T a i l m o v e s T a i l $_{ }$m o v e s Negative or Low Positive Pitch Medium Positive Pitch High Positive Pitch Figure 3-6.  Tail rotor pitch angle and thrust in relation to pedal positions during cruising flight.  are used for directional control of the aircraft while in flight,  as well as while taxiing with the forward gear off the ground.  In intermeshing rotor systems, which are a set of two rotors  turning in opposite directions with each rotor mast mounted  on the helicopter with a slight angle to the other so that  the blades intermesh without colliding, and a coaxial rotor  systems, which are a pair of rotors mounted one above the  other on the same shaft and turning in opposite directions, the  heading pedals control the heading of the helicopter while at  a hover by imbalancing torque between the rotors, allowing  for the torque to turn the helicopter. This chapter introduced the pilot to the major flight controls  and how they work in relation to each other. The chapter also  correlates the use of flight controls and aerodynamics and  how the two work together to make flight possible.  Chapter Summary 3-5