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Transverse Flow Effect (can you feel it?)

Simply put is the changing of airflow from a vertical flow to a horizontal flow as you begin forward flight. As you start to accelerate your helicopter, at airspeeds from 10-20kts or 12-15kts (totally depends on what your instructor believes. However the bottom line is you will feel the vibration and right roll, so when you do, just look at your airspeed. If it's reliable.) airflow, upflap/downflap, and Angle of Attack, lift in the front half will be greater than the aft half of the rotor system. Due to gyroscopic procession this will manifest 90 degrees in the plane of rotation. In a counter clockwise rotor system this will cause the helicopter to roll slightly to the right. As stated earlier this aerodynamic phenomenon will manifest a vibration you can feel (NOT ETL). Pretty COOL stuff!