My initial problem was my copter falling out of the sky when it loosened 4 of it's 6 props due to the motor nuts thread direction vs it's spin direction (i got CCW motors before i knew better).
I'm building a hybrid UAV with a Pixhawk flight controller for use in a competition. As far as i've understood a requirement of the competition is to have a back-up power supply for the flight controller ONLY (does not power any actuators). I thin