For Collective (Variable Pitch) we have a term and definition in Remote Control Helicopter.

Describes the control which adjusts the pitch of the rotor blades; causing the heli to ascend or descend without the need to change the rotor RPMs. This is usually the up and down movement of the left stick on the Tx. Having the ability to do this means you can use the momentum of the blades when spinning to do an autorotation if the engine dies and gives quicker response time as well.
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