The propeller doesn't seem like it's spinning fast enough to generate so much lift but I suppose it must be. Impressive
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None — 5 years ago(July 28, 2020 09:22 PM)
It’s the iPod Touch version of the Wagon Wheel Effect
You’ve probably noticed that wheels sometimes appear to spin backwards on film or television even when the vehicle they’re attached to is moving forward. This phenomenon is known as the Wagon Wheel Effect, and it’s caused by undersampling and aliasing.
A movie camera samples the light entering its lens 24 times per second. Recalling the Nyquist-Shannon Sampling Theorem, we know that our camera will be unable to properly film any phenomenon which cycles at a frequency greater than 12Hz. Whenever the camera undersamples, there will be an apparent reversal of motion when playing back the film.
https://jackschaedler.github.io/circles-sines-signals/sampling4.html -
Dances with Dimwits — 5 years ago(July 28, 2020 11:11 PM)
It's got to do with the framerate of the sample, basically an optical illusion to video, it wouldn't look like that if you were watching it with your own eyes. I'd go into more detail but you're just as capable of googling **** and pretending to already understand it as I am.