Originally Posted by
dirtybird
Another useless old technology quote It was never even required on 72. All you neded was a plastic connector on the engine connector. I have used steel cable since 1957 on all of my airplanes.
The reason for the kill switch is the ignition engine. There have been cases where the throttle plate vibrates loose and engines run full throttle until out of fuel. Not as likely with glow engines. The old 72 Mhz receivers were likely a lot more susepeptible to noise than the current 2.4 Ghz receivers.