5 ms·

I don't see any difference between the "incorrect" and "correct" examples

• fenomas 5y ago
  The speeds are different - the right one smoothly goes from stationary to the target speed, while the left one appears to speed up and then slow down again. It's explained further down the article.
• deleted 5y ago
  [deleted]
• nwallin 5y ago
  The difference isn't in individual flaps, it's in the entire animation. There's only a difference in the first two flaps, after that they're identical.
• baxuz 5y ago
  How. Like literally, how.
• Chazprime 5y ago
  Manually scrub through the first few seconds of the video - you’ll see that the start of the animation is different.