Tandem Rotor Helo Yaw Control
There may be a simple answer to a question that has occupied my waking thoughts for the past few days (might be the combination of cheese and wine the previous evenings); without the obvious tail rotor yaw control, how does something like a Chinook do spot turns? That is, with torque presumably taken care of by contra-rotating fans on top (big assumption), how are aerodynamic forces applied to do the turning?
Layman's terms will be just fine; brain overloads too easily these days.
Ta