A simpler title could be: Fun With Fan and Balloon

Most of us are familiar with Bernoulli's principle of high and low pressure areas generated by a speeding air column demonstrated with a ping pong ball held aloft by a hair dryer. A few may be aware that a balloon can be captured in the same way by a fan's air stream.
After watching this mesmerizing dance of a balloon with the fan I wondered how adding a control surface (rudder or wing) would influence the balloon. (Note: changes in orientation of the balloon can also be achieved by taping a small weight like a washer or coin to the balloon). The video shows the results of the experiment.

Possible uses of this demonstration:
- advertising might make use of a bobble head balloon - kind of mundane.

- by introducing smoke into the air stream one could utilize a free-standing wind tunnel model for the study of aerodynamics.

Or we could just have fun watching the balloon interact with the fan.

About This Instructable


1 favorites


Bio: I am an American teaching English at Shaoxing, I like making machines that do interesting but fairly useless things - I call them Quixotic Machines.
More by JimRD: Make a Passive Ramp Walker Toy Using Binder Clips and Wooden Dowel Goosestepping Robot (Passive ramp walker propelled by movable weight) Grip Strength Meter (Dynometer)
Add instructable to: