learning to balance a prop - (Microvib II Aircraft Analyzer) 

I use the microvib 2 quite a bit for tracking and balancing helicopters. Heres 3 things i have learned. Never lie to it, tell it exactly how much weight you put on and where, the first few runs do very small changes, some aircraft like the ones in this video are programmed very well and you can get it in just 1 move. Some aircraft like most bell helicopters are not and require you to move 1 weight in some direction and do another run. Typically it makes it worse for the second run and it will learn based on that data. By the 3rd you should be pretty close to perfect. Lastly is more for helicopters but only make on change at a time, if you change a weight on the head and create a shake when your running both tail balance and head balance your gonna have a bad time. I suppose in your case the tip is dont try to balance with 2 engines running at the same time

Hay can l be able to contact the specialist