Hummingfrog,
Although your answer may make sense to those 'not in the know' about these and other experimental aircraft, it is fundementaly flawed.
To match the frame rate and thus give the impression of being stationary, the rotor speed would need to be in the region of 1800rpm for a highish quality 30fps video speed. Even if the frame rate was reduced to a level at which 'stuttering' would begin to occur, 25fps, the rotor speed would have to be 1500rpm. As you must be aware, these rotor speeds are impossible due to many factors, the main one being the tip speed, let alone the problems when forward speed is introduced. (The only helicopters with blade rpms that high are radio controlled models.)
I would estimate the Hinds MR speed to be considerably less than 500rpm, which even at that speed would require a shutter speed of 8.33 fps. You will of course realise that this is a ridiculously slow speed for video.
As mentioned before, the tail rotor is moving because it is the only method of yaw control available with either the main rotors rotating or stationary.
By the way, after the 'G' model, the winglets were increased in size to help performance in Afghanistan. However by this time the project was over.
Also, in '75 another branch of this project was experimenting with a fenestron for the Mil-24, which was a bit more succesful, however, when bringing the 2 projects together politics got in the way and again it fell by the wayside.
http://www.hrvatski-vojnik.hr/hrvats...52004/mi24.asp