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.
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Recent research highlights the Active Gurney Flap (AGF) system, which allows helicopters to maintain flight capabilities while reducing tip speeds, thereby lowering noise and vibration. A true rotor is defined by its ability