Balloon helicopter

Encyclopedia : B : BA : BAL : Balloon helicopter

A balloon helicopter is a toy helicopter comprised of a latex balloon and a plastic propeller. The propeller is driven by the pneumatic action of air escaping from the balloon, traveling through nozzles embedded within the center of the propeller. The propeller's rate of rotation increases as air continues to leave the balloon, creating lift and causing the device to fly in an upward direction.

A typical balloon helicopter, at full capacity, can fly for approximately 20 seconds and can attain a height of approximately 12 meters (40 feet).

From Wikipedia, the Free Encyclopedia. Original article here. Support Wikipedia by contributing or donating.
All text is available under the terms of the GNU Free Documentation License See Wikipedia Copyrights for details.