Guidance on making a model rocket engine? Answered

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First, I've seen both potassium nitrate and ammonium nitrate being used in rocket fuel. What are the differences?

Second, how much temperature does a rocket nozzle need to withstand? Would JB Weld work for the nozzle?

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Rocket nozzles are used once and made out of kitty litter impact hammer pressed between two steel shaped forms.

Still looking for the pointer for you.

Look to the right hand side - several projects to do this. >>>>>>>>>>>

Your dealing with some pretty dangerous stuff,

Ceramic or clay is what is used for a nozzle. Look at the business end of common fireworks. Epoxy burns. Try it, put a torch to it and see what happens.

Ok. Thanks for the blow torch suggestion. That's a good way to proof test things.