Discussion
A Class I weight estimate is characterised by
Answer: A
Correct answer: Statistical fractions applied at aircraft level
A Class I estimate is made at the very start of a design, when nothing is defined in detail. It takes the take-off weight and applies fractions drawn from a database of similar aircraft - an empty weight fraction, a fuel fraction - to get a first consistent set of weights. It is quick and it closes the sizing loop; what it cannot do is tell you which group is heavy, because it never looks below aircraft level.
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