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" (makezine.com). Issue #5 has full instructions also.

Step 1: 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: http://en.wikipedia.org/wiki/Foamcore

> 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!
<p>I have to make a rocket for my 7th grade project, would a water rocket be a good choice?</p>
<p>Same Question, Same Grade</p>
<p>for extra power you can use a heavier liquid which has a greater density than water, like syrup or you can use carbonated water which is easier to pressurize so faster launches</p>
<p>really </p><p>it does how high does it go</p>
<p>hi how do make a bottle rocket</p>
Hello, this is a really cool rocket design. I wanted to know how far it travels because I have to make one for a school project and we are graded on the distance. Thanks so much!
<p>the design is stable and honest. to extend distance traveled try using a more dense liquid, syrup(s), or a liquid that already has a noticable amount of gas dissolved in it like sparkling or carbonated water as they do partially(sort of) compress when pressurized. water is an easily available and stable liquid and even dissolving stuff in it like different salts could effect the distance traveled(hint, hint) but it is something you should experiment with yeah? kero syrups, different waters etc try lots of stuff. also make sure the cap is on rocket nose and possibly sand or abrate the lip that catches the cap. anything that might effect the aero-dynamics even use some of the stiff foam to make a cone( cone would be better than pyramid) and cover the top part of the rocket. foam is good because it is light, you could use a heavier material like balsa wood or the like but remember weight is not your friend if you want to go the distance</p>
<p>how many mil. water do you put in it</p>
<p>1 liter </p>
<p>Can I launch this rocket on a dry launcher (without water)?</p>
<p>Thanks for the design it really helped me</p>
<p>are the soda bottles 1 liter bottles?</p>
<p>the are 2 liter bottles</p>
<p>Is there a video to this? So I can see how much pressure the rocket is?</p>
<p>You should probably use 45-60 psi</p>
<p>that is an awsame idea! i Love rockets</p><p>lol</p>
<p>what exact foam core did you use?</p>
<p>how do you keep the cut in the middle so air-tigh?</p>
<p>It makes so much sense now! I cut the bottom of each bottle ant tried to tape them together.</p>
If I understand you &quot;Hamster&quot; :)<br>the cut in the middle is mostly for just the way the rocket looks. It's to put the second soda bottle over-top of the &quot;primary&quot; soda bottle. This gives the rocket some extra length. <br>ALL of the pressure is stored in only the First Soda Bottle. <br>Hope that made sense.
<p>Does this rocket work if you use vinegar and baking soda instead of water pressure?</p>
Hmm, I'm going to say &quot;maybe&quot;... I'm not sure what sort of pressure can build up by the reaction of the vinegar and baking soda. When we launched these (almost 10 years ago!) I think we were pumping up the internal pressure to around 70 or 80psi (if memory serves). <br>Sorry I can't give you a better answer. <br>Try it - and post your results!
<p>thanks great idea</p>
Can I add a parachute on this and if so how?
<p>There are <strong>lots </strong>of ways you can attach a parachute to a water rocket. I would recommend something like an air flap or timer system, or if you're willing to spend some money, a flight computer or magnetic apogee detector.</p><p>Here is a very reliable timer based version:<a href="https://www.youtube.com/watch?v=bVpJqoHQBm0" rel="nofollow">https://www.youtube.com/watch?v=bVpJqoHQBm0</a></p><p>Here is a magnetic apogee detector version:<a href="http://www.aircommandrockets.com/construction_7.htm" rel="nofollow">http://www.aircommandrockets.com/construction_7.htm</a></p><p>another one: <a href="http://www.uswaterrockets.com/documents/LaunchPad_AlTImeter/manual.htm" rel="nofollow">http://www.uswaterrockets.com/documents/LaunchPad_AlTImeter/manual.htm</a></p>
<p>he is actually right that's a couple of wayz</p>
<p>yes u can and I will make an instruct able in about a month on how so keep posted!</p>
You can try. I didn't feel the need, as it is fairly durable (unless it crashes onto pavement or hard dirt, the nose might get caved in, but with mine, I just pulled it, and the nose popped back fine. You can *not* tape the nose portion of the rocket to the main body, and loosely attach it (with tape and string) to the body, then the parachute could be stored in that loose nose section. In theory, when it hits the apex, the nose will 'fall' off and the parachute will deploy. I won't guarantee this will be a good plan. But feel free to experiment. If it works, please post back here and let us know! Good luck!
<p>guyz I made the rocket don't have pic because I used a launcher and it broke cause it went really high.</p>
<p>pics of my soda bottle water rocket i made for 2 of my nephews. tried to make it look like Iron Man</p>
<p>Looks Great! Always cool to see photos!</p>
<p>hey cyenobite, i was wondering what type of tape did you use to give extra support for the fins before you painted the rocket?</p>
<p>hi ghostwolf76, I actually did not use any tape at all when it came to the fins. I just glued them on using the epoxy, and they I added the small triangles for the extra support (also epoxy). The only place I used the shipping tape was to seal the one bottle top onto the other bottle. Hope that helps. </p>
<p>it step 9 it shows the tape and you said you put tape for extra support on the fins before you painted it.</p>
<p>Oops sorry, you are correct. (I built this almost 7 years ago! :)<br>If memory serves, I just used the same shipping tape, cut into smaller pieces. I think the shipping tape was good and strong, and didn't stretch much (like masking tape or duct tape would be too flexible). Hope this helps. Good Luck!</p>
<p>ah thanks. i used electrical tape but as soon as i painted over it, the edges and corners curled up lol</p>
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!!!
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.
<p>it was hard but fun</p>
<p>Awesome paint job!</p>
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.
Awesome! Glad it all worked out for ya!
<p>cool design </p><p>really came in handy with a school project but what powers it and how does it get powered</p>

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