I just recently started a blog today because i didnt have time to actually make one, though i already came up with some ideas of designs for my rubber banded-powered car. so technically i really did do my hw but here are some designs that i though would work out..
<i like this design because its a three-wheeled car which means its sturdier and lighter than a four-wheeled car. i would replace the string to a rubber band and i would build some kind of base to hold the weight.
This design is good too. It different from the first one because the way the rubber band is used to power the vehicle. but the only thing is will it be fast and sturdy enough to carry a weight. 
< The design im leading more towards is this one. But then again there are some things i would change like using a rubber band instead of a string and it would be a three wheeled car instead of a four wheeled.
other than that its just a matter of trying things out and customizing them to make it the best car possible. sometime this week as well i am going to buy the materials with the help of my dad.
