Discussion
Match each sizing loop behaviour in List I with its interpretation in List II.
List I
A. Successive estimates converge
B. Successive estimates diverge
C. Fuel fraction required exceeds that available
D. Empty weight fraction falls
List II
1. The mission exceeds the assumed technology
2. The design closes and is self-consistent
3. Take-off weight falls, compounding the saving
4. The range requirement cannot be met as posed
Select the correct match.
Answer: A
The loop is diagnostic as well as computational: how it behaves says something about whether the requirements are achievable at all. A design that will not close is telling the programme something it needs to hear early.
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