RE: Heavy verses medium classification.
Yeah, the Turnigy's operate by input alone, so you probably had a radio glitch and then blamed it on the Turnigy unit. When I built my first Tamiya tank I had a radio glitch, but never found a reason or cause and it never returned either.
I tried the Turnigy unit in my M4A1E8 and loved it IF it were wide open country, it is not favorable for closed in operations and I took mine off.
It's certainly not for everyone or every application.
- Jeff