I need help. I need to design a device to transport a 1kg pass ten meters over a level surface using the energy stored in a #10 rubber band. I decided to use three wheels at the structure, and i created a car with a basswood top and the rubber band is wounded up at the rear axel to get power. however when i release it, there isnt enough power to move it. any suggestions on what kind of design i should do? how i should build it? i really need help!