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Amazing Video Effect At Farnborough  
User currently offlineA380900 From France, joined Dec 2003, 1118 posts, RR: 1
Posted (4 years 5 months 2 days 7 hours ago) and read 2314 times:

In all the videos I've seen on youtube about the A400M at Farnborough, I've been struck by a strange effect: it looks like the propeller is moving at very slow motion. I guess this has to do with the frequency of the movie cameras and the number of blades. Can anyone shade light on this amazing effect? (or is it: 24 pics per seconds with 8 blades => three times slower?)

I think it's the first time there is a propeller with that many blades. Does that explain it? It could be the speed of rotation as well but it does not seem to change in different flight configuration (landing, take-off etc...).

Example:

http://www.youtube.com/watch?v=Y_phb3aoF0k&hd=1

but watch other vids, it's always happening.

Not sure what it is but one thing is for certain: it looks pretty cool! Especially with the contra-rotating propellers.


NB: Also I post it here because this is a video issue and has nothing to with the A400M being a military aircraft.

[Edited 2010-07-24 07:21:41]

3 replies: All unread, jump to last
 
User currently offlineWestWing From United States of America, joined Feb 2005, 2135 posts, RR: 7
Reply 1, posted (4 years 5 months 2 days 7 hours ago) and read 2267 times:

See this video for another example of video frame/rotor sync: http://www.youtube.com/watch?v=Dyisg9-Mwjw


The best time to plant a tree is 40 years ago. The second best time is today.
User currently offlineA380900 From France, joined Dec 2003, 1118 posts, RR: 1
Reply 2, posted (4 years 5 months 2 days 7 hours ago) and read 2244 times:

Ok, now this beats the A400M hands down! So I guess it is not a matter of the number of blades. Can someone explain. I vaguely remember studying that in physics when I was 15 but I could definitely use of refresher. Also, I don't remember seeing that during first flight. Different video equipment?

Also with a close-up, one could see pitch variation be it for the helicopter or the propeller... I guess people testing turbo prop engines have been using that for a while. Or turbo fans for that matter.

[Edited 2010-07-24 07:34:24]

User currently offlineB6JFKH81 From United States of America, joined Mar 2006, 2902 posts, RR: 7
Reply 3, posted (4 years 5 months 2 days 7 hours ago) and read 2190 times:

Quoting WestWing (Reply 1):
See this video for another example of video frame/rotor sync: http://www.youtube.com/watch?v=Dyisg...-Mwjw

That's an AWESOME catch!!!   



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