Antigravity Perfected
Of course, the real explanation here is that this is a stroboscopic effect, aka the wagon wheel effect — the rotor speed and the film speed are matched (to some ratio) so there is no apparent movement of the blades for each frame of the camera.
Try it yourself and alias your monitor’s refresh frequency
Comments
Comment from drew
Time: April 19, 2008, 4:38 am
315 rpm.
Comment from drew
Time: April 20, 2008, 2:45 pm
Turns out I had misidentified the helicopter. The one in the video is an Mi-2, and it turns out to have a rotor RPM of about 240. A 30 or 60 Hz video recorder divides 240 evenly.
global RSS feed.
Comment from the tree
Time: April 18, 2008, 6:56 am
That’s pretty cool, how fast are the rotors on something like that?