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Old 12th Feb 2020, 01:18
  #1212 (permalink)  
Agile
 
Join Date: Jul 2014
Location: South East Asia
Age: 54
Posts: 323
Received 33 Likes on 21 Posts
I would bet its a visual effect of the camera shutter. Same reason blades appear to bend cord wise.
That amount of flapping (if real) would induce huge lead-lag strain, just thinking.
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