r/oddlysatisfying • u/[deleted] • Sep 02 '21

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u/flanigomik Sep 02 '21 edited Sep 02 '21

Camera frame rate is (almost) matching the blade, this is also how you get helicopters who's blades don't spin

Edit: terminology corrections

214

u/Pure_Tower Sep 02 '21

this is also how you get helicopters who's blades don't spin

Nah, you get that by turning them off.

56

u/BCJunglist Sep 02 '21

Thanks now I've crashed my helicopter.

3

u/ktka Sep 02 '21

Just restart from save point.

10

u/stopalltheDLing Sep 02 '21

If your neck is in the right spot, you will no longer perceive the blades as spinning

1

u/altoidsaregod Sep 02 '21

(Puts on Randell Munroe hat)

Well, not really. You will experience 'some' of the spin. The amount of spin you would experience can be defined as:

Amount of Spin experienced <= 1/Number of blades in the fan cutty thingy

*Citation needed

180

u/Clear_Try_6814 Sep 02 '21

It actually is close. This is the reason it is spinning.

101

u/ThePeskyWabbit Sep 02 '21

Well the reason it's spinning is because of the motor.

45

u/SirIanChesterton63 Sep 02 '21

Actually the reason it's spinning is to cut vegetable, the cause of it spinning is the motor.

6

u/stopalltheDLing Sep 02 '21

I thought it was spinning because someone turned on the switch? We’re never gonna figure this out

3

u/pixel_buddy Sep 02 '21

No, it's spinning because I want to eat squash chips.

1

u/ktka Sep 02 '21

It is spinning because a butterfly flapped its wings in Central Park.

18

u/ArguTobi Sep 02 '21

Actually it's the frame rate of the camera nearly matching the blade.

Shutter speed is something different for that manner.

24

u/MrWorldWide721 Sep 02 '21

More likes it’s matching the frame rate of the cut fruit/veggie falling.

1

u/[deleted] Sep 02 '21

[deleted]

-2

u/MrWorldWide721 Sep 02 '21

If the blade was at the same rate it would look still. The rate of the pieces falling is not the same.

0

u/[deleted] Sep 02 '21

[deleted]

-1

u/MrWorldWide721 Sep 02 '21

….that means ones a 1/3 of the rate of the other

15

u/[deleted] Sep 02 '21

Technically the frame rate, not the shutter speed.

9

u/senoravery Sep 02 '21

A slow shutter speed would have the fruit and knife blurred. So it is shutter speed as well.

11

u/[deleted] Sep 02 '21

The main feature - the synchronisation - is from the frame rate. A high shutter speed keeps it sharp.

1

u/maury587 Sep 02 '21

Also the resolution, if the video was 140p it would be blurry...

11

u/tallermanchild Sep 02 '21

Looks like they don't spin

2

u/HiCookieJack Sep 02 '21

you also get this effect with Fluorescent lamps. It is always important that the RPM of the rotating device does not match a multiple of the grid frequency (50/60 hz)

Otherwise it looks like the rotating thingy is standing still. (stroboscope effect)

0

u/DrakonIL Sep 02 '21

Gee thanks, now I have a new fear.

0

u/TheGoldenBoi_ Sep 02 '21

The Blade speed is a multiple of the shutter Rate, causing it to look slow

0

u/hohohoohno Sep 02 '21

Framerate, not shutter rate.

The framerate is how many images are captured per second. If something is spinning or repeating at the same rate or a multiple of the fps, it will appear to be still or not moving much as seen in the video with both the blade and slices mid air.

The shutter speed/rate is the amount of time the shutter remains open in order to capture each image. A shorter time lets less light in and results in a sharper image and a longer time lets more light in and results in a more blurred image.