What are some of the trade-offs when it comes to aircraft design?

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Aircraft design involves significant trade-offs, such as the balance between fuel efficiency and engine size, where a smaller bypass ratio enhances efficiency but limits engine capacity. Key considerations include weight versus strength, power, and lift, where reducing weight can compromise structural integrity or performance. Additionally, cost is a critical factor that influences all design decisions, often requiring compromises between quality and affordability. The interplay of these design drivers highlights the complexity of creating efficient and effective aircraft. Ultimately, every aspect of aircraft design involves careful consideration of these trade-offs to achieve optimal performance.
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What are some of the "trade-offs" when it comes to aircraft design?

I mean things like smaller by-pass ratio means more fuel efficient but then that also means a smaller engine.

What are some of the other trade-offs when designing aircrafts new and old? How do the different design drivers affect each other?
 
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Pretty much anything on an airplane is a tradeoff, but the biggest ones will probably be weight vs. [something]. Weight vs. strength, weight vs. power, weight vs. lift, etc. etc.
 


There's also the ever-present "cost vs everything else".
 

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