A type of helicopter with two sets of counter rotating main blades. Typically both sets of blades have set pitch angles.
Heli Setup
Collective Pitch Direction. Specifies the direction, Normal (—) or Inverse (INV).
Collective is the angle of the main rotor blades of a heli and is why a collecive pitch helicopter can fly upside down. Helicopters with fixed pitch blades (this includes almost all coaxial helicopters) do not require collective.
A helicopter that has main blades that can change angle while in flight. Usually achieved by adjusting the tilt and height of a swash plate.
Specifies the virtual channel to be used on MIXER page for pitch curve(s).