# The Great Ongoing Aviation Thread (general and other) (Part 1) **URL:** \ **Category:** Miscellaneous and Personal Stuff I Must Share\ **Created:** [October 23, 2011, 2:17am UTC](https://boards.straightdope.com/t/the-great-ongoing-aviation-thread-general-and-other-part-1/600499 "2011-10-23T02:17:01Z")\ **Posts on this page:** 1\ **Showing post:** 1358
**Author:** ![LSLGuy](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/lslguy/32/5813_2.png) [@LSLGuy](https://boards.straightdope.com/u/LSLGuy)\ **Post date:** [August 23, 2020, 2:37pm UTC](https://boards.straightdope.com/t/the-great-ongoing-aviation-thread-general-and-other-part-1/600499/1358 "2020-08-23T14:37:44Z")
> [@Elendil\_s\_Heir](#): > > Thanks - good to know! So the blade is not actually turning more slowly, your eye is just able to catch distinct views of it because of the turn rate? Correct. The frame rate of the video vs the rotation rate of the blades happens to coincidentally line up making for almost stop-motion photography. Here’s one of my favorites for that: [![]( " - YouTube") ](https://www.youtube.com/watch?v=Is0k0mCdeDk) It’s a vid of a Czech Air Force Mi-24 Hind attack helo doing an airshow demonstration. Throughout the demo you’ll see the blades barely turning. No helicopter could fly, much less maneuver aggressively, with the blades barely moving. The actual Hind has 5 equally spaced blades on the main rotor. At many points in the video you’ll see that it appears to have 5 equally spaced _pairs_ of blades close together. That’s also an illusion, when the next blade almost gets to the same spot in the rotation when the next frame is taken. Ina few spots you can watch the blade pairs merge or split; sometimes 5 blades, sometimes 10. More fun w frame rate: The rotor on a Hind rotates clockwise when viewed from above. Which means the blades are going forward on the aircraft’s left side and rearwards on the right side. In most, but not all, of this video you’ll see the blades going forward on the right side. In other words, the rotor appears to be turning backwards. --- _[View the full topic](https://boards.straightdope.com/t/the-great-ongoing-aviation-thread-general-and-other-part-1/600499)._