Collective Pitch Direction. Specifies the direction, Normal (—) or Inverse (INV).
Glossary
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).