Discussion
Consider the following statements about historical weight regressions:
1. They give a usable first estimate very quickly.
2. They should be chosen to match the aircraft class.
3. They extrapolate reliably to unconventional configurations.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: regressions give a fast first estimate and must be drawn from the right class of aircraft. Statement 3 is their central weakness. A regression describes the aircraft it was fitted to and nothing more, so it cannot be trusted for a blended wing body, a strut-braced wing or any configuration outside its sample. Novel designs need physics-based estimates much earlier for that reason.
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