Discussion
Consider the following statements about the sizing loop:
1. It iterates because weight and fuel depend on each other.
2. Convergence indicates a self-consistent design.
3. Divergence indicates an arithmetic error.
Which of the statements given above is or are correct?
Answer: C
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: the loop iterates because weight and fuel each depend on the other, and convergence means a self-consistent design has been found. Statement 3 is wrong and is a dangerous misreading. Divergence is usually a real physical result - the mission exceeds what the assumed technology can achieve - and treating it as an arithmetic error wastes time that should be spent renegotiating the requirement.
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