Discussion
An engineer applies a jet transport weight regression to a sailplane design. The result will be
Answer: C
Correct answer: Meaningless; the classes differ entirely
A regression carries no information beyond the aircraft it was fitted to. A jet transport is a pressurised, swept-wing, high wing-loading machine with an empty weight fraction near 0.5; a sailplane is unpressurised, unpowered, of enormous aspect ratio and very low wing loading. Nothing in the fitted relationship applies, and the answer will be wrong by a large and unknown factor rather than conservatively so. Unconventional or out-of-class designs must be estimated from physics much earlier.
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