The rubber band-powered helicopter is easy to create, and with a little practice it can be flown 20+ feet!
Interestingly, the paper cutout has a big effect on how well the helicopter works. Watch the full video below for an in-depth explanation.
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Tips and Troubleshooting
If the helicopter isn't flying very high, then...
Make sure to wind up the rubber bands until it's "double-coiled."
Practice releasing the helicopter's propeller a moment before releasing the bottom of the helicopter. See the video for details.
The paper cutout may be too small, or not wide enough. Try using a larger cutout.