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 rubber band.
-Recommended: Rubber material to put onto wheels for traction.
-Full Spectrum laser cutter
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.