This is my fourth iteration of building an economical bottle rocket launcher to use in TUSD Science Classes. Thanks to the new NGSS standards, I have a feeling teachers will be able to find even more time dedicated to the engineering of 2-liter bottle rockets while exploring physics, pressures and atmospheric processes. To build this launcher from scratch will cost about $. If you're like me, you just might have enough scrap lying around the yard to build it with that.
How to Build The Hollister Launchmeister.