Heli-paper above your head as shown in the diagram, then drop
What's Going On?
You have made the type of "wing" used
by helicopters. It is called a horizontal rotor. The shape
of your rotor causes it to twist due to uneven drag on the
paper surface. The rotor begins spinning and this reduces
the pressure above the "wing". The pressure underneath
the spinning rotor is greater and pushes up, allowing the
helicopter to drift slowly down rather than falling quickly.
Real helicopters lift up when the motor spins the rotor at
Else You Can Do
Put a paper clip over the folded
part. See if it changes the flight pattern.
Click here for Heli-Paper Pattern