RE: 1/3 Scale 1913 Eastbourne Monoplane
I soldered a 100ohm, 1 watt resistor to one side of a momentary pushbutton switch. The resistor and switch (275-0618) were purchased at Radio Shack and provide an anti-spark mechanism when arming the power system. The procedure is to press the pushbutton and then arm the main switch about a second later. Although my 8s power system doesn't have much spark when compared to my 12s power systems, I have started using this approach on any power system above a 6s LiPo voltage (or 22v) to eliminate the pitting on battery connectors.
My arming system was complete and ready to mount in the Eastbourne cockpit.