructionmanualfordetails.Oncethisconditionhasbeen
corrected,repeatthisprocedureforthecenter-to-lowcollectivepitchpositionandadjustasneeded.
Note: It is very important that during this step, only the travel value for the top servo (elevator)
be adjusted to correct any pitch-to-elevator tendencies. If the travel value of the left or right servo
changes, this will aect the pitch-to-aileron tendencies corrected in the previous step. If you feel that
readjustment of the left and right servo travel is necessary, then it is suggested that the travel for each
servo be increased or decreased at the same amount and the pitch-to-aileron procedure be retested.