MAIDEN DISASTER!
It lasted less than 10 seconds, after rotating to some 3 meters I didn't know if I was "Arthur or Marther"! It was just about totaly out of control, rolled on me twice, so I was in such a panic state can't even remember which way it rolled as it happened so quick.
It was only a miracle I managed to slam it down on its landing gear, which suffered a minor brake but I can't believe there is no structural damage to the frame after close inspection, because after this short horrific experience I was sure it's the end of this one.
It took only few more grams of added weight to fix it shortly after but more soul searchin will be needed to find out what's wrong.
Sadly, while being in a hurry to test it in semi darkness, twilight eve dead calm I didn't bring my cap cam to record the drama which would be very handy to analyze the problem. LOL- just a part of RC modeller life.