Picture of Soda Bottle Water Rocket
In a couple of hours (or less) you could make this water rocket! Water rockets use water and pressurized air to launch a soda bottle(s) 100's of feet into the air. This instructable will NOT cover the launcher. I hope to later come back and write up an instructable for a launcher. There are many websites with water rocket plans (and launchers) part of the fun is to experiment and come up with your own designs. Feel free to modify, improve, experiment with this instructable and post your results in the comments. The original inspiration for this rocket was from the magazine called "MAKE Magazine" ( Issue #5 has full instructions also.
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Step 1: Materials

Picture of Materials
List O Materials...

> 2 Soda Bottles (empty)
- Note: There are slight differences in the openings of the bottle depending on the soda brand. Pepsi is just a tad smaller than Coke. -
This Instructable is set up for 2 liter sized bottles - feel free to adjust for any size though.

> 1 sharp knife (kids get your parents help here!) I prefer X-acto brand for cutting foam core.

> 1 Large sheet of Foam Core (I prefer Black, but any color will do). Foam Core can be found at almost any arts and crafts supply store. To learn more about foam core try wikipedia:

> 5 Min Epoxy (This stuff is nasty! Do not inhale, and use in a well ventilated area. Do NOT get it on your skin or eyes, or hair, etc... read all safety warnings before using.) Feel free to experiment with other glues. This can usually be found at any hardware store - kids, ask your parents for help with this glue.

> 2 (or more) Markers - I used Sharpies, one black and one Silver

> Clear Shipping Tape - It's thicker than regular scotch tape and about 2" wide.

> 2 (or more) cans of spray paint - Pick your own favorite colors!
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Hey I have to make this fort 8th grade end of year Honors Geometry Project. My teacher gave no take home instructions. Now, after making one, I am debating if you are supposed to cut the bottom of the bottle off and then tape the cone on, or leave the bottom off, and then tape the cone on. Some one help!!!
cyenobite (author)  fungdoodle783 days ago
Hello Fung, Good luck with your project. If I understand your question... you have to leave the bottom on the one soda bottle, and put the cone on top of it. There is a LOT of pressure buildup, and I don't think any amount of tape or glue would prevent leaks if you were to cut the bottom off of the main bottle. If you want to try it, by all means, but I can't see it working well.
I thought that this was a very difficult project and I probably won't do it again but it was fun. I did it with a class and that made this much easier cause we could bounce ideas off of each other to help make this easier.
Tre-AnthonyL made it!7 months ago

it was hard but fun

cyenobite (author)  Tre-AnthonyL1 month ago

Awesome paint job!

HooIigan1 month ago
So I just made one last night with it being due today (I'm a huge procrastinator) and let me say it turned out awesome. Didn't take long to do, maybe 2 hours at the most. Pretty easy to follow instructions and overall just great. I'll post a picture of it later.
cyenobite (author)  HooIigan1 month ago
Awesome! Glad it all worked out for ya!
SamirR3 months ago

cool design

really came in handy with a school project but what powers it and how does it get powered

Barrel Racer7 months ago
Im doin a rocket like this for a Physics project. We have to use a parachute. Where would we put a parachute on a rocket like this n for it to work?
DatCorgi8 months ago

When launching it is it safe to put the cap screwed onto the top?

starstruck0118 made it!9 months ago

Here is a picture of my rocket. Thanks, again cyenobite!

cyenobite (author)  starstruck01189 months ago

Awesome! Nice Work!

I'mP cyenobite8 months ago

do you think you can make an instructional video or send me a link to a video on how to make one please?! =>


etison6218 months ago

Hi, I have to make one of these for school. The challenge is to keep it up in the air for as long as possible. Any tips for that?

My eighth grade science class is making these. I can't wait to see the finished product and see it launch!!!!

kilans made it!8 months ago

this is awsome i love to make stuff life this

kilans made it!8 months ago

this is awsome i love to make stuff life this


Thank you cyenobite. This was very helpful. I made the rocket, but still did not paint it. I will post a picture soon.

kildevil11 months ago

I'm making this rocket but i don't get how to fly this do you need to use a pump or ???

kildevil11 months ago

I'm making this rocket but i don't get how to fly this do you need to use a pump or ???

kildevil11 months ago

out of curiosity how do you make this launch, there isn't like a way to launch? do you shake it to make it launch or...... plz tell me asap i need help, this is due next week and me as a student wants to know how to make this rocket and we can make any type and i saw yours and it looked awesome, i got surprised when i just saw this, unbelievable.

mmorel1 year ago

I'm doing a worksited for a school project and I wanted to know if i could use the diagrames?

mmorel mmorel1 year ago

and also did u make them cyenobite

cyenobite (author)  mmorel1 year ago

Yes, I made the illustrations myself. You're ok to use them for personal use and your school project. Thanks for asking.

dcon9301 year ago

A friend of mine did a similar project, but instead of fins, he taped cut-up, smaller Sierra Mist plastic bottles, around it. This worked well, getting the rocket up 300 or so feet.

Zman88811 year ago

Hey cyenobite, I'm building this for a project in school, but there is a requirement that you must have a parachute. I'm just curious as to how I could add one to this design.

is there any substitute for the foam borad? p.s luv ya

cyenobite (author)  kitty cat4451 year ago
Sure, you can always use regular old cardboard for the fins. Just keep in mind that you want something to be light. Cardboard/paper can be very heavy. But you could probably use a thin piece (like from a cereal box), and just use some sort of extra support where the board would attach to the bottle, so it wouldn't fold over or flap in the wind.
Good luck!

okay dokay thnx

super sam1 year ago
You rock
cyenobite (author)  super sam1 year ago

Ha - thanks Super Sam! :)

Logan Hanssen made it!1 year ago

This rocket design is amazing! It went very far and high. i decided i didn't need to paint it though.

cyenobite (author)  Logan Hanssen1 year ago

Great Job Richard! I'm glad it worked out for you!

Is there a good substitute for the foam core? I'm just curious about it.
cyenobite (author)  PaperScissorsRocket1 year ago
Foam core is nice and light, but I'm sure that regular old cardboard would also work just as well. Good Luck!
Shadow boy1 year ago
Can we use the pump that inflates basket balls
jtcreates1 year ago
reslami2 years ago
how would you use the foam core and the 5min epoxy is my question? And also what would you do to make a nose cone for the rocket.? please message me back I would really be thankful.
how much water (in cups or milliliters)? PLEASE ANSWER i have to launch my rocket tomorrow at school and we have to know and bring how much water we need and i cut the bottle that goes on top way shorter than yours i also used coca cola bottles just wondering if that affects the amount of water needed PLEASE ANSWER and THANK YOU!
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