Our current flight envelope protection system prototype runs using a combination of a Pixhawk autopilot for sensing, serially connected to an Odroid embedded computer. Both devices are powered using the main battery. The Odroid sends back command limitations to the Pixhawk output channels to limit the control inputs whenever the safe input sequence set algorithm determines that the current input sequence is not safe. The input limits are chosen to maximize pilot authority, and allow the exploration of the full flight envelope of the UAV.