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A requirement states a range of \( 6000 \) km with \( 20 \) t of payload. A design achieving \( 5400 \) km falls short by

  • A.6 per cent
  • B.12 per cent
  • C.20 per cent
  • D.10 per cent

Answer: D

Correct answer: 10 per cent

The shortfall is taken on the requirement:

\[ \frac{6000 - 5400}{6000} = 0.10 = 10\% \]

Ten per cent of range is not a detail: it may put a city pair out of reach and remove a large part of the market case. The response is either to find the range - through weight, drag or fuel capacity - or to renegotiate the requirement with the customer before the design is frozen.

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