Wright Brothers aluminum-copper aircraft engine

Cited twice as the earliest precipitation-hardened aluminum-copper aircraft engine, now in the Smithsonian. Used to establish the hundred-year lineage of 2000-series aluminum alloys.

Then here's the aluminum alloy 7075, used to be the workhorse alloy for the skins of Boeing aircraft. 2024, which isn't on here but it would be down like 2014. 3003 is beer can stock, okay. 2024, 2014 are similar in strength, in the heat-treated condition, to the aluminum-copper alloys that we've been using for a hundred years. The Wright Brothers' aircraft engine case was a cast 2000-series aluminum like this, and it's in the Smithsonian.