The idea is to keep the engine operating in its ideal speed range, benefiting performance and, in particular, fuel economy.

As the Farman Goliath was incapable of maintaining level flight with only one engine operating, the pilot decided to make an emergency landing.

However, during a constant rate climb at a reasonably steady angle the lift force is generally less than the weight with the engine operating.

No explanation was found why the aircraft with one engine operating at maximum power suddenly entered a steep dive.

The vehicle drove 589 km/liter, fuel equivalent to gasoline with a 50 ccm 2-stroke engine operating by the Diesel principle.

Planes like the Boeing 767 can readily maintain safe flight with only one engine operating.

The goal of a transmission is essentially to keep the engine operating in its powerband.

Although the William Mason has returned to being displayed in the roundhouse, the museum has the engine operating on select weekends.

Idling means a period of time greater than 15 minutes when the motor vehicle is stationary with the engine operating.

In this manner, enough ice could accumulate to cause engine failure, even with the engine operating at full rated power.

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.