Acro / Gyro only

Requires: Gyroscope.

Also known as RATE mode. This is the mode that is enabled by default, when ANGLE and HORIZON mode are both disabled. In this mode, the position of the control sticks on the TX control the rate of rotation around the relevant axis of the airframe. For example, setting the roll stick to 5% right will cause the aircraft to increase it's roll at a constant rate analogous to 5%, until the pilot corrects back in the other direction. In this mode, there is no auto-level of any kind, and "centering the sticks" will simply cause the aircraft to maintain it's current attitude.

This mode is sometimes referred to as "Acro" mode, because it's useful for performing "acrobatics" (tight turns, flips, etc). It is also sometimes referred to as "Gyro only mode", because the Gyro will still attempt to hold the aircraft's heading stable against external yaw-inducing forces.

Preview of acro mode by Warthox [1]