My 3 in 1 unit has taken a poop on me i think and my servos keep destroying their gears . When I raise collective the rpm changes but the pitch angle does not. I have changed the servos and have had no luck fixing the problem. The helicopter would hover then drop a few feet like a rock then resume a hover. This is my first heli and I do know how to fly it now but can't figure out what is wrong. Please help if its the 3in1 Please let me know how much you would like for yours I would buy new but these prices are killing me. [email protected] Thanks sean