Once you have made all the adjustments suggested in this thread, fly it. If it still turns to the left, observe if it wants to "roll" to the left, or "flat" turn to the left. If it rolls, your ailerons need to be tweaked, initially with the transmitter trim, and then manually on the ground. If it just wants to turn without rolling, it's the rudder, vertical stab, or engine offset. Make sure it's headed directly into the wind when you observe it. I had a Lanier "Comet" that I was stupid enough to buy and it had a warped and twisted fuselage. Finally got it to fly right by adjusting the control surfaces all out of kilter. Glen