Instructables
Picture of Rubber-Band-Powered Car
This instructable will explain to you the steps needed to bring an almost-fully custom pull-back car to life, using tools such as a laser cutter and CAD software.

The required materials to build a car similar to the one in this tutorial are about-
-One 12x12in sheet of acrylic.
-One pencil
-One rubber band.
-Recommended: Rubber material to put onto wheels for traction.

Tools used-
-Full Spectrum laser cutter
-Solidworks 2012
-Tape
-Round file
 
Remove these adsRemove these ads by Signing Up

Step 1: Design philosophy

The function of a rubber-band powered car is to be propelled forward by the elastic force provided by a rubber band when the car is pulled back. The mechanics of this are simple. You affix one side of the rubber band to the back axle(using tape, glue, bolt, or etc.). The other end of the stretched rubber band is placed on the front wall in a way that it can be pulled on but will not come off.

When you pull the car backwards, the rubber band is forcefully pulled around the axle by the torque that you indirectly applied to the wheels. This stores elastic energy in the rubber band. So when you release the car, the rubber band will quickly unwrap itself, applying torque to the back axle, sending the car forward.
I like the simplicity of it! have yo experimented with cutting ridges on the edges of the wheels to increase traction?
Coin3 (author)  amandaghassaei2 years ago
My original wheel design was a 3D printed wheel with ridges as you describe. But I believe that they wouldn't increase traction nearly as much as just making the edges a material such as rubber. The ridges might actually decrease speed and distance.