For over a decade profmason.com was a repository of over 200 electronics and robotics projects that I completed between 2004-2014. In 2016, my web provider disappeared along with all access to the website. After spending 2 years and 9 months trying to get the domain back from the Panamanian domain squatter who had bulk purchased my domain when it came up at the registry, I have decided to start a new blog to document my projects new and old.
A single use rocket nozzle can be made using Water Putty and a graphite plate in a 2" PVC Pipe fitting. Durhams water putty is a gypsum based putty that exhibits very little shrinkage while drying and is effective as a single use nozzle for motors up to 4" in diameter. Supplies: 2" PVC Coupling 2" PVC to 3/4" threaded female reducer Water putty 1/4" thick graphite plate ~1"x 1" ( 3/8" ID fender washer can be substituted, but it adds additional complexity) Screwdriver or chopstick for mixing 2 spoons duct tape mixing cup Safety glasses nitrile gloves or equivalent Wear safety glasses and nitrile gloves Use PVC primer to coat the surface of the reducer and the PVC coupling up to the ridge joint. Use PVC glue to coat the surfaces and then press the PVC reducer into the coupling. Hold for at least 20 seconds so that the reducer doesn't float out of the coupling. Cover the small hole in the bottom with duct tape to retain the putty, it i...
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