11.   As the engine noise grew louder, Ashley set off across the grass.

12.   An eerie silence is broken only by the sound of a heartbeat and snippets of engine noise in the background.

13.   Bose Corp., the audio-products company that produces such headsets for the military, says its research shows pilots stay more alert when engine noise is silenced.

14.   Again, not four years ago, the only engine noise in this place was that of farm tractors and long-bed trucks hauling produce to market.

15.   But I heard absolutely no change in the engine noise.

16.   Engine noise is high, which hardly matters because that cacophony is drowned out by the chatter of the canvas top.

17.   Engine noise swamps cockpit conversation.

18.   Engineers lower engine noise by reducing the maximum speed at which the engines move air.

19.   Engine noise disturbs the whales.

20.   Engine noise is excessive, and the vague steering, harsh ride and uncomfortable driving position add to the strain.