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Hi,

Mr. Horace T. Pentecost founded Hoppi-Copter Inc company,he designed the HX-1 or

Model-100,a one man copter with two contra-rotating rotors,followed by Model-101 &

Model-102,evolved into the 1950 experimental Firefly with an 18' rotor powered by

tip ramjets.

He also designed a very cheap single seat Helicopter,also there was a Model-103 and

Model-104.

http://blog.modernmechanix.com/helicopters-for-everybody/

http://www.aerofiles.com/_h.html

https://sites.google.com/site/stingrayslistofrotorcraft/hoppicopter-model-103