Except for the high whine of propulsion engines and the roar of wind created by the action, there was nothing much to hear.

Almost simultaneously the propulsion engines of the Drusus began to set up a howl.

Main, or propulsion engines are used to turn the ship's propeller and move the ship through the water.

Other requirements apply to the exhaust and noise emissions from propulsion engines.

There was no roaring or thundering of propulsion engines to be heard.

I was already checking the propulsion engines when the major's report finally came in.

Rhodan suddenly fired up the propulsion engines which encircled the ship.

Moments later, the propulsion engines of the Titan began to roar.

For 8 minutes now the ship's propulsion engines had been under full-power deceleration.

In the enormous heat of the propulsion engines and under the prevailing air pressure they also began to react.