> two blades that counter-rotate around the same axis Which would make it a coaxial helicopter. https://en.wikipedia.org/wiki/Coaxial_rotors https://en.wikipe

> two blades that counter-rotate around the same axis Which would make it a coaxial helicopter. https://en.wikipedia.org/wiki/Coaxial_rotors https://en.wikipedia.org/wiki/Coaxial_rotors