Water Rocket (Bottle Rocket) Adapter

thingiverse

This fun little thing allows you to attach a standard 1/4 NPT air hose quick disconnect to a 2 Liter Bottle. This allows one to print out a very easy way to pressurize and launch soda (or pop) bottles of various sizes. Based on my research they have a standardized cap size, except for water bottles which seem non-standard. (The pictured bottle is obviously not a 2 L, but the threads are identical) The quick disconnect becomes your nozzle, an easy way to apply gas and also a simple way to release the rocket for launch. Apparently there is more than one definition for "Bottle Rocket", perhaps a more accurate term is "Water Rocket". The following link does not work properly because it includes a parenthesis, copy the entire line into your browser address bar:http://en.wikipedia.org/wiki/Bottle_rocket_(model) I intend to test out various launch mechanisms and post the information at to how best to make one out of readily available materials. I also intend to create a derivative that has fins and/or can accept fins. Instructions First thing's first, this thing is for informational purposes only. Any maker that chooses to build it and use it for anything other than a paperweight assumes full responsibility for their actions and any death dismemberment or broken windows that result. Furthermore, this should never ever be used without adult supervision so for all of you young makers out there, don't blow yourselves up unless there is an adult around to blame. If you fail to use it as a paperweight, DO NOT pressurize it over 120 PSI The quick disconnect I used is this item:http://www.homedepot.com/h_d1/N-5yc1v/R-100053927/h_d2/ProductDisplay?langId=-1&storeId=10051&catalogId=10053 But you can certainly find the same part online or at your local hardware store. The hole for it to thread into is 0.54" diameter with a thread pitch of 0.05556" (18 threads per inch) After printing, apply teflon tape to both the bottle threads and the 1/4" NPT quick disconnect before screwing into the adapter. I screwed it together cold, it might work better to screw it together hot. I designed this to print the threads so that the resultant part would be ready to use without further machining, the threads on the disconnect side are very tight and I had to use a wrench to force it in (again, it was cold)