S10
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That is incorrect. In general higher bypass ratio of turbofan engine increases fuel efficiency.No, WS15 will have lower bypass ratio and remember bro WS10 have slightly higher bypass ratio because it is based on Civilian high bypass ratio turbofan (CFM 56), so WS15 will be more economical (fuel consumption wise ) than WS10
"This analysis incorporated the principle equations governing the performance of a turbine engine and through a computer simulation, varied the bypass ratio to show how the specific fuel consumption decreases as bypass ratio increases"
Turbofan Engine Bypass Ratio as a Function of Thrust and Fuel Flow (wustl.edu)