Welcome to Synergy and the forums!
First, ensure your tail boom end is even with the bracket on the frame side. If the boom is too far in towards the gears, you'll end up with premature belt wear. You'll always adjust the tension from the tail box end.
What you'll want to do is loosen the tail box clamp bolts and pull back on it to put tension on the belt. Then from under-neath where the belt is exposed you push up on the belt with a small (non-sharp) object. You should get about ~2mm of deflection/give to the belt. Too much more than that and you might get belt slapping sounds and tighter than that could lead to premature wear or drag on the drive train. Tip:while you're checking this tension, leave the tail box clamps semi-tightened so that when you press on the belt it doesn't loosen back up or you'll end up frustrated.
Finally, there are some who say you can remove a lower brace because the tail box is strong enough (this is not required at all, just an option), I personally did not because I like all the parts on the heli but I'm sure someone else can chime in about that.
Regards,
Brandon Bartolomucci
Sent from my iPhone
