Good job of cut and paste, a fifteen years old could do that.
What's that from, "Aerodynamics for Naval Aviators 1962"?
You are yet to put any of your own material in it.
Neither you answered what Marine units are experienced on the 412 or why the fully articulated rotor system can do things a rigid one cannot.
Failing to do so shall make you a troll and no more of your posts shall be answered.