Step 11: launch it

Step 11: TEST IT! (do this outside--expect to get wet)
Fill a 2-liter bottle a third or half way with water. Push the bottle on to the bulge on the pipe (a little bit of water will spill--that's ok). Lock the bottle on with the cable ties and big pipe, as explained in step 8, above. If the big pipe does not stay on, line the inside with duct tape as explained at the end of step 8. Hook a bicycle pump to the tire valve. Once you start pressurizing the bottle, you must keep the launcher pointed toward the sky until the bottle has been released. Consider it to be like a loaded gun.Start pumping air. If the pump has a pressure gauge, pump up to 70 psi (5kg/cm) or whatever you can comfortably reach, but not higher. If it starts leaking (and assuming the bottle does not have a hole in it), then you might have to further adjust the trigger but If it is a slow leak, you might actually want to keep it that way because it disarms the launcher if some knucklehead leaves it around pressurized.

With the launcher pointing to the sky, pull the rope...HAVE FUN!

<p>a good idea and i made it ,it was good</p>
<p>We made this launcher for our LED Bottle Rocket Fireworks. One change we made was instead of heating the pipe we filed a grove and used a O-ring. Also, we made a square base. Very nice instructable, thank you. Thank you. </p>
I made this yesterday - Mostly I just copied the release mechanism, but here's a couple things that made it easier for me:<br><br>The bulge: My bottles fit snugly on the pvc, so the bulge is very slight, the pottles fit very snugly.<br><br>The Valve: I used a 1/8 npt Schrader valve, It just threaded into the end cap, and then I epoxied it for good measure.<br><br>Also I made the valve point up with another elbow, which prevented water from getting in the pump.<br><br>I'm easily filling regulate bottles to 100psi.<br><br>Thanks,<br> Skymeat
Instead of heating the pvc pipe up, use a file and make a groove around the pipe as evenly as possible. Then wrap some duct tape, teflon tape, or electrical tape around and along the groove. It's not a good idea to heat up pvc pipe for three reasons: 1. PVC is called Poly Vinyl Chloride. 2. If it catches fire, it burning will release chlorine gas. 3. If the melted plastic drops on you, it burns like heck (I learned this one the hard way).!
I'm sorry but your first point was just acknowledging that PVC stands for Poly Vinyl Chloride. Your second point is untrue. Burning PVC does not release chlorine gas, that's just asinine. Chlorine only naturally exists in bonds. When PVC burns the chlorine creates airborne dioxins, which are no more harmful than airborne table salt, which contains chlorine as well. Your last point, while correct, is off base. Bending PVC pipe requires heating it until soft, just like a metal. If you heat it to the point where you are dripping the PVC, which in its usual state is a polymer, so should resist dripping anyway, you have done something horribly wrong. Lastly, by filing the PVC pipe you are weakening it much more so than bulging it, in a pressure sensitive environment this could lead to shattering of the PVC, which is a much more real and hazardous situation than the points you make in your post.
thanks i will try it
i did as you said and also i saw it on youtube...<br /> the launcher was awesome !<br /> <br /> i have a little problem in the bulging area using the candle.<br /> <br /> i did the bulge , but that bulge was not proper !<br /> <br /> i used a insulation tape so that it would stand&nbsp; , still i have the leaking problem .<br /> <br /> sugest a way to stop the leaking from the bottle .<br /> <br /> thanks<br /> apun_121<br />
Well, could you heat up the bottle and squeeze the neck/part with threads so that it would be smaller? Or you can find a piece of PVC that fits just right around 1/2&quot; PVC and cut the neck of the bottle off and glue the piece onto it? Just an idea...
Just built an air cannon. there has to be a to mod it to do the rockets also. <br />
hey I am considering trying to make a water bottle rocket bazooka and I need a good release mechanism any other ideas for one? I looked at pitsco and found they have one I could buy that could screw of the bas its one but its $40 not assembled.
HEARING PROTECTION!!<br /> do not test this device on your shoulder without hearing protection..
<a rel="nofollow" href="http://www.instructables.com/id/Water_Bottle_Bazooka/">This option</a> might be a useful one, it won a contest so it should be good Tell us about it when you're done!<br/><br/>: )<br/>
garden hase attachment will find website i found the idea of
<a rel="nofollow" href="http://home.people.net.au/~aircommand/construction.htm#Launcher">http://home.people.net.au/~aircommand/construction.htm#Launcher</a><br/>
what are your requirements for it? on this on you have to have it at a slight angle for it to seal.you could probaly make a cool trigger design for it ...i will make a video and post it when the weather gets warmer>
thanks, unofrtunatly it may be postponed due to certain cercumstances, but yes i was hoping for a good trigger design. Right now i am working on my first instructable, although it is not yet complete due to money issues, and may not be for a month or two unfortunetly.
&nbsp;I know this is an old instructable, but I just built one.. it is far in advance of some of the other launchers I found here, but I found an improvement to this step.. after such a graceful design, I was disappointed when I had to create friction using duct tape as described in this step.. I chose to create a four-ziptie contraption at the base of the trigger-pipe, notched the pipe and pulled the ziptie's slack into the notches, melting them in place.. the mod allows the friction to be adjusted so that it won't fall down, but is still loose enough that &nbsp;my launcher does not fall over when the string is pulled, taa daa!<br /> <br />
&nbsp;Your latch mechanism is truly ingenious.&nbsp;
wow very cool hey if u want to see how to make an easy water rocket check out my instrictable!
It really isn't very nice to advertise your instructables inside other instructables without the authors consent ;)
Could this technology be used in a barrel and shoot water balloon-tipped rockets horizontally (not at people)? I think I might be able to do it by layering balloons in the bottle to create thrust, but is there an easier way?
I watched the same show and came up with a similar design. I don't like the match and melt approach, so I used a 1/2 pvc coupler at the point where you would expand the pvc pipe. I added a piece of rubber where the bottle and the pvc coupler meet to get a tighter seal. I don't really like the zip-tie coupler. When we pressurize the bottle, the zip-ties and hose clamp tend to slip. I need to re-do my zip-tie / hose-clamp setup. I'm going to try a design where everything is the same, but I put a ball joint control valve in-line and use that to release the air flow... I am thinking that this will give less pressure since the water won't be pressurized..... My kids really enjoy this one...
Hey, guys, check out the Youtube version of this, it's updated and newer. I built one, decorated it and the bottle, and it flies GREAT! all my friends are interested, but the task is too daunting to complete by themselves, so they just borrow mine. I'm currently working on my own design using this trigger system.
<strong>Great job, Robert! </strong><br/>I was catching up on my episodes of <em><strong>Ask This Old House</strong></em><br/>and saw, I think, the exact same design. Is that you by chance?<br/>
same same.. saw that episode few days ago...
If you modify it, you can put water balloons on the rocket and make it look like a RPG7, it would be a water balloon launcher
I built a bottle rocket launcher that's alot simpler than this. I'll try to post it soon
I made this and it looks awesome but it keeps raining so I can't launch it.
mythbusters idea??? (straws)
nice instructable although!!
I made a similar launcher. Mine is different in that I made the pvc that goes up into the bottle shorter so we can launch smaller bottles or rockets that have been smashed from rough landings. Also we use a compressor so we can launch 100 rockets in less than a hour. Kids love that they get wet launching the rockets. Our trigger is a piece of pvc that slides over the body of the launcher connected to four 4 foot strings that connects to the pvc that compresses the cable ties. Keeps the rocket at least five feet above the students heads.
your trigger and lock system is pure genious
instead of your confusing trigger that could shoot off any time try using a water hose quick release holds high pressure and fits on to 3/4 in. PVC.<br/> if you sand down the threads and use Teflon tape!!<br/> and the other end is like a rocket spout so it shoots a small fast stream of water out the back end, and the up sides to that is that it fits perfect to a 2 liters threads! that is the best way to do it !! '<em><strong> </strong></em><br/>
no. you pull a string and it fires. also this one is better because it has more airfkow, which makes it fky higher
i beg to differ i make a cannon that did the same thing you did with your launcher and it didnt go jack as far as mine did well it dont matter i might hav accidently screwed up one of the steps!
Very good!
Very Cool!

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