Instructables

How to make a simple pull-back car(rubber band powered)

Picture of How to make a simple pull-back car(rubber band powered)
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This is a simple instructable that tells you how to make a rubber band powered pull back car.
THINGS YOU NEED
*rubber band
*kebab skewer
*straw
*cardboard
*2 old CD's
*a toy car
*glue,scissors,compass,tape,pen.
WHAT TO DO

1.Cut out four cardboard squares and keep them aside.
2.take the straw and cut out 2 small pieces.
3.Tape/glue these pieces to the piece of cardboard.(this joint has to strong)
4.put glue around the hole in the CD and stick one cardboard square on it.tape it to make it stronger.Do the
same on the other side of the same CD.Do the same on the other CD.
5.Mark the center of the CD on the cardboard(stuck to the center of the CD) and using a compass make a small hole on both
the cardboard pieces on the sides of the CD. Repeat on the other CD
6.Insert the kebab skewer into one of the CD's.Now put the other end of the skewer through the straws on the cardboard and put the other CD on the other side of the skewer.
7.Attach the toy car to the other end of the cardboard piece on the underside.
8.Loop a rubber band around the exposed part of the kebab skewer and stick it with tape or glue.
9. The other end of the rubber band and stick it to the front of the cardboard.
10.pull back the car.The rubber band will wind around the axle(KEBAB SKEWER)and when you leave the car, the rubber band will unwind and in the process turn the axle and thus the car will move forward.
julianm012328 days ago

what was the width and the length of the cardboard square??

AriyanaS1 month ago

this help me a lot for my project

1strawberry1 month ago
What forces are acting on this car?
rogonow1 year ago
I made a pull-back car with free-wheel and clutch, although that is not so simple. http://roelaro21.twentyone.axc.nl/press/elastic_rubber_car_clutch_freewheel.mp4
killshott1 year ago
I dont think this car would go more than a foot. The rubber band is clearly taut, and taped in place. After you wind it up and let it go, the rubber band will unwind, causing the car to move forward, but then, because the rubber band is taut and affixed to the axle, it will act as a brake, preventing the axle from further spinning.
TiDi11 year ago
im doing this for a grade 8 science project, most people arent doing pull backs for this, i know the "other materials" question has already be answered but what about having the 2 back wheels be closer together? it would focus the power in a smaller area, but it might affect the direction, so i was going to have the 2 back wheels be closer together and have the 2 front wheels be more than double the distance apart than the back wheels, do you think that would work?
sidgupta (author)  TiDi11 year ago
It should work but if the front wheels are very far apart then even a slight deflection of one of them (due to weak joints or errors during attachment) can cause then car to change it's direction by a lot.
Put Balloons over the cds to add traction. Cut a hole at the top of the balloon and the neck of the balloon so you can stretch it over the wheels. This will enhance your performance greatly.
you could also have thick elastic bands and cut small grooves into them instead, it would be harder but if there is any excess material from the balloon, then it would cause more draft but i do agree that it would work
sidgupta (author)  jackjackboom2 years ago
Thanks at lot!
Kittencat11 year ago
Can the materials be replaced with different materials
sidgupta (author)  Kittencat11 year ago
Yes
sidgupta (author)  sidgupta1 year ago
What would you be trying to use?
susanrm2 years ago
This is so cool. I was just thinking about how to make a car like this. Do you just use the toy car for small wheels? Why not just add something else that can form small wheels, such as bottlecaps or something? I want to play with this... my nephew would love it.
sidgupta (author)  susanrm2 years ago
You can actually use an old wheel/bottle cap etc.just make a hole through the center and bend a paper clip to make an axle.I used a toy car because it is more convenient and easy.
susanrm2 years ago
Oh, and can you post a video of the car in action?
this is the coolest of your entries. I wouldn't mind losing to you.
sidgupta (author)  artisnotfart2 years ago
Hey thanx.