Hi! I have uploaded a set of three new videos explaining 3 basic principles of the quadrotor. In this case I'm using my own board, theFLCv2.0 ( but the concept may apply for other quadrotors and autopilot systems too).

First of all: why do we need controllers on the quadrotor and the effect of the different modes of flying:

Then two different ways of reference tracking:

And the coolest part: perturbation effects and rejection

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