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D5 - RADIO - What is Expo for, and how does it work ?

The EXPO setup is usually a part of the D/R (Dual Rate) setup.  Expo adjusts the actual amount of servo movement that occurs around the centre stick position.  By putting a positive value in expo for Elevator and Aileron, it takes more stick movement to achieve a given amount of movement of the swash in the relevant direction.  A negative value does the opposite, and makes the helicopter VERY TWITCHY around the centre point of the cyclic stick.

So to soften your  helicopters response to cyclic inputs, put a positive amount of Expo in to Elevator and Aileron. About 20% is usually quite enough for most pilots.

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