RE: cut off switch for gas engines
I have done it every way you can think of, I personally like the Smart-fly and with it I do not put the main switch sticking out of the fuse anymore, the only thing you see is the LED telling you that the ignition is armed and I do that from my radio. I now leave the master on switch inside the fuse and when I get to the field I turn it on when I put the canopy on, it doesn't have any affect on my battery because the power to the ignition kill has low enough drain in the off position that I could leave it on a month and still have a weekend of flight time on my batteries.