# Pop can catapult

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1. Mar 16, 2015

### George Mihaylov

Hello everyone.
Not only that I only have High school physics but I don't even remember most of the physics I learned in high school, so when the idea of creating a pop can (354ml aluminium can) launching catapult that can launch the can at a 10 meter hight and 15 meters far came into my head I quickly realized that projects its going to be above my capabilities. So I googled around and came across some pictures of catapult designs that might do the job but I still need help with the calculating the dimensions of the thing that's why I registered here to see if someone might want to help me with that.

This is the design I like because I have all the tools to work with wood and I can replace the rubber bands with Bungee cord, but this is obviously too small and I have no Idea how to calculate the angle that I need to stop the arm at or how long the arm needs to be to achieve my goal of 10 meters high and 15 meters far.

In summary I want to build a catapult that will:

Use 354ml pop cans as AMMO
Shoot the pop can 10 meters high at its Peak
Shoot the pop can 15 meters far (While being 10 meters high)
Be made mostly out of wood (except the steel rod that will go through the arm)

Thank you very much in advance.

2. Mar 16, 2015

### Evanish

3. Mar 16, 2015

### George Mihaylov

Thank you for replying and the suggestion. Yes I looked those up and I couldn't find anything that is not too complicated or too big for my needs. I forgot to mention that I need this catapult to be easily transported in the trunk of a car if that's possible. I really hope that the design I found will do the job, because I think it's easy to build, but not being able to calculate what dimensions and angles I need to use is where I am stuck. I don't want to build it two or more times, but if everything else fails I will try the Trial and Error method.

4. Mar 16, 2015

Staff Emeritus
Are the cans full or empty? Hopefully empty - a full can would be dangerous.

5. Mar 16, 2015

### George Mihaylov

Full cans. The catapult will be used only outdoors and in a very safe manner. :)