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Assertion (A): A heavier design weight moves every line on the constraint diagram upward.

Reason (R): Wing area and installed thrust both scale with the design weight at a fixed design point.

Select the correct answer from the options below.

  • A.A is true but R is false
  • B.A is false but R is true
  • C.Both A and R are true, and R is the correct explanation of A
  • D.Both A and R are true, but R is not the correct explanation of A

Answer: B

The reason is correct but the assertion is not: the non-dimensional lines do not move at all, and only the dimensional outcome changes. Confusing a movement of the lines with a change in the dimensional outcome is a common error.

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