▁wings pan ▁of ▁ ▁and ▁an ▁all ▁up ▁weight ▁of ▁ 3 7 , 0 0 0   l bs . ▁However ▁it ▁was ▁under power ed ▁for ▁such ▁a ▁heavy ▁aircraft . ▁It ▁was ▁struct ur ally ▁advanced ▁for ▁its ▁time , ▁being ▁of ▁all - met al ▁str essed - sk in ▁construction . ▁The ▁D orn ier ▁Do ▁X ▁was ▁the ▁largest , ▁heav iest , ▁and ▁most ▁powerful ▁flying ▁boat ▁in ▁the ▁world ▁when ▁it ▁fle w ▁in ▁ 1 9 2 9 , ▁having ▁a ▁similar ▁span ▁of ▁ 4 8 ▁m ▁( 1 5 7   ft ▁ 6 ▁in ) ▁and ▁a ▁maximum ▁take off ▁weight ▁of ▁ 5 6 , 0 0 0   kg ▁( 1 2 3 , 4 5 9   lb ). ▁ ▁During ▁the ▁years ▁between ▁the ▁two ▁World ▁Wars , ▁only ▁the ▁Soviet ▁T up ole v ▁AN T - 2 0 ▁Maxim ▁G ork i ▁land plane ▁of ▁ 1 9 3 4 ▁was ▁larger ▁at ▁ 6 3 . 0 0 ▁m ▁( 2 0 6   ft ▁ 9 ▁in ) ▁span , ▁but ▁at ▁ 5 3 ▁metric ▁tons ▁maximum ▁take off ▁weight ▁it ▁was ▁not ▁as ▁heavy ▁as ▁the ▁Do ▁X ' s ▁ 5 6 ▁t onnes . ▁ ▁The ▁largest ▁air ship ▁ever ▁built ▁was ▁the ▁Ze ppel in ▁L Z ▁ 1 2 9 ▁" H inden burg ". ▁First ▁flying ▁in ▁ 1 9 3 6 , ▁the ▁H inden