User manual

49SPEKTRUM DX20 • TRANSMITTER INSTRUCTION MANUAL
EN
The Swashplate menu option enables you to adjust the following:
• SwashplateMix
• Exponential
• E-Ring
• Elevator Compensation
UsepositiveornegativeSwashplatemixvaluesasneededfor
correct direction response of the helicopter.
BeforemakingadjustmentstotheSwashplatemix,makesurethe
throttle/collective pitch input moves the entire swashplate up or
down. If the servos are not moving in the same direction, reverse
them as necessary in the Servo Setup menu option.
When the entire swashplate moves up or down:
1.AdjustthemixvaluefortheAileronandElevatorchannels.If
the servos do not move in the correct direction, change the
directionofthemix—forexample,apositivevalueinsteadof
a negative value.
2.AdjustthemixvalueforthePitch.Iftheswashplatedoesnot
move in the correct direction, change the direction of the value
(negativeinsteadofpositive).
AlwaysenableExpowhenusingastandardrotating-armservo.
TheExpodeliverslinearmovementoftheswashplatefroma
standardrotaryservo.WhenExpoisinhibited,thearmona
rotary servo moves on a curved path with decreased swashplate
movementattheextremesoftheservoarmtravel.
NOTICE: DonotenableExpowhenusingalinearservo.
Electronic E-Ring
This feature prevents over driving servos by limiting servo travel if
thesumofyourcyclicandpitchinputsexceedsservolimits.
The Gyro menu option enables you to assign a gyro gain value
to an independent switch or a Flight Mode. Assign the receiver
channel connected to the gyro, then assign the switch for gyro
options. You can also assign values to available switch positions
(from1to4ratesareavailable,dependingontheswitch
assigned).Makesurethegyrooperatescorrectlyandcompensates
in the correct direction.
Cyclic to Throttle
CyclictoThrottlemixpreventsrpmlosswhenaileron,elevatoror
rudderinputsaregiven.Thismixadvancesthethrottleposition
with cyclic or rudder control to maintain rpm. At full throttle, Cyclic
toThrottlemixingpreventsthethrottlefromoverdrivingtheservo.
IMPORTANT: DonotuseCyclictoThrottlemixwhenusinga
governor.
ToverifythattheCyclictoThrottlemixisworkingproperlyandin
the correct direction, move the flight mode switch to one of the
active positions. Move the programmed cyclic or rudder channel,
noting the throttle position. The throttle position should increase.
Ifthethrottledecreases,thentheoppositevalue(positivevs.
negative)isneeded.
Swashplate
TheSwashplateMixtypicallycorrectsswashplatetimingissuesby
mixingAilerontoElevatorandElevatortoAileron.Whenadjusted
correctly, the Swashplate causes the helicopter to roll and pitch
accurately with minimal interaction.
TheTailCurvefunctionmixestailrotorinputwiththethrottle/
collective function to counter torque from the main rotor blades
whenusinganon-headinghold(taillock)gyroorwhenusing
ratemodeonagyro.SeePitchCurveformoreinformationon
programming curves.
HELI (HELICOPTER)
Swashplate
Gyro
Tail Curve
Mixing