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Why we use fixed engine for aircraft sizing?

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in Aircraft Design by (701k points)
Why we use fixed engine for aircraft sizing?

(a) Cost effective

(b) Can be stretched

(c) Can be rubberized

(d) Can provide variable thrust at sizing

I have been asked this question in class test.

I would like to ask this question from Fixed-Engine Sizing in portion Initial Sizing of Aircraft Design

1 Answer

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Best answer
Correct option is (a) Cost effective

The best I can explain: Fixed engine is more easily available than a rubber engine. Any existing engine can save millions of dollars which was going to be spend in developing the new engine. However, we cannot stretch it during sizing but they are more cost-effective than the rubber engine.

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