I'm pretty new around here and I'm excited to get started. I am going to attempt turning my first rc plane, a Nexstar .46 rtf (which has been sitting in the workshop closet for almost three years), into my first UAV. I'm planning on using the ArduPilot but I might wait for the ArduPilot Mega so I can use the IMUs instead of thermopiles. Is there anything I should be worried about using an engine instead of an electric motor? I also plan on converting the glow plug to a spark plug and ignition system so I can run FIA 0% nitro fuel. Any help and/or advice would be very welcome.