Tried this in a line and base check on a gazelle about 2 months ago. Problem with Gazelle throttle is in the roof. We had about 65 to 70 % torque. Had to fly at minimum speed to iniate a descent - took about 15 miles to lose 1500ft !!!As we came close to ground pull back a la quick stop and she settled on the ground. A bit tricky if you had more power on though !!!!!!!!