There are many videos going around showing helicopters flying apparently without the aid of their rotors. Here is the best example of this type of illusion to date.
Why does it look as if the helicopter is levitating without power? Is it possible that the helicopter is on a wire being lifted by a second copter just out of sight? I think that this is a Top-Secret test of a helicopter fitted with an anti-gravity prototype device, caught on tape by conspiracy theorists. Remember, just because your paranoid doesn't mean they aren't out to get you.
The answer to this question is simple enough. The frame rate of the camera and the copter are in sync thus creating the illusion of a copter being able to fly without it's rotors turning. The fact is the rotors are turning like always it just doesn't show with this camera setup. Or is that just what they want you to believe?
Here is a military test of the anti-gravity device caught on tape. This one uses the Mi24 helicopter seen here in this image.
This military Mi-24 HIND was the first helicopter to enter service with the Russian Air Force as an assault transport and gunship.
So what is the true reason these helicopters can fly without their rotors turning?