What happens when you put a camera on a helicopter rotor

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Picture of BarraMacAnna29 achievements

+13 1. BarraMacAnna commented 11 years ago

This is because the camera shutter speed is synced with the speed of the rotor spinning giving the illusion that it has stopped spinning. Every time the camera shutter opens, the blade is at the same point as it was when it last opened. (You have probably noticed it in western movies too, where wagon wheels appear to have stopped spinning ;) ) The warped/blurred background is motion blur caused by a slow shutter speed, probably 30fps, a faster shutter speed would smooth this out.

Anyway, Trippy!
Picture of banzemanga46 achievements

+7 2. banzemanga commented 11 years ago

Interesting but too long.
Picture of nokster57 achievements

+1 3. nokster commented 11 years ago

oh my head!
Picture of captain_obvious38 achievements

+4 4. captain_obvious commented 11 years ago

now with a high speed camera
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+1 5. abriehat commented 11 years ago

not what I was expecting to see
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+3 6. Zeusisgreat commented 11 years ago

time travel :P
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+2 7. CorpseGrinder commented 11 years ago

#1 aye same as seen here from the ground: http://www.snotr.com/video/1963/Amazingly_flying_helicopter
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0 8. Benassi-MBeon commented 11 years ago

#1 Uhm, isnt he filming and not taking pictures? When filming, isnt the shutter opened constantly?
Picture of Judge-Jake53 achievements

+2 9. Judge-Jake commented 11 years ago

I would like to see size of the piece of bluetac used to hold the camera in place. :S
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+1 10. Teqskater commented 11 years ago

He is changing and bending the universe! I bet he can time travel too!
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+1 11. bejzik commented 11 years ago

matrix is coming back to haunt you! :x
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+2 12. Gorf commented 11 years ago

It's only partly to do with shutter speed.

Modern CMOS cameras which make high-resolution video affordable have a usually undesirable effect called "rolling shutter". Every frame is made up of 1080 separate moments in time, instead of the exact same instant every 1/25th or 1/30th (or whatever) of a second.

The first time the image appears to have settled back to its original state is when the rotor is at 1080rpm (or whatever the vertical resolution of the camera is. At 30rpm the image is from 12 different points in the rotor's spin - all cycling every 12 lines of the frame.

To further complicate visualising what's happening, the camera is recording in portrait mode - presumably so it can be more easily balanced when secured to the rotors.