This is the most common configuration;
While in Normal mode (position 1) you can cut the motor by pushing your throttle stick down to the very end.
While in Stunt mode (position 2 or 3) the motor will not cut when the throttle stick is in the lowest position, but continue at high speed.
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This has to do with the second function of your throttle stick (usually the left stick on the radio); collective pitch. Pitch is a term that describes the angle of your blades: Positive pitch generates lift, neutral pitch generates no lift nor does it generate down force, negative pitch generates down force.
Usually the stunt mode is set up like this:
High stick = full throttle and full positive pitch
Mid stick = almost full throttle and neutral pitch
Low stick = full throttle and full negative pitch
Why would you want full throttle and negative pitch? Well, you could use it to descend super fast! But, most people use it for inverted flying
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While flying like this, I have the stunt mode enabled and my throttle/pitch stick (left stick) is down low.