Did you see the recent Popular Mechanics that featured a new generation of helicopter that is able to overcome the retreating blade stall phenomenon. Very interesting read.
Video that treats this much too glibly IMHO
“Did you see the recent Popular Mechanics that featured a new generation of helicopter that is able to overcome the retreating blade stall phenomenon. Very interesting read.”
http://www.popularmechanics.com/flight/a10616/the-rise-of-radical-new-rotorcraft-16850989/