More technology, less fuel

Engine makers use several techniques to improve efficiency, cut emissions.

The BP oil spill and drilling moratorium play up continuing uncertainties about petroleum supplies, while the green movement is prompting every industry to examine ways to reduce emissions. Aircraft engine suppliers are racing to produce models that meet those demands.

Design teams are pushing forward with many technologies. The move to higher pressure ratios is continuing. New materials are being used to cut weight. And fuel-saving concepts are being used in engines large and small.