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Geared Turbofan (known as GTF) is a high-bypass geared turbofan engine currently selected as the exclusive engine for both the Mitsubishi MRJ and Bombardier CSeries regional jets. Targeting more than 12% improvement in fuel burn with significant reductions in engine noise, environmental emissions and operating costs, Pratt & Whitney’s Geared Turbofan demonstrator engine has completed Phase II ground tests and has been cleared for flight testing. Unlike the traditional engines, the GTF uses a gearbox, not a low pressure turbine, to power a fan.

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This allows the fan, low pressure compressor, and turbine to operate at different speeds. By incorporating an extra layer of complexity into engine design, the gearbox allows far more efficient regulation of fan speed, resulting in decreased fuel use and noise.
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The Geared Turbofan has a fan tip diameter of 56-78-inches, a bypass ratio of 8-12, and provides a takeoff thrust of 15,000-30,000 pounds. Pratt & Whitney estimate that the increased efficiency will translate to savings of $1.5 million per aircraft, per year.