Cedar Rapids, IA
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October 1972 American Aircraft Modeler magazine. "Charybdis." Powered by a Cox TeeDee .010. Free flight. A friend of mine built one and would fire it up, and launch. Kept the kids at the flying site occupied, chasing it.
The original design was back in 1954, Charles McCutchen.
Several other videos of electric and nitro powered versions on YouTube. Look up monocopter.
* Making the World Better -- One Helicopter at a time! *