What is the most fuel efficient Turbojet engine by pass ratio of A380?

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The A380 is equipped with four Rolls-Royce Turbojet engines, which have a bypass ratio of approximately 9. Fuel efficiency is a key design factor for these engines, but it must be balanced with manufacturing costs and reliability. Current engines typically require overhauls every five years or more, emphasizing the need for stable performance. Overall, while optimizing fuel economy is crucial, it is part of a broader design compromise. The discussion highlights the importance of these factors in aviation engine design.
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With four Rolls-Royce Turbojet engines attached on A380, I wonder, if the optimization of fuel efficiency as its prime design factor/variable? If so, may I know, what it is air by pass ratio?
 
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The A 380 engines have a bypass ratio of about 9.
While fuel economy is an important design factor, it is always a compromise with manufacturing cost and reliability equally important. Engines currently go for 5 years between overhauls or more. Maintaining stable performance throughout is a critical requirement.
 


Huh. . . I raise my thumb up! It comes to near perfect answer. Thank you very much.
 

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