I was reading an old American Modeler magazine today from 1965. In G.H. Stines', monthly column. "Rocket Trails", he made mention of Electric Field Model Rockets. I had never heard of this so I did some internet research and found the following:

http://www.rexresearch.com/dudley/dudley.htm

I hope you enjoy this

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"Old Rocketeer's don't die; they just go OOP".....unless you 3D print them.