(1) There is an old thread:
However the link of the file is dead.
(2) I also found a C4D file, but the site does not allow me register to their database. It says my country is not supported. :/
Basically, I want to animate the opening of the blades, like in this image.
I don't have a firm ground on C4D (just the basics) so I don't know where to start with the animation, let alone the proper tools to make it. I badly need help.