Hybrid motors

mbecks said:

I know where not aloud to discuss technique of building rocket motors so let's not do that.

Has anyone here tried to build their own hybrid motor? Has anyone here bought liquid oxygen? I know praxair sells it but is it hard to get?

If your here just to post "don't do it you pshyco" please save your breath. I would t do anything g like this with out the proper knowledge, safety, and licenses.

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Dave A said:

I tried to design and build a 98mm Hybrid like Contrail but it's a lot of work.
It's easier to just buy the 75mm M motror, the fill system is simpler and only uses Nitrous, probably the simplest M system out there.
They have a nice K system if you want smaller.

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mbecks said:

I never thought of using nitrous that's a very good and interesting idea. Any chance you could link me to where I could buy the kits your talking about?

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mbecks said:

I never thought of using nitrous that's a very good and interesting idea. Any chance you could link me to where I could buy the kits your talking about?

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• It is hard (not to mention dangerous) to handle.
• It is not self-pressurizing.
• I don't think folks in the professional arena are going to sell you less that 80L at a crack. That is a big honking dewar flask.

Dave A said:

Doug Pratt definitely has the best GSE or ground support equipment I have seen.

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mbecks said:

I never thought of using nitrous that's a very good and interesting idea. Any chance you could link me to where I could buy the kits your talking about?

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Charles_McG said:

How can LOX not be self pressurizing? I have a hard time imagining that a small hybrid system would be -that- adiabatic.

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H_Rocket said:

To be honest, it is something that I read in my early foray into hybrids. Never bothered to run with it as I have experience with LOX on a professional level and have way too much respect for it to muck around at a hobby level.

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Charles_McG said:

I work in petrochem research, where the mere mention of O2 sets people in a tizzy. So I respect your respect. It seems like about once a decade, someone around here blows up a vacuum system by accidentally condensing 'mere' air in a cryo-trap.

But I would think that a liquified gas would be the epitome of self-pressurizing. Give or take heat transfer. And a small system would have a lot of surface area compared to volume.

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