I know this will not be a good way of asking something but I cannot think a better way.
In this video : https://youtu.be/wg8ZbiC9IBw
He builds a fixed wing an makes it fly, my question is related to the things happening between minutes 3 and 4;
I think he must be using a flight controller so that, as it can be seen in the beginning of 3rd minute, the airplane flies nice, but then he says that
I put that 3-axis gyro so that it can fly more stable
I am confused at that point, doesn't a flightcontroller has its own gyroscope already? What is the need of the external one?