VRS is also known as "Settling With Power." I am a student helicopter pilot and it is drilled into new pilots from day one. Essentially the rotors get caught in their own vortices due to vertical decent without horizontal movement. It causes the rotors to loose available lift due to the prop...
One thing to be aware of in rapid decent is a phenomenon known as "Vortex Ring State." https://en.m.wikipedia.org/wiki/Vortex_ring_state
Not as common with quad rotors but something to be mindful of since it is still a very real condition.
Not to hijack the thread...
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