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Caveat: I did not take these. I am however an Aerospace Engineer and seriously interested in this. Found these this past week and this thread reminded me about them:  The key to understanding what's going on is to realize both were taken with camera phones. They camera element doesn't take the picture all at once like a conventional digital camera or an SLR. Instead, they take pictures by reading each pixel panning and working its way down the sensor. That takes a finite amount of time which, it just so happens, is near the period of a rotating propeller. Here's a youtube video of a MATLAB program that explains visually how the effect occurs as the propeller rotates: http://www.youtube.com/watch?v=T055cp-JFUA Science!
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Nov 8, 2009 09:54
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| # ¿ Apr 27, 2024 14:35 |
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