Took me a while to find out what is an optimum voltage to fly this model, initially thinking it was a 6S set up, I have decided on 5S - running hot, test flew it even on 6S - almost cooking all the E-components after short flight, finally realized after further search it was designed only for 4S.
Wish I have known right from the start to save me all the initial dramas and wasted time.
LOL now, after each enjoyable flying session, running smooth as a silk. I like it.

Almost cook it after some 4 min. flight on 6S!!!

Mini helicopter outing day.