No VBar test by Jonas Wackershauser
What happens, when there is no flight stabilisation on the helicopter. Jonas has made a test with a Mikado Logo 690. This video is quite interesting, and it helps to understand why an FBL is a must have.
Important: DO NOT TRY THIS AT HOME. There are some preconditions in this case. This experiment can work with large helicopters and very low RPM only with NO WIND at all. Higher RPM or smaller helicopter will produce all these effects much more quickly and way more suddenly. Even a smaller gust can lead into a disastrous situation.