 | Severed propeller?| Modern Discuss Severed propeller? in the Other Eras forums; This photograph was posted on this site...
Google Image Result for http://www.boingboing.net/IMG00005.jpg
...asking for an ... |
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06-11-2008, 06:34 AM
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#1 | | Senior Member
Join Date: May 2007
Posts: 1,403
Country:  | Severed propeller?
This photograph was posted on this site... Google Image Result for http://www.boingboing.net/IMG00005.jpg
...asking for an explanation... "I was travelling in a Bombardier turboprop plane recently, looked out my window and saw the propeller. Thought it would make a nice picture, so I took out my cameraphone.
The picture is attached. Unphotoshopped. There are propeller blades that appear to be floating, and that appear in a path that is outside the normal path of the propeller. Not sure what to make of it."
One 'answer' is given, from this site... Google Image Result for http://www.boingboing.net/IMG00005.jpg "The effect of the turboprop picture is caused by the propagation of the charge across the sensor field. All sorts o "ghost" and "UFO" proofs are starting to show up from digital pictures."
What is he saying in laymans terms? | 
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06-11-2008, 08:01 AM
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#2 | | Senior Member
Join Date: Dec 2007
Posts: 1,534
Country:  | I can't explain that myself mate, but that makes for an interesting picture...
Last edited by A4K : 06-12-2008 at 03:14 AM.
Reason: typo...
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06-11-2008, 08:03 PM
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#3 | | Senior Member
Join Date: Feb 2006 Location: George - South Africa
Posts: 2,556
Country:  | It does look as if the blade is not attached to the prop, but it is. To the human eye and if you take a picture it looks the way it looks.
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06-11-2008, 08:54 PM
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#4 | | aka Dickcheese
Join Date: Apr 2005 Location: Washington State
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Country:  | BS
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06-11-2008, 09:02 PM
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#5 | | Senior Member
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Country: | Quote:
Originally Posted by Matt308  BS | The photo, the explanation, or both? | |
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06-12-2008, 05:34 PM
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#6 | | aka Dickcheese
Join Date: Apr 2005 Location: Washington State
Posts: 10,079
Country: | Oh sorry Graeme. Didn't see the explanation. I thought your post was asking if this was a pic of an actuall prop separation. Read it too fast. Yeah, some sort of artifact related to camera speed being a harmonic of the prop. Kinda like watching a wagon wheel where the harmonics of shutter speed of the camera are such that you see the wheel slow down, stop, and then speed up again. That would be my guess.
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06-12-2008, 06:17 PM
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#7 | | Senior Member
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Country: | Thanks.
Possessing no photographic knowledge, I thought the 'Wagon Wheel Phenomenon' died in the 'digital age'. | |
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06-12-2008, 06:25 PM
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#8 | | aka Dickcheese
Join Date: Apr 2005 Location: Washington State
Posts: 10,079
Country: | Maybe it did. But the digital cameras still have variable shutter speeds and processor clocks controlling the CCDs, so I'm thinking that a comparable speed between the object being photographed and camera speed (or a harmonic thereof) is likely what is causing the stroboscopic effect.
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06-12-2008, 10:22 PM
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#9 | | "Shooter"
Join Date: Sep 2004 Location: Moorpark, CA
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Country: | Nope, still happens in digital. I have a shot of the Bearcat where the prop blade is near the numbers on the nose, and the numbers literally look torn.
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06-12-2008, 10:42 PM
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#10 | | Senior Member
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Country: | It that the result of the stroboscopic effect through the propeller arc, or the combination of it, plus the forward motion of the aircraft? | |
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