Whistling Balloon Helicopter
- Balloon Helicopter
- 2 balloons
- Rises up to 6 m!
- Instructions on the pack
- Suitable for children over 5 years
- Whistles when flying
Warning: Small parts
This balloon helicopter is derived from the balloon rocket.
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 6 meters (20 feet).
An amazingly simple but extremely effective way to demonstrate action and reaction. Newton’s Third Law has to be applied twice in order to explain the upward motion of the balloon helicopter!
The exhausted gases force the fan to rotate, driving the air downward. The reaction of wind, in turn, provides the lifting force for the helicopter.
Balloons made from latex.