Bombardier’s proposed CSeries airliner will benefit from engines with bypass ratios around 10:1, a figure unheard of for a narrow-body airliner and only recently heard of for widebodies. The company says each of the three engines it’s reviewing—from Rolls-Royce, Pratt & Whitney and CFM International—offers such a high bypass ratio. It hopes to choose one of them, or maybe two, by year-end as it works toward a launch decision on the 110- and 130-seat aircraft ...


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