Building this launcher is simple if you already have a mill. It does a remarkable job of pressurizing and launching soda bottles which are partially filled with water. The main component of this is a triple-gasket stopper with a quick release.
The problem with a lot of these water bottle rocket projects is that they leak where the bottle meets the launcher. In most cases this is a good thing as it’s almost impossible to build up enough pressure to cause the bottle to fail. This system has no such built-in safety mechanism, which is why the test launch below is conducted from a safe distance. After seating the partially filled bottle on the launch platform it’s pressurized to around 100 PSI at which point a yank on the string lets it fly.
Most of the time we look on these as casual projects. But we figure this one is much more suited for a rocket club or hackerspace event.
Continue reading “Milled water bottle rocket launcher pushes plastic containers to their limit”
[Ed] got pretty creative with a hack that adds a pressurized water tap to his Jeep Wrangler. The tap on the rear passenger bumper now lets him hose off the vehicle after mudding, rinse his SCUBA gear after a dive, and just generally comes in handy.
If you want running water you’ve got to have a place to put it. This is actually what sparked the idea for the project. [Ed] noticed that the bumper was hollow and had some drain holes on the bottom. After plugging those and adding a fill hole to the top he found that he had a reservoir for about seven gallons. To get the water out he added a pump deigned to be used on an RV. It’s got features that make it work perfectly for this application: it runs off of battery voltage, it will turn on and off automatically when the tap is opened based on water pressure, and it will shut itself off if the reservoir runs dry. He designed a bezel to give the spigot a professional look. Just out of frame in the image above is an attachment for pressurized air. His next planned project for the Jeep is to add an air compressor.
After the break you can see a demo of the installed system, as well as a water pump test.
Continue reading “Jeep Wrangler gets pressurized water right out of the bumper”
School will be starting again in a few weeks but it’s not too late to enjoy a little time with your kids. This water rocket launcher lets you do just that. Built using the frame from an old grill, a soda bottle takes its place on the upturned PVC pipe. There’s a connection for your garden hose that allows you to inject water into the bottle. From there, a compressor connection pressurizes the bottle in preparation for launch. Watch it happen in the video after the break. That bottle could use some fins and a nose cone but there’s no denying the delight the kids are enjoying when they chase after the downed craft.
If you’ve already got a compressor and some empty 2-liter bottles you might also pick up some extra PVC to make this pressurized water cannon.