Duralumin is an alloy of aluminum with copper, magnesium,
and manganese composed within the following
liits: aluminum – over 90%; copper – about 4%; magnesium –
0.5% to 1.5%; manganese – less than 1%.
|Thirty-nine duralumin rings attached to lateral girders
formed the lightweight but strong 803-foot-long framework of the Hindenburg