81 years ago, Igor Sikorsky demonstrated his helicopter invention to the public. : interestingasfuck
https://www.reddit.com/r/interestingasfuck/comments/xra7v4/81_years_ago_igor_sikorsky_demonstrated_his/An animation of how the movement mechanism of the helicopter blades works and showing its constituent details : EngineeringPorn
https://www.reddit.com/r/EngineeringPorn/comments/uopjkv/an_animation_of_how_the_movement_mechanism_of_the/Helicopter flight controls - Wikipedia
https://en.wikipedia.org/wiki/Helicopter_flight_controlsSimulation of rotor blade CFD/CSD coupling : EngineeringPorn
https://www.reddit.com/r/EngineeringPorn/comments/vdi290/simulation_of_rotor_blade_cfdcsd_coupling/