Others will probably know better than me, but on my wooden bat bones tricopter, I'm running 4S batteries with SunnySky 980kv motors, 30 amp ESCs, and 10" propellers. It isn't the voltage that will kill your motors and ESCs but rather the heat they generate. I think the general rule is that if you can keep your hand on the motor/ESC for 5 seconds without burning them, then they should be fine. I wasn't sure about using 4S batteries my 10" propellers so I flew it around for a short amount of time, landed it, then felt the motors and ESCs to check if they are hot to the touch. They were barely warm. I put 11" ones on and it flew around like a rocket so I moved back down to 10". I was originally flying with 9" and after flying around for over 10 minutes, my motors and ESC were cool to the touch... not warm at all. That is when I moved up to 10" - even now they are barely warm. If I get more FPV stuff loaded on it (more weight), I may try the 11" propellers again if I need more lift. If I was guessing, I'd guess the 11" propellers are going to provide a lot of lift for your tricopter with 4S batteries.