There was nothing left of the propulsion system that would work.

"Do you know what type of propulsion system it has?"

In these, electric power is a big part of the propulsion system.

We both examined it and found I had been right about the propulsion system.

The two different models would pull each other through its own propulsion system.

"Tell me what you remember about the power fluctuations in the propulsion system."

Such data were used to direct all the spacecraft's propulsion systems.

The propulsion system alone made the B-36 a very unusual aircraft.

For instance, there was the little matter of getting a propulsion system back on-line.

"But you're familiar with the details of the propulsion system, aren't you?"