We'll be running the main motor for maybe two days.

In order to check the fire, the main motors were stopped for one minute; then started again.

He had to turn off the main motor, now!

"Suppose the main motor stops while you're in the helicopter?"

The shift had been made automatically, when the main motor gave out.

It was tried, but something went wrong with the main motor, and only half power could be developed.

We lost one of the three main motors going up.

Never use the main motor unless you're pushing the tree.

Do not use the main motor at any time!

The main motor of instability there is not religion but repression.