Discussion
With an overall ratio of \( 0.809 \) and a six per cent allowance for reserves and trapped fuel, the fuel fraction is nearest to
Answer: D
Correct answer: 0.202
The fuel actually burned is \( 1 - 0.809 = 0.191 \) of the take-off weight. Reserves, diversion allowance and unpumpable fuel are not part of the mission, so the figure must be increased: \[ 1.06 \times 0.191 = 0.202. \] Taking 0.191 as the answer is the trap, and in a real design it would size the tanks too small to be certified.
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