ORIGINAL: OliverJacob
Some people like the optical switches and some don't. I have had a bad one and almost lost my plane. But I am sure this was an exception, they seem to work fine for most people.
The gasser can be killed with the throttle, just like any glow engine. Take that idle screw out and you can always use your trim to adjust a high idle.
Hmmmm, not always. Some Walbros have a dead stop on the throttle butterfly where it can't close completely regardless of where the idle screw is adjusted
Charlie the cam actuated killer is a good one. Simple and cheap
To the OP, consider the Tech Aero Ignition battery Eliminator Circuit, IBEC, rather than an OptoKiller. In addition to giving you the ability to kill the engine remotely, it also is used to arm the CDI remotely. You will have a single battery and switch to drive both the radio and the CDI. This gizmo is around 40 bucks and is well filtered so that your radio won't experience RFI. It also allows you to tailor the voltage that drives the CDI. Oh it saves you areound 5 ounces of weight too since you no longer need an extra ignition battery and switch.....plus another couple ounces if you decide to use a servo driven, mechanical device..... I use the IBEC. The IBEC weighs less than 20 grams BTW