Yes the video isn't great. I noticed he is raising the collective uncomfortably high then as it starts to lift he is dropping the collective fast but the helicopter doesn't react fast to his input. Would Aft blade CG cause this? or a improperly reflexed trailing edge? I think the ground anchors are pulling out of the ground at the end.Apparently at least 1. Too bad the video is useless in determining what that might be. Looked like roots but was cut off before anything could be reasonably observed.
Took the post down don't want no part of this at all. I am all for a guy building a helicopter but this guy is down right dangerousI've heard comments about tethers and ground anchors causing accidents, I can understand if an anchor pulled out the ground how that would obviously cause an accident but if that situation could be avoided then surely they would be safe? I was planning a test with my project with four ground spikes but this has made me think again.