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Building a Pressure Testing valve

PL Premium Construction Adhesive (if you use shrader valve from bike inner tube)
Cap from the size bottle being used
Schrader valve from a bike inner tube, or bought from the store
Drill & bit that fits
Razor or hobby knife

Set the cap on a scrap piece of wood so the top is facing the board. Drill a hole, as close to center as possible, it is not necessary to be exact. Cut the Schrader valve out of the inner tube, and to a size where it fits almost perfectly. If the rubber is too thick for a bottle to screw in very much then you may have to thin it by taking a knife and shaving it down. Put some PL in the cap and push the valve through the hole tightly. After that sets up, which should take about an hour, fill in all gaps around the rubber with PL. Let the glue cure overnight, after that, you� re all ready for testing. Test it for leaks by screwing it on a bottle and pressurizing it, if there are any leaks, fill them with PL.

If you decide to go with the more robust way, buy your valve, drill the hole very close to the size of the valve, using some rubber from a bicycle inner tube, form an O ring, push the valve through the ring, and screw it into the cap.

Testing

Pressure test valve
Rocket
Air pump
Caution: Ruptures are violent and may harm you.

Fill the rocket completely with water, if you don�t do this, and the bottle �fails� it will create a massive explosion. Screw on pressure test valve. Pump to target pressure and hold that pressure for 2 minutes or twice as much time as expected to be held for. Next, depressurize. Pump again to 30 more PSI than target pressure. Repeat. If the pressure vessel passes the test then it can be launched, if it fails, than be glad it wasn�t on the pad filled mostly with air. Usually, unaltered bottles can be pressurized to 140 PSI no problem, and I have found that on some brands, I can simply not get it to fail, but it is better to be safe than sorry.

Welcome to Rocketss. The site is divided into two main sections, the Water Rockets section and the Pyro Rockets section.
In each section you will find tutorials, links, and and a project registry. Because this site is always being updated with the latest information, please check back.