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- Newsgroups: sci.space
- Path: sparky!uunet!munnari.oz.au!spool.mu.edu!agate!rsoft!mindlink!a752
- From: Bruce_Dunn@mindlink.bc.ca (Bruce Dunn)
- Subject: Re: Aluminum as rocket fuel?
- Organization: MIND LINK! - British Columbia, Canada
- Date: Thu, 31 Dec 1992 20:09:09 GMT
- Message-ID: <19070@mindlink.bc.ca>
- Sender: news@deep.rsoft.bc.ca (Usenet)
- Lines: 26
-
- > Nick Janow writes:
- > 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.
-
-
- I think the fundamental problem with this is where to get the large
- amounts of power needed. Even moderate sized rocket engines use turbopumps
- generating several thousand kilowatts of power.
-
- Paul Deitz has pointed out in E-mail to me that molten aluminum would
- be an ideal candidate for pressure feeding. Relative to normal fuels such as
- hydrogen (density 70 kg/m^3) and RP-1 (density 800 kg/m^3), aluminum with a
- density of about 2700 kg/m^3 will require small tanks. The tanks are very
- hot, meaning that little mass of pressurization gas will be needed. A useful
- technique might be to have the molten aluminum stored in a spherical steel
- tank pressurized by injecting liquid nitrogen into the tank (which because of
- the heat will immediately vaporize). Is nitrogen available from the moon?
-
-
-
- --
- Bruce Dunn Vancouver, Canada Bruce_Dunn@mindlink.bc.ca
-