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Hydrogen peroxide is not readily available in any significant quantity or purity for the amateur rocket community. Follow the same techniques you find in kits of rockets using the same motors you plan to use in your designs. Amateur rocketry groups exist, but there are no national organizations which offer insurance and support amateur launches. What you need to know What kind of propellant are you going to make? Furthermore, if the rocket engine gimbals, it is necessary to have flexible fuel and oxidizer lines. Frankly, LH2 is probably too difficult to handle for the amateur rocket community.

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