Board Thread:Lore/@comment-26073467-20151025022739

While strolling around on youtube I saw someone mentioned that (According to "the Lost Road") Numenorians may have had technology such as "airships, rockets, ironclad ships, primitive guns, Greek Fire, etc." in a comment

I was just wondering if any of these claims hold weight, and if they do, what kinds of implications do they have?  