| In initial tests, some of the biomolecular motors spun their propellers for more than two hours, at eight revolutions per second. |
| Flashing propellers carved the skies as a variety of innovative aircraft and daring pilots, many of them female, quested for fame and money. |
| Such was the constant buzzing around our ears that at first we were deaf to the sound of inbound propellers. |
| The vessel's net entangled and fouled the 52-foot motor lifeboat's twin 36-inch brass propellers. |
| There was no chance of saving the ship and by low water she was hard aground, her propellers embedded in the sand. |
| With its wings folded and contra-rotating propellers missing, the former fighter was neatly parked between two of the unit's wooden huts. |
