Plane Propeller Recorded With Cell Phone

Submitted by: Naz14 7 years ago in Weird

Hey propeller, you"re doing it wrong! [We think this is called the stroboscopic effect?]
There are 51 comments:
Male 117
I believe it`s to do with how terrible phone cameras are - they record a part of the image at a time and work downwards, therefore for each frame they record different parts of the image at slightly different times. This just happens to be the effect a rotating blade forms.
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Male 221
OMG! That video was so interesting. Some propellor looking as if its falling down. Some pretty amazing stuff there.
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Male 29
I`m cheesed. and Wow... that`s some trippy stuff
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Male 147
remember, modern cameras can only record are around 25fps, so if the propellor if rotating at higher than 25 revs per sec, this video is only showing part of the rotating action, thus this effect :)
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Female 43
O_O i just cant understand it. . .. dear God!!
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Female 536
holy hell, that is weird!
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Male 137
... and it only looks like that in a camera, not in real life. Stupid laws of science governing the abilities of our modern cameras being infinitely inferior to our own eyes, why do inferior things have to make superior visual effects!
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Male 621
The balls, I am tripping 0.0
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Male 3,915

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Male 554
Ok, now just imagine you happened to eat some shrooms just before take off and saw this through your camera! Oh poo we all goin die!
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Male 840
Caught on camera. Now you know how airplanes work.
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Male 493
It`s rolling shutter effect + wagonwheel effect (rolling shutter making the propellers look so bizarre, and the wagon wheel effect giving the illusion of frame to frame coherence so it looks like the little propeller boomerangs are moving slowly downwards). Really, really cool.
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Male 964
Would the window have anything to do with it?
I hope not because this freaking awesome!
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Male 61
Yeah, this happens because the rate that the propeller blades are passing in front of the camera lens is very close to a multiple of the recording frame rate of the phone. I`ve heard this called the "wagonwheel effect", because you can see a similar thing with wagon wheels in movies, for example.
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Male 493
I`m going to turn on some Jefferson Airplane and watch this for ten minutes straight.
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Female 406
Why am I a bit dizzy from that?
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Male 914
This is called the rolling shutter effect.
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Male 6,693
Now that is pretty cool. No. Very cool.
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Male 2,893
SWAH SWAH SWAH SWAH SWAH SWaH SWAH.
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Male 1,360
it`s a good thing the prop has plenty of spare blades.
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Male 697
so the radius of the propeller is the distance from the centre to the bottom of where you can see stuff moving... i think
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Male 157
Propeller blade`s rotational frequency is pretty close to a multiple of the camera`s shutter speed.
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Male 2,424
Acid phone is on Acid.
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Male 176
Propeller blade speed > phone frame capture rate
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Male 394
F*cking magnets, how do they work?
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Male 313
i call shenanigans
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Male 759
Frame rate of phone = lacking!
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Female 5,222
whoa.. 0.0
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Female 533
this is a total mind f*ck
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Male 3,076
that is just cool
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Male 1,547
I could have saved a lot of time by telling you that these things work by magic.
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Male 72
Angilion...


WTF are you talking about? They`re BOOMERANGS. They don`t go flying away they JUST COME RIGHT BACK.
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Male 12,365
Hmm...as the blades are identical, it isn`t necessary to match rpm/number of blades. A multiple of that will do.

e.g. 1000rpm prop speed with 5 blades will appear stationary at 200fps, 400fps, 600fps, 800fps, 1000fps, etc.
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Male 12,365
Damnit, IAB is running on buggy software. Is it ever going to be fixed?

Here`s the link:

Or a helicopter
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Male 12,365
[quote">its cool, but i would have imagined that it would be blurry.[/quote">

That would depend on the exposure time, which is a different thing.

What you`re getting from this camera is this:

Picture taken in a very small amount of time.
Delay before the next picture.
Picture taken in a very small amount of time.
Delay before the next picture.

Repeat.

So in the very small amount of time during which the picture is taken (very small exposure time), the propeller hardly moves any distance. The picture therefore shows an unblurred propeller.

By the time the next picture is taken, the propeller has moved a bit.

So you get a sequence of unblurred shots with gaps in between.

If you vary the rate at which pictures are taken so that it exactly matches (rpm of the propeller/number of blades) you will get a video of the plane flying with stationary propellers.

Male 12,365
[quote]Those boomerang things are bound to hit someone on the ground, how do they even get away with this?[/quote]

Another engine of this type is suspended under the plane, upside-down to the one you can see. This therefore absorbs the boomerangs and converts them into energy which is fed back to the engine you can see converting energy to boomerangs.

Propulsion occurs as a result of the loss of potential energy as the newly created boomerangs fall, so the power of the engine is varied very simply by raising or lowering the lower engine.

As an added safety measure, the boomerangs are made to degrade very rapidly. If they fall more than about 150 metres, they will have dispersed into dust.

Rather an elegant and efficient system, really, and very safe. There are no reported cases of any of the boomerangs ever reaching the surface, let alone hitting anyone.

Absolutely true, every word of it!
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Male 600
its cool, but i would have imagined that it would be blurry.
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Male 25,416
IF thats real thats awesome, if its not good show old chap!
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Male 74
@wellsy57
If they dont know how to copy paste. They dont belong on the internet.
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Male 4,014
Thats awesome looking
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Male 5,314
haha, where is it going?
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Male 2,748
O.o that`s crazy!!
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Male 206
Those boomerang things are bound to hit someone on the ground, how do they even get away with this?
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Male 74
Trippy!
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Male 313
What do you call that window I said was an editor window? Did I get that right?
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Male 313
@i-IS-BORED
If you click the `link` button to the right of the editor window, you can actually make a working link for someone to click. Just a friendly tip for ya. Otherwise, newbies might not understand what to do with an un-clickable link.
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Male 1,081
What manor of propulsion is this!?
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Male 4,807
I suggested this link over a week ago.
This is about the 5th one that shows up many days later.
I`m just wondering which mod I pissed off.

Having said that... its still a pretty cool effect.
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Male 2,419
for those who don`t get why it looks like this on a camera
youtube.com/watch?v=T055cp-JFUA
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Male 378
Neat
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Female 1,571
Link: Plane Propeller Recorded With Cell Phone [Rate Link] - Hey propeller, you`re doing it wrong! [We think this is called the stroboscopic effect?]
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