Is it possible to disable RTL failsafe when the plane is on the ground?
I did this test, I removed the prop, then I connected up the battery without having the transmitter on, a few seconds later the motor start, and then I connected the telemetry and as expected the APM had detected failsafe and RTL kicked in.
Obviously one should turn on the transmitter and ensure the throttle is set to zero before connecting the battery, but I wanted to know what would happen if someone forgot to. I have been guilty of this a few times on my other aircraft, but luckily my Futaba and Spectrum gear just doesn't do anything when that happens. Not sure if that would still be the case connected to APM, but I know from my test that a RMILEC system + APM will result in the motor starting up. Big safety risk.
Maybe there is already a setting in APM, but it would be useful to have the APM not go into RTL/Auto if the airspeed/groundspeed is below X, and the altitude is below Y.
I agree it can be dangerous if you forget to disarm the device and turn off the TX and good practice (that I learned the hard way with a different flight controller - my thumb is now healed up) is to always turn on TX first and off last and ALWAYS disarm when on the ground.