Easy to Build, Easy to Use, Water Bottle Launcher!
Intro: Easy to Build, Easy to Use, Water Bottle Launcher!
Here it is... a simple water bottle rocket launcher that you can build in an evening and play with the very next day. I first saw this design at the Tunnel Mill scout camp in southern Indiana. Kids will have a blast (no pun intended) launching water filled 20oz plastic bottles 50 ft or more into the air, all the while getting their weekly shower!
STEP 1: Shopping (enough for 2 Launchers)
Shopping (enough for 2 launchers)
**** PRINT THIS LIST AND TAKE IT WITH YOU ****
Go to the hardware store and buy...
1 - 10 foot piece of 1/2 inch outer diameter PVC pipe.
8 - 1/2 inch PVC T???s
2 - 1/2 inch PVC elbows
6 - 1/2 inch PVC caps (you may want to buy a couple of extra T's, Elbows and Caps in case you mess up drilling or gluing)
1 PVC pipe cutting tool. Your really don't absolutely need this but it sure make cutting this pipe easier. You can use a hacksaw instead.
PVC Glue and cleaner (primer, often purple in color), comes in a two pack. Your neighbor probably has some you can borrow.
Go to the auto parts store and buy...
2 auto tire valves, also called Schrader valves. The end of them should be able to fit inside a 1/2 inch PVC pipe cap.
You will also need...
several 20 oz soda bottles. The ones that have previously held carbonated beverages. Wash them out or you may get ants!
An abundant supply of water. I like to take a 5 gallon bucket of water out to the launch site.
A standup bicycle tire pump.
A supply of neighborhood kids with dreams of becoming Astronauts! They will get wet!
A nice sunny day!
**** PRINT THIS LIST AND TAKE IT WITH YOU ****
Go to the hardware store and buy...
1 - 10 foot piece of 1/2 inch outer diameter PVC pipe.
8 - 1/2 inch PVC T???s
2 - 1/2 inch PVC elbows
6 - 1/2 inch PVC caps (you may want to buy a couple of extra T's, Elbows and Caps in case you mess up drilling or gluing)
1 PVC pipe cutting tool. Your really don't absolutely need this but it sure make cutting this pipe easier. You can use a hacksaw instead.
PVC Glue and cleaner (primer, often purple in color), comes in a two pack. Your neighbor probably has some you can borrow.
Go to the auto parts store and buy...
2 auto tire valves, also called Schrader valves. The end of them should be able to fit inside a 1/2 inch PVC pipe cap.
You will also need...
several 20 oz soda bottles. The ones that have previously held carbonated beverages. Wash them out or you may get ants!
An abundant supply of water. I like to take a 5 gallon bucket of water out to the launch site.
A standup bicycle tire pump.
A supply of neighborhood kids with dreams of becoming Astronauts! They will get wet!
A nice sunny day!
STEP 2: Cut the Pipe!
Using the handy PVC pipe cutting tool, cut the pipe into eight (8) one foot sections and four (4) six inch sections. Use a permanent marker and a ruler to measure before you cut. Measure twice, cut once!
STEP 3: Drill the Cap.
Put one of the pipe caps into a vice and drill a hole on the top of it that is big enough to fit the tire valve. You will only need two caps with holes in them (one per launcher). Go ahead and insert the valve into the cap from the inside, with the connector facing out.
STEP 4: Glue the Contraption Together.
It is now time to take your project outside because PVC pipe glue fumes can knock you out. Lay the pipes out on a drop cloth or newspaper. Read the instruction on the PVC primer and glue! Use the purple primer to clean the ends of the pipes and the insides of the caps, elbows and T's. Carefully apply glue to the pieces and fit them together. You do not have to glue the valve to the cap, air pressure will do that job. This is not rocket surgery (or maybe it is), there really is not much you can mess up. If you do, cut the pipe off and try again. A few inches here and there are not going to hurt your launcher.
Let the glue set overnight. Have a break; drink a 20oz soda or two.
Let the glue set overnight. Have a break; drink a 20oz soda or two.
STEP 5: Launch Day!
Gather your launcher, kids, 20oz soda bottles, bicycle air pump, a big bucket of water and excitement and take them to the launch area. Your launch area should be an open field, back yard, cul-de-sac but probably not your mother-in-law's living room.
Hook the pump to the tire valve. Fill your 20oz soda bottle 1/4 to 1/3 full of water. Carefully and quickly shove the soda bottle down on the launch pipe. Some bottles will fit on easily; some are going to be much tighter. Hold the soda bottle with your hands and have another person pump air into the launcher. When the air pressure is too great to hold, let go! KEEP YOUR FACE AWAY FROM THE PATH OF THE ROCKET! I told you that you would get wet.
Hook the pump to the tire valve. Fill your 20oz soda bottle 1/4 to 1/3 full of water. Carefully and quickly shove the soda bottle down on the launch pipe. Some bottles will fit on easily; some are going to be much tighter. Hold the soda bottle with your hands and have another person pump air into the launcher. When the air pressure is too great to hold, let go! KEEP YOUR FACE AWAY FROM THE PATH OF THE ROCKET! I told you that you would get wet.
93 Comments
HassaanN 8 years ago
PaperAirplaneandThings 9 years ago
This is a great idea! One major safety issue is that it is EXTREMELY dangerous to let kids hold the bottle while it is being pressurized. If the bottle hit someone or exploded at high pressures, someone could get seriously injured. I would consider using a release mechanism of some sort and an air hose to stay far away from the rocket. I can tell you it isn't fun to have your rocket explode on the launchpad.
phyrmon 13 years ago
charles.koehl.7 9 years ago
kateast 13 years ago
DanTDM 10 years ago
I hate getting wet, so I put on safety gogg
rlawrence5 12 years ago
In other words not using the full size open soda bottle, but somehow going to a lower dimension?
Seems to me it might go a lot higher as it would likely propel for longer rather than exploding it all out at the same time.
Jaygo 11 years ago
What you are trying to balance is a reduction of thrust to an lengthening of time of thrust. Reduce the outflow too much and you gain nothing or even lose in height. You already know the obverse.
asianpower89 13 years ago
SUGGESTIONS, PLEASE!!! We want to present this lesson in a few days!!!
bpwagner 13 years ago
When doing this with kids, be sure to have a safety briefing. I tell them not to go above 60psi, not to run when they want to chase the bottles and also to keep their face away from the bottle. They also wear safety glasses! Even so, I had one girl get a bloody nose from a bottle being launched. USE COMMON SENSE! Keep your face away from the bottle trajectory! If you are still having trouble, keep posting until we figure out your problem! Post a pic of your launcher if you need to.
Brian
tltarvin 12 years ago
Byoung4now 12 years ago
rlawrence5 12 years ago
Can you explain the O-ring idea? I've also heard tale of using cable zip ties to somehow use as a switch, but it doesn't really get past this initial sealing of the bottle/water issue that I would like to fix.
If I'm right in thinking, you have an outer sleeve over the 1/2" PVC with an O-Ring inside that sleeve that the soda bottle rim can push into? I'm thinking that it would still allow water to seep out between the launch 1/2" PVC and the rim of the bottle.
Byoung4now 12 years ago
https://www.instructables.com/id/water-rocket-launcher/step3/step-3/
Which puts a bulge in the pvc pipe to a more snug fit
Or like one of the comments on that one You can take a small file and put a groove in the launch tool for the Oring to snap into.
I used an oring that normally goes on a paintball tank but you can find them in the hardware store.
If you buy the o-ring from a non-paintball retailer, look for the standard 015 size o-ring - it has an inside diameter of 9/16th of an inch, an outside diameter of 11/16th of an inch and is 1/16th of an inch in diameter.
HTH
rlawrence5 12 years ago
butterflycookies 14 years ago
mwells4 12 years ago
bpwagner 14 years ago
mwells4 12 years ago
superawesomekid78 13 years ago