Bullet blimp.

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The difference between blade spacing and blade pitch angle is critical. The Cyclo rotor shell is not a propeller duct but prop pitch and spacing remain critical.

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This kind of coaxial gear can run the counter spinning rotor wing with one rubber band : The rear prop should have a deeper pitch to power the rotor wing. The front prop can help power the rotor wing with it's exhaust.


Lift is a factor of cubic meters of air over square meters of wing area.

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Watch this:

https://www.youtube.com/watch?v=BFmHfUvZOw8

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Removing the top and bottom of the Pepsi can but leaving a little bit on each end to support the rubber band and propeller would improve the flight distance and speed. Take note of the spiral twist in the fins.

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Nesting the propeller by ducting it inside the rim of the cycloidal wing would help. Simply recessing a stick frame inside the can and using a smaller propeller or moving to an Oatmeal container would work!