Discussion
Assertion (A): Rubber engine sizing is used for a clean-sheet design but rarely for a derivative.
Reason (R): A derivative is usually constrained to an engine that already exists.
Select the correct answer from the options below.
Answer: A
Both statements are true and the second is the reason for the first. Where the engine is fixed, the airframe must be sized around its thrust rather than the other way about, which changes the whole character of the sizing exercise.
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