Feda Dragonfly Low RPM Vibration
Helli everyone,
My Feda flies real well, but sometime the heli vibrates violently when I attempted to decent about 1 foot off the ground. I took off again and the probelm went away. It happened randomly, so I cannot repeat the symptom at every fly. I had carefully balanced the fly bar, main blade, tied, and loosen the screws that hold the main blade, but it still happened some time. I am an electrical guy and not mechanical, so the vibration is still existing. Please give me your expert knowledge. Many thanks.
MTDV.