World's 1st manned quadcopter flight (youtu.be)

The plane containing all the propeller blades goes through the operator. It's cool, but I wouldn't go anywhere near it.

Also, it's worth noting that this isn't a quadcopter; it has many more than four rotors.

I has 16 rotors, so it's quadquadcopter :)

Anyway, great result, but no rollcage and rotors on the same plane as pilot body kinda produce safety concerns.