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Aircraft makers banking on new LEAP engine

Engines for B737 MAX and A320neo made by CFM International promise 15-20 per cent fuel savings

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The LEAP engine's fuel efficiency comes from better performance as well as being lighter thanks to new 3D weaving techniques for composite materials used to make the fan blades and fan casings.

Paris

IF there's one key selling point that aerospace giants Airbus and Boeing have both been using in marketing their new aircraft, it is fuel efficiency.

But neither of the two major plane makers are directly responsible for much of the promised improvement in fuel usage.

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