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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SamirR29 days ago

cool design

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

Tre-AnthonyL made it!4 months ago

it was hard but fun

Barrel Racer5 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?
DatCorgi5 months ago

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

starstruck0118 made it!7 months ago

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

cyenobite (author)  starstruck01187 months ago

Awesome! Nice Work!

I'mP cyenobite6 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?! =>


etison6216 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!!!!

KellyP16 months ago
(removed by author or community request)
KellyP1 KellyP16 months ago

omg what

kilans made it!6 months ago

this is awsome i love to make stuff life this

kilans made it!6 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.

kildevil9 months ago

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

kildevil9 months ago

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

kildevil9 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.

mmorel10 months ago

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

mmorel mmorel10 months ago

and also did u make them cyenobite

cyenobite (author)  mmorel10 months ago

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

dcon93010 months 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.

Zman888111 months 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.

kitty cat44511 months ago

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

cyenobite (author)  kitty cat44511 months 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! :)

Richard Horse 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)  Richard Horse1 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
reslami1 year 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!
cyenobite (author)  chocolatelover1 year ago
I answered this below - but because I'm nice I'll repeat it here... About a third of the bottle. (hint: if you bring one 2 liter bottle of water with you, you should be able to get about 3 launches). Hope that helps :)
I've found sprite bottles work very well with this project
AwkwarddAri2 years ago
I'm doing this for a science project :) I'll share my results soon! :D
MrBlobby1232 years ago
Amazing absaloutley flabergasting
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