Gomig-21
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Watching a documentary on this superb aircraft, it has a special type of non-degradable foam inside all the fuel cells of the aircraft. Any areas inside the aircraft where they've designated as fuel tanks, they fill that space with this foam so that all the fuel gets absorbed inside that foam and becomes stable when the aircraft is moving all over the place and it isn't slushing around from side to side or needing a special pressure bladder like other aircraft have that needs to shrink as the fuel is use up etc. That way they're able to designate a lot of space for a lot of fuel giving it that incredible range it has. I thought that was pretty interesting and not sure if any other manufacturer's use foam like that.