What you are looking at here may not exist, but its likely to be the stealth heavy transport helicopter that carried backup SEAL commandos in the final hunt for Osama bin Laden. It looks appropriately powered by ninja stars. The blades design is striking, but not new. We have seen those before—a similar contraption is being used by Eurocopter engineers to attenuate the noise caused by blade-vortex interaction, the noisy whoop-whoop-whoop swooshing sound made by the helicopters rotor.

via This May Be the Other Stealth Helicopter Used In the Osama Attack.