Well, I've not yet completed my first gasser, but it didn't take much convincing to realise that an opto kill was a wise investment! on the bench i've set it up on a separate switch to the idle down (throttle cut) so i can set a closed barrel with ignition off for choking my fg20, or with the engine running just use the idle down switch to enable me to experiment with finding the minimum throttle barrel opening for lowest stable idle. However, once i've found the ideal throttle barrel position for idle, i will set up the opto kill to work on the same switch as the idle down function. so with one switch flick it will kill the sparks and enable low throttle stick to close the barrel completely - belt and braces!

Just the thought of flying round an overpowered large gasser on full throttle, waiting for a 40 min tank to empty is enough to make me sweat - Even more serious is the possibility of a receiver failure or radio battery/wiring fault leaving you with no radio control and a running engine! Imagine how far a big plane will fly in 40 minutes - thats the beauty of the opto kill switch. Loss of receiver signal to the switch automatically cuts the engine - at least she ain't gonna fly away..............