A Turbofan engine is to be scale in order to have our desired engine characteristics. If length of the existing engine selected is 2.5 unit and required scale factor is 0.8 then, evaluate approximate length of our engine.(a) 2.28 unit(b) 5.6 unit(c) 10 unit(d) 15 unitI got this question in a national level competition.The origin of the question is Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design

A Turbofan engine is to be scale in order to have our desired engine c

1.	A Turbofan engine is to be scale in order to have our desired engine characteristics. If length of the existing engine selected is 2.5 unit and required scale factor is 0.8 then, evaluate approximate length of our engine.(a) 2.28 unit(b) 5.6 unit(c) 10 unit(d) 15 unitI got this question in a national level competition.The origin of the question is Propulsion topic in section Propulsion and Fuel System Integration of Aircraft Design
Answer» Correct option is (a) 2.28 unit Best explanation: GIVEN, ACTUAL length Lactual = 2.5unit, S.F. = 0.8 Approximate length is given by, Length L = Lactual(SF) ^0.4 Length L = 2.5(0.8) ^0.4 = 2.28 unit.

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