A balloon helicopter is a toy helicopter made of a latex balloon and a plastic propeller. The most important feature is the hollow propeller hub which directs air into a passage in each propeller blade. The air passages channel air to the blade tips such that air escapes in a fine jet tangentially. The air jets on the blade tips causes the entire toy to spin, the blades have a positive angle of attack so the blades experience a lifting force as they push air downwards. It can attain a height of approximately 12 meters (40 feet). Full-scale helicopters have been built around this tip jet configuration.
See also 
-  Physics teacher Robert Douglas discusses Newton's Third Law and understanding force pairs with this demonstration using the Balloon Helicopter
-  A demonstration video of assembly and launch.
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