ORIGINAL: Bob Pastorello
X3
{General Editorial Observation - not targeted at anyone} - I've been in the hobby since the 60's.....running all sorts of glow engines, up to the big Supertigres....and until I ran gas engines, it NEVER, EVER, occured to me that a ''kill switch'' on them would be a good thing. Mechanical failures, pushrods, servos, mounts, etc. all pose the same risks as gassers. Yet, in the Gasser realm - and I include myself in this - I would not even THINK of running one without a radio-controlled, transmitter-based Kill device. Wonder how come we never felt so strongly about this on glow? A YS 140 with a 17'' prop could cleave a LOT of meat....
In some racing venues they did. One way I remember was to run the fuel tubing to the carb through an eyelet. A servo would cause the eyelet to pinch the fuel tubing, thus starving the engine of fuel. I seem to remember there being some fuel shut-off valves being marketed too.
CR