Discussion
In a DAPCA-style parametric cost model, the principal driver of engineering hours is
Answer: C
Correct answer: Empty weight and speed
In the DAPCA family of models engineering hours are estimated from empty weight and maximum speed, both raised to fitted exponents. Weight stands for the sheer quantity of structure and system to be designed and analysed; speed stands for the technical difficulty, since a faster aircraft demands more aerodynamic, thermal and structural work per kilogram.
Range and passenger capacity influence cost only through their effect on weight, and wing area alone captures neither the whole airframe nor its difficulty. The same two variables drive the tooling and manufacturing relations.
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