The VR360 camera mount has an optional Pan-Lock device. This allows the helicopter to be locked to the camera mount while the helicopter is on the ground. Once the helicopter lifts off the Pan-Lock disengages and allows the VR360 to spin in the pan axis.
For underslung 360 camera mounts this is an important feature because during rotor blade spoolup the torque can overdrive and burn out or strip the pan servo.
This video shows how to properly setup the Pan-Lock on a VR360.