A few minutes later they heard the steady rhythm of helicopter blades approaching.
Behind us I heard the helicopter blades chug to a halt.
Shea ducked down and walked out from under the helicopter blade.
The roar of helicopter blades would drown out his voice.
The thumping of the helicopter blades above us was loud.
Then the sound of helicopter blades beating the air reached him.
About ten minutes later, I heard this vaguely familiar sound and recognized it as helicopter blades beating the air.
In the distance, I could hear helicopter blades beating the night air.
"None," he answered, half shouting to be heard above the pounding of helicopter blades.
I said to Anderson over loud blowing air and rotating helicopter blades.