Please,Tell me what failsafe unit you are using?
I checked with Futaba tech support and they do not recommend their fail safe unit for aircraft.
next I checked with MPI and they said theirs would work but again they did not recommend it for aircraft and said use it at your own risk, same for venom all are design for cars or boats.
I would like to add it to me throttle on a ppm system, so at least it would cut the engine down to an idle if the singal is lost.
Wyldman