1:40 The effect where it looks like it is rotating in reverse is called aliasing. Aliasing can happen when the flicker of your lights matches up with the speed of the spiral. If the flicker is the same speed, the spiral will appear to be still. If the flicker is faster or slower than the speed of the spiral, the rotation will seem to slow down or speed up. The shutter speed of the camera can cause aliasing to appear in the video.
@dinosatay3 жыл бұрын
side note: there are many footage of helicopters flying with a still propellor because of this trick and they look goofy as heck, it is also called 'rolling shutter' as in camera shutter since the time limiter this time is not the light flicker but the fps of the camera
@Chocomint_Queen3 жыл бұрын
It happen in real life too, not just film and artificial lighting! Wagon-wheel effect can happen with car wheels spinning fast under sunlight, for example. Reason is not fully understood.
@hiranotk2000312able3 жыл бұрын
Thanks, thanks to you, I became familiar with aliasing.☺️
3:45 You taught me something about this machine! I thought the spiral had to spin freely inside - it does not! This makes it so much easier to construct!
The second spiral is actually called an “Archimedes Screw” or something. It was developed in Ancient Greece and is considered a wonder of engineering despite its simplicity.
@lui5gif2 жыл бұрын
@@gregoryford2532 the captions say Archimedes *spiral*, not screw
Inspirational! WHAT IF ... you could make a megastructure with this rotational energy being provided by the thermal gradient between the ocean's surface and (say, for instance) the cold water a mile or more down? This thing would be able to survive and provide energy through an ice age!
@SerunaXI3 жыл бұрын
Are you making a turbine, or trying to use an Archimedes screw?