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It is generally understood that the fuel tanks of aircraft are in the wings, but specifically, is the entire length of the the wing of:

  1. an Airbus A380 Jumbo used as fuel tank?
  2. a Boeing 747-800 Jumbo used as fuel tank?

What percentage of the wing length is used as a fuel tank and for what reasons, for:

  1. an Airbus A380 Jumbo
  2. a Boeing 747-800 Jumbo
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Fuel tanks take most of the space in aircraft wings, but not all. There are other things on wings too. They are ailerons, flaps, slats, air brakes. On most airliners, the engines are attached to the wings too, so their assembly takes up space.

On the two aircraft of your interest, here are the pictures:

A380 (its nickname is not jumbo, but superjumbo)
A380
Image Source

747
747
Image Source

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  • $\begingroup$ So that "center wing box" in the A380 does not hold any fuel? $\endgroup$
    – Bergi
    Feb 8 '18 at 23:45
  • $\begingroup$ @Bergi AFAIK, A380s don't have a center wing tank (CWT), unlike most other widebodies (both Airbus and Boeing). $\endgroup$
    – UnrecognizedFallingObject
    Feb 9 '18 at 2:26
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    $\begingroup$ Also, note that these images do not show the critical "dry bay" sections above the engines that are devoid of fuel tankage. These minimize the chance that projected parts from an engine failure will pierce a fuel tank and cause mass leakage onto a hot engine, leading to an uncontrollable, fuel-fed fire. $\endgroup$
    – UnrecognizedFallingObject
    Feb 9 '18 at 2:27

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