The guy in that series of video's died piloting that same helicopter recently, they have a bearing in the tailrotor power belt system that gets pretty hot from the pressure and because it's poorly engineered it will seize.
The late pilot had made a home-made cooling apparatus that wasn't fastened down well and it went into the Glimer belt and destroyed the belt stopping the tail rotor. He wasn't high enough to get it to autorotate, ( if indeed they do at all?..) and was going too fast.
There's a guy who lives fairly close by who owns one of these that has put a small turboshaft engine on his. I'm surprised he hasn't bought the farm already, he's kind of an idiot.
The thing that is totally mind blowing, is that he purchased the micro helicopter kit, has spent umpteen thousand on a tiny turboshaft engine conversion, and then made a exhaust deflector out of an old paint can. You should watch the series of his videos, he's the luckiest human alive and he's replacing the turboshaft engine because he's too cheap to have bought an ECU for the engine, he regulates the turboshaft's speed with a needle-valve, when it should ECU governed.
His YT user name should be changed to LarryCanDieHorribly