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Wing fuel volume matters to planform selection because

  • A.Fuel must be carried in the fuselage
  • B.Volume has no bearing on planform
  • C.A thin tapered wing may not hold the fuel
  • D.Fuel adds to the wing's lift

Answer: C

Volume scales roughly with thickness ratio and with chord squared, so thinning or tapering a wing sharply can leave the design short of tank space. Discovering this late forces either a centre tank or a compromise on the aerofoil.

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