Is a new SC (super custom) 120 Ringed, by the manual the recomended prop is a 16X8 I am using a 16X6 APC as I was with the TT120 PRO, plug is an OS no 8, running it in my garden it drops 8500/9000 with the 16X6 revs but if you hold the throttle for a bit it gets hot. I could try as supose with a 16X5.5 or a 15X7, but seems to small for it, thanks for your time!