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- Path: sparky!uunet!gatech!usenet.ins.cwru.edu!agate!soda.berkeley.edu!gwh
- From: gwh@soda.berkeley.edu (George William Herbert)
- Newsgroups: sci.space
- Subject: Re: Aluminum as Rocket Fuel?
- Date: 3 Jan 1993 07:31:44 GMT
- Organization: Retro Aerospace, 2240 Blake #101, Berkeley CA 94704
- Lines: 31
- Sender: George William Herbert (gwh@soda.berkeley.edu)
- Message-ID: <1i64p0INNkca@agate.berkeley.edu>
- References: <19146@mindlink.bc.ca> <1i5nafINN96k@uwm.edu>
- NNTP-Posting-Host: soda.berkeley.edu
- Summary: Solid Al bad idea
-
- In article <1i5nafINN96k@uwm.edu> anthony@csd4.csd.uwm.edu (Anthony J Stieber) writes:
- >No one has mentioned using a cylinder of aluminum with perhaps a star
- >shaped core and spraying LOX down it. The aluminum is both the fuel
- >and structure. Running it until much before burn through is probably a
- >bad idea, but it may be cheaper than importing steel shells from earth.
-
- I'm posting this because Tony bothered me into catching up on sci.space
- by talking about this post for a while 8-)
-
- Solid aluminum burns just fine, but it has a really poor regression
- rate (it burns very very slowly). The best way to do this would be to
- bunlde aluminum wire in a combustion chamber to increase the surface
- area so that you get decent thrust.
-
- The primary problem of a steel combustion chamber is that combustion
- will be hot enough that LOX will definitely be burning with steel
- as well as aluminum. I don't know what I'd do, perhaps a ceramics
- lining.
-
- And, as much as you people hate to have reality dropped on a conversation,
- aluminum is the wrong fuel to use if it's an earth based application.
- A General Dynamics report on Hybrid replacements for the Space Shuttle SRBs
- indicates that Zinc is a better solid to burn; it's a whole lot more
- dense, a lot cheaper, and it's Isp is nearly the same (density Isp is
- a whole lot better). (NASA Contract NAS8-37777)
-
- -george william herbert
- Retro Aerospace
- 2240 Blake #101
- Berkeley CA 94704
-
-