How do you do that from the transmitter? With a servo? An optical kill? It is an AMA requirement that you are able to kill any Gasoline engine from the transmitter. Manually grounding out the spark is not acceptable.
Wings,
Yes, from the transmitter, not manually. I use a separate servo on a [link=http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXJ776&P=ML]Great Planes kill switch[/link]. This also has a manual switch if you want to do it manually, or for extra protection against accidental starts.