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Hi all, I built a small hybrid rocket engine and I would like to control the arrival of oxygen in the engine with an arduino card. What do you advise me: a solenoid valve? A valve with a servo motor? If possible, could you specify a model? It's been a while that I'm looking for without finding...

Hi all, I am looking to design and build a hybrid rocket engine and I would like to know where I could find a spreadsheet to design a hybrid rocket engine. Or if any of you could share it with me. Thank you so much !