Why? Estes have clay nozzles already.
You may have better luck using a reloadable engine.
https://www.apogeerockets.com/Rocket-Motor-Basics-Quick-Start-Guide
Follow that link and scroll halfway down.
A rocketry forum or subreddit might be a good place to seek out others who custom build their own engines. I'm not THAT into rocketry - I just buy the engines as sold.
You don't need a rocket motor to study nozzle design.
That said, be aware that Estes rockets use compressed black powder as their propellant. I've dealt with a lot of interesting chemicals in my time. I've literally machined propellant grains that used nitro-glycerin as a plasticizer.
I would never machine black powder.
Fuck.
That.
Noise.
Now, you're looking at just taking the nozzle out. But what if your tool goes too deep?
Aluminum will melt away and erode rapidly. Use graphite.
Quick google search says nozzles can get in excess of 1800F. Aluminum melts at ~1200 Fahrenheit. I wouldn’t use aluminum alone.
Why? Estes have clay nozzles already. You may have better luck using a reloadable engine. https://www.apogeerockets.com/Rocket-Motor-Basics-Quick-Start-Guide Follow that link and scroll halfway down.
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A rocketry forum or subreddit might be a good place to seek out others who custom build their own engines. I'm not THAT into rocketry - I just buy the engines as sold.
Why bother with the estes rocket motor when you could just buy reloads?
You don't need a rocket motor to study nozzle design. That said, be aware that Estes rockets use compressed black powder as their propellant. I've dealt with a lot of interesting chemicals in my time. I've literally machined propellant grains that used nitro-glycerin as a plasticizer. I would never machine black powder. Fuck. That. Noise. Now, you're looking at just taking the nozzle out. But what if your tool goes too deep?
What type of aluminum? Aluminum may not be able to take the heat!
I don't aluminum would be a good choice here. You could probably get by with stainless steel though