Lets make It!
Step 1: Safety
This is a pressure vessel. Pressure is dangerous. This bottle rocket launcher will utilize pressures up to 60psi. If you want to, you can add a safety valve but it would be easier to regulate the pressure with the source of air pressure. In my case, my portable air compressor.
Make sure you use pressure rated PVC pipe. sch40 is recommended but I used another type rated to 260psi
As with any pressure vessel, be cautious around it at all times.
ALL components MUST be pressure rated.
Do not use pressures over 60psi. There is no need. No increased performance at all!
Step 2: Parts
Here is the list of the parts:
8x 10cm 15mm PVC pipes
20cm 15mm PVC pipe
3x 15mm 90 degree Elbow fittings
3x 15mm "T" fittings
15mm to 25mm coupler
4x 15mm PVC end caps
1 hose barb to threaded fitting.
1m (25 inches) of air compressor tubing
1x schrader valve (from bike tire)
2x hose clamps
10m of cord
15cm of thick wire
"O" ring to fit over the pipe
Step 3: Assemble Without Gluing
Trill 5mm holes at the top of the 15mm to 25mm coupler. Put a small screwdriver through the holes once a water bottle has been "loaded". The way that the launch mechanism works is that it stops the bottle from leaving the launcher by putting a pin through the holes over the little "lip" that the bottle has. When the unit is pressurised, the pin is pulled and the rocket launches!
Step 4: Start Gluing
Step 5: Finishing Up Construction
Drill the hole and thread in the hose barb for fitting. I used liquid nails around the threads to keep it from coming out at pressure and to ensure a good, tight seal. I used hose clamps to keep the hose barb fitting connected to the tubing and on the other end, the salvaged bike tyre valve, also with a hose clamp.
If you want to, you can use some waterproof spray paint and paint it. That is going to be the next thing on my to do list.
Step 6: Results and Math
Step 7: Finishing Up
If I can improve this instructable in any way, let me know in the comments.