Discussion
A sizing loop starting at \( 70 \) t returns \( 88 \), then \( 106 \), then \( 130 \) t. This loop is
Answer: A
Correct answer: Diverging; the mission may be unachievable
The sequence 70, 88, 106, 130 grows by an increasing amount at each pass: every extra tonne of assumed weight demands more than a tonne of additional fuel and structure, so the loop runs away. No number of further iterations will help. The remedy is to change an input - relax the range or payload, improve the assumed aerodynamic efficiency or specific fuel consumption, or accept a technology whose risk must then be recorded.
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