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Wing fuel volume scales roughly with thickness ratio and chord squared. Reducing thickness from \( 12 \) to \( 10 \) per cent at constant chord changes the volume by

  • A.A fall of about 17 per cent
  • B.A fall of about 2 per cent
  • C.A rise of about 17 per cent
  • D.No change

Answer: A

The volume falls in proportion to thickness, so \( 10/12 = 0.833 \), a reduction of about seventeen per cent. On a design already tight for tank space this can be the constraint that stops the wing being thinned further.

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