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Rubber engine sizing in conceptual design means

  • A.Using an existing engine unchanged
  • B.Ignoring propulsion entirely
  • C.Designing the engine in detail
  • D.Scaling a notional engine to suit

Answer: D

Treating thrust as a continuous variable lets the airframe be sized without being constrained by what happens to exist. Fixed-engine sizing, in which an available engine is selected, is the alternative and is more common for derivatives.

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