Step 8: Glue your Fin Supports

This is the added step for extra support. Glob out another dab of Epoxy and glue your triangle to the bottle and the fin. Glue the Supports on each side of each fin. Wait approx 10-15 minutes to be sure Epoxy has set.

Guess what... Your done all of the assembly at this point!!
You could take this rocket to the launcher at this stage and let it rip!
BUT... it's kinda messy looking isn't it?
One more step...
<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>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>I have to make a rocket for my 7th grade project, would a water rocket be a good choice?</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>
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!
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>

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