More than 20 years and $10 billion in the making, Pratt & Whitney’s PurePower Geared Turbofan jet engine uses a slower-spinning fan—but a faster-running turbine and compressor—to reduce fuel consumption by 16%, saving some $1 million per aircraft per year. It also lowers gaseous emissions and cuts an aircraft's noise output by 75%, which is great news for people living near airports.
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