1) Set a KA-60 on the runway, player controlled. Preview.
2) Get out of the helo, empty a clip into the ATRQ rotor to disable it. It has to be completely red.
3) Get back in, start up engine.
4) Apply full upwards collective, as expected you will yaw clockwise. Keep the collective at full.
5) Ascend to a safe altitude, lets say 100 meters.
6) Start oscillating left/right roll inputs. At some point the nose will point down and you will have negative speed.
7) At that point apply medium right roll input, and adjust to keep the attitude and roll rates.
8) It will fluctuate but you will notice negative speed while pointing down -> VSI indicates climb