Once you start using a DX6i transmitter you will find that while the built in elevon wing mix does work, it goes wrong when you use subtrims to center your servos. This is quite inconvenient because the way servos are made, you nearly always need subtrims to center things up before setting push rod lengths.
Instead of using the elevon wing setting, one can achieve the same thing using the dual aileron setting and one mixer.
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