Hello, a few months ago I bought the FT Dart as my first flite test plane. I built all the foam and electronics for it, but have not been able to set it up with my transmitter. I have been using a Y cable since I am just starting out, and my transmitter is the TGY 9x (it was cheap and has very poor documentation). The flaps work perfectly, but when I try to throttle up the motors they spin at different speeds, and then their speeds switch! Does anyone have any idea of what might cause this? It makes no sense to me and I would be extremely grateful for any help you people can offer.