The main engine was operating, but somehow it didn't feel quite right.

During this time the plane's engines were operating normally, he said.

When an engine is operating, the main valves are fully open.

The engine operated until about 1848 but proved to be too heavy for the line and was never entirely successful.

The engine can operate on two cylinders up to a speed of about 60 miles an hour.

It is nearly identical to the last steam engines operated on the line.

The engines operated normally for the entire flight until they were shut down.

The girls were very much interested in the craft and asked all sorts of questions about how the engine operated.

Because there is now 50% less hot combustion, the engine will operate cooler.

Analyzing used motor oil reveals a great deal about how the engine is operating.