The craft appears to have 5 blades. This means that the rotor speed can be 1800/5 = 360 RPM.
Sorry Dave, but that is a ridiculous calculation to make and a basic PoF error when it comes to these matters. Besides, using your calculations the frame speed would be 6fps, again resulting in a very stuttered video clip, which of course it isn't.
ShyTorque, being Russian, of course the technology is named in reverse.
The Stealth Blade project was a very serious matter in the late 70's/80's. Many a time, Lynx patrolling along the IGB would be flying alongside a Hind, yet not until they actually saw the aircraft did they know it was there, it arrived unheard!
So to some degree the Soviet Stealth Blade must have been operative and relatively effective.
It also highlights the different working ethos between the East and West.
The Soviets had 'Blade Stealth' (BS),
Whereas we had the 'British Experimental Blade Project' (BERP)
http://www.whl.co.uk/history_timeline4.cfm
It just goes to show that although we worked on technology that was a very serious matter, especially given we were in the Cold War era, the British still maintained that loveable schoolboy sense of humour.
On the ground, still think we should have had a different tactical refuelling method, in that the Forward Refuelling and Arming Points (FARPs) were replaced by smaller detachments, less detectable close to the frontlines and called these units, 'Forward Arming and Refuelling Teams'.