The rubberband-powered helicopter is easy to construct, and with a little practice it can be flown 20+ feet into the air!
How It Works:
1. Energy is stored in the sport rubber by winding the propeller.
2. When flown, the rubberband rapidly releases its energy by unwinding, which turns both the propeller blade and the paper cutout.
3. The paper cutout pushes against the surrounding air, which creates horizontal air resistance, or drag. This makes it harder for the cutout to spin. Because the cutout does not spin as easily, more energy from the rubberband is released into the propeller, which is much easier to turn. In this way, the paper acts like the rear rotor of a real helicopter
4. As the propeller spins rapidly, it begins to create lift by pushing air downward. With enough energy, the helicopter will fly in whatever direction it is pointing.
Step 1: Materials
Materials and Tools:
6" hook nose propellers
Step 3: Paperclip
Bending and attaching the paperclip is usually the most challenging step for young kids in grades 1-3. I usually hold the end of the paperclip (on the right side of the photo) between my thumb and forefinger. Then I show how the paperclip bends inside itself. The students need to pull that inside bend apart from the rest of the clip.
Attaching the paperclip can also be tricky. It it's not properly attached, it can be ripped off from too much tension. I try to make it simple for my students: hold the paperclip flat against the craft stick with the tip of the thumb, then tightly wrap a piece of masking tape around it.
It helps if the two ends of the paperclip are separated by the craft stick as shown in the photos, but it's not necessary.