If you're looking for something "interesting" in a "so bad it's good" way, the film (Robotic Officer Tactical Operation Research) is a legendary piece of low-budget cinema. It follows a robotic police officer that goes on a killing spree after being prematurely activated.

Studies on intermeshing-rotor helicopters and coaxial systems explore how dual-rotor setups can eliminate the need for a tail rotor entirely, reducing complexity and increasing lift.

A true rotor is defined by its ability to respond to "edgewise flow" by flapping its blades, a key distinction from simple propellers used in many new eVTOL (Electric Vertical Take-off and Landing) aircraft.

Active rotor blades for helicopters | DEMOS Project - CORDIS