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- Newsgroups: sci.space
- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!rsoft!mindlink!a684
- From: Nick_Janow@mindlink.bc.ca (Nick Janow)
- Subject: Re: Aluminum as rocket fuel?
- Organization: MIND LINK! - British Columbia, Canada
- Date: Thu, 31 Dec 1992 07:38:24 GMT
- Message-ID: <19059@mindlink.bc.ca>
- Sender: news@deep.rsoft.bc.ca (Usenet)
- Lines: 32
-
- Bruce_Dunn@mindlink.bc.ca (Bruce Dunn) writes:
-
- > Using molten aluminum will give a higher Isp than aluminum metal. Major
- > problems will be pumping, and how to keep the aluminum from freezing in
- > pipes and injectors when the motor is shut off.
-
- Pumping is simple, since aluminum is highly conductive. Just use
- electromagnetic fields to thrust it through a pipe. There's no moving parts
- to worry about. I think this is being used in sodium reactor research, so it
- isn't an untested technology.
-
- Keeping the aluminum molten should be easy too...for a rocket that only
- operates in a vacuum. Since the main reason to use aluminum/oxygen is that
- it is easily available from the moon, that's not a bad limitation.
-
- Pipes and tanks could be polished on the outside to reduce radiation loss,
- and structural supports could be made of insulating materials, and heated if
- necessary. If the tanks and pipes were non-conductive (perhaps fibre
- reinforced ceramics, inductive heating could heat the aluminum directly.
- Actually, there's not need to get fancy: inductively heat the pipe and tank
- walls, and heat the aluminum by conduction. Of course, simple resistance
- heating might be simpler and more efficient.
-
- It sounds like a great design for a lunar "space truck", for a future lunar
- colony. :)
-
-
- Now, what about the nozzle problems....
-
- --
-
- Nick_Janow@mindlink.bc.ca
-