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It's not very scientifical, but for candy fuel engines I built when I was younger, I used simple formula to compute area of the nozzle (An) from area of engine (internal diameter) (Ae): An = Ae / K or for radiuses: Rn = sqrt(Re^2 / K) or for diameters: Dn = 2 * sqrt((De/2)^2 / K) for candy fuels, K of around 100 worked for me. So for example if you have ...

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