"I needed a propulsion unit for one of my barges," he said.

"Titan reports she has another primary propulsion unit back on line. "

Six of our available 15 propulsion units went out.

But surely we already know something about the type of propulsion unit the craft might have.

They got in, and the propulsion unit started up, smooth enough.

We've got to test the suit's propulsion unit sooner or later.

So the propulsion units weren't back here, but somehow arranged elsewhere.

Granted, considerable space would be taken up by its life support, guidance and propulsion units.

The second cone rose and cut in its propulsion unit.

He checked to make certain the propulsion units worked in balance.