not practal on planes, but i had a JR, heli once with a pull start just like a weedeater. it was a g-23 zenoah motor and the heli weighted 10-12 lbs. it was called a Z-230 gasser,not made anymore. they are still around and guys used to ask for parts on runryder site. the spring type was around for awhile until cdi ignitions took over....................RON