A turboprop engine is to be scaled from an existing engine. If scale factor is 0.85 then, what will be the value of diameter of our engine? Given actual diameter of selected existing engine is 8.56unit.(a) 8.4 unit(b) 23(c) 0.89(d) 9.123The question was asked during an internship interview.This intriguing question comes from Propulsion topic in chapter Propulsion and Fuel System Integration of Aircraft Design

A turboprop engine is to be scaled from an existing engine. If scale f

1.	A turboprop engine is to be scaled from an existing engine. If scale factor is 0.85 then, what will be the value of diameter of our engine? Given actual diameter of selected existing engine is 8.56unit.(a) 8.4 unit(b) 23(c) 0.89(d) 9.123The question was asked during an internship interview.This intriguing question comes from Propulsion topic in chapter Propulsion and Fuel System Integration of Aircraft Design
Answer» The correct answer is (a) 8.4 UNIT The explanation: GIVEN, scale factor SF = 0.85, actual DIAMETER D = 8.56 unit Now, scaled ENGINE diameter d = DSF^0.12 = 8.56 0.85^0.12 = 8.4 unit.

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