For those wondering, the golden looking metal is called Aluminium Bronze, it's currently the go to choice for its toughness, corrosion resistance, and ability to prevent much of the buildup that other materials can experience.I always found propellers really beautiful things . They have a sort of perfect shape .Very little on the actual manufacturing process. I expected a “how it’s made” type documentary.Beautiful footage, too bad it doesn't always coincide with the dialogue. I'd think blades on variable pitch props could rotate 360 degrees (they can't) if I hadn't worked on them.