I just got a Funtana 50X and put a TH 75 on it. I'm using a master airscrew 12X6 prop till it's broken in. 5 tanks on the ground and 7 flights running kinda rich to complete the break-in. I'm getting 11,500 RPM. In the air it is amazing. I putter around at about 1/4 throttle then pull up, give to gas, and do vertical snap rolls while it accellerates straight up. WOW! Idle is OK after some fiddling. Nice engine for the price.