Today my flying buddy and I took an old Sig Banshee with a throttled engine, with a servo, a battery, and the timer I'm working on, and went flying.
The timer counts laps, and can detect loops. We could reliably end a flight by doing two or more consecutive loops. The timer would detect the loops, then at the end of the last loop would put the plane to full throttle for exactly one lap, then cut the engine dead.
This was done with an IC engine, because that's what I have. But it could have been done even easier with an electric plane.
Who says you need an IC engine and a mostly-empty fuel tank to do a cutoff loop?