1.   He had Reacher and the gunner lean out to watch the very delicate tail rotor.

2.   Hovering at the front of the clearing, the tail rotor was only a few feet from the rear.

3.   I was nervous about hitting the tail rotor on the rough ground.

4.   My tail rotor spun just a few feet from the ground.

5.   We have already seen that the weathercock effect due to forward flight makes the tail rotor too effective.

6.   You should see the tail rotor slow right down or even stop.

7.   City and federal officials said it was too early to say definitively what caused the tail rotor to break off and how much it contributed to the crash.

8.   Compared to a conventional tail rotor, there is less vibration, which means lower maintenance costs.

9.   Instead of a tail rotor, the unique NOTAR helicopters use a stream of air to counter the torque produced by the main rotor blades.

10.   Ten minutes after picking up the girl, the helicopter was flying south when, for unknown reasons, a tail rotor broke off.