Good stuff, John. I built my RV-4 with toggles and a pushbutton (and a diode), figuring that a motivated thief could easily get past the key switch anyway. It occurs to me now that the propellor of an unattended plane with only a pushbutton poses a potentially lethal risk should some bonehead reach in and start pushing buttons. I know it's unlikely, but if some idiot accidentally chops his friend to bits with my prop I know exactly who'll get sued
. I think this build will have a keyed switch somewhere in the system.