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Say I want to make a reverse hybrid rocket motor, that runs on a gaseous/liquid fuel which is passed by a solid oxidizer. Would KNO3 make a good oxidizer? Or does this concept not work with Liquid fuels?

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  • $\begingroup$ KNO3 makes a lousy oxidizer generally, producing moderate amounts of oxygen and a plenty of KNO2 which at the KNO3 decomposition temperature is a thick, sticky liquid gunking up any nozzless, sticking and solidifying into a thick crust in contact with everything not burning hot. It's a general nuisance. Consider KMnO4 maybe. $\endgroup$
    – SF.
    Jul 11 '17 at 11:58
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In theory this should work, You may run into problems regarding keeping the potassium nitrate solid as it may tend to fall apart. Finding a binder that would keep the potassium nitrate solid but not turn itself into a solid fuel may be a challenge. You could also maybe just compact the potassium nitrate onto itself to hold its shape. Either way it will be a challenge but again in theory this should work.

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