Robert Lefebvre was a featured speaker at DroneCon 20Introduction To Rotorcraft Aerodynamics14, held on June 20th at the University of Colorado (Boulder). Sponsored by 3D Robotics, the talk was titled Introduction to Rotorcraft Dynamics.
In it, Robert explains some of the physical laws dictating the performance of multirotors and helicopters. The talk was recorded and had been hosted on YouTube.
The material presented is located here: