Discussion
Statement I: Thrust-to-weight and wing loading on a constraint diagram are dimensionless in wing loading.
Statement II: Working in non-dimensional terms makes the diagram independent of aircraft size.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Statement I is incorrect but Statement II is correct
Statement I is incorrect. Thrust-to-weight is indeed dimensionless, being a ratio of two forces, but wing loading is not - it is a force per unit area, carried in newtons or kilonewtons per square metre, and the diagram's horizontal axis has those units.
Statement II is correct as a general principle: non-dimensional working does make a result independent of scale. It simply does not apply to this axis, which is why two aircraft of very different size have constraint diagrams spanning different ranges of wing loading, and why unit consistency matters so much in these calculations.
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