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- Path: sparky!uunet!cis.ohio-state.edu!ucbvax!mtxinu!taniwha!paul
- From: paul@taniwha.UUCP (Paul Campbell)
- Newsgroups: sci.space
- Subject: Re: Aluminum as Rocket Fuel?
- Message-ID: <1370@taniwha.UUCP>
- Date: 31 Dec 92 17:49:14 GMT
- References: <C01vE9.HsF.1@cs.cmu.edu> <1hsfvsINN115@nuala.hal.COM>
- Distribution: sci
- Organization: Taniwha Systems Design
- Lines: 38
-
- In article <1hsfvsINN115@nuala.hal.COM> juan@nuala.hal.COM (John Thompson Reynolds) writes:
- >
- >In article <C01vE9.HsF.1@cs.cmu.edu>, 0004244402@mcimail.com (Karl Dishaw) writes:
-
- >My thoughts were along the line of constructing a hollow cylinder of
- >powdered aluminum, into which you would pump LOX at a controlled rate.
-
- >I seem to remember a somewhat similar design which pumps LOX into a tube of
- >rubber? To stop the "engine", stop the flow of LOX.
-
- >Obviously such a design would only be useful in a vacuum, and is probably
- >no more reusable than an SRB.
-
- Well, existing AP/rubber motors (like the SRBs) have the oxidizer embedded in
- the rubber (the AP) - they also tend to include some aluminium because it
- gives better thrust (the mix is critical because you want to control burn time,
- keep chamber temps and pressures in a safe range etc etc - having seen the
- results of NOT keeping the chamber pressure in safe range ....BANG).
-
- A LOX/Rubber system would probably have Al embedded in the rubber anyway for
- the same reasons. I'm a bit leary about it being restartable, certainly you
- can shut it off, but after burning for a while the mechanical stabiliy of
- the rubber is going to be a bit off - garbage may have blocked the nozzle
- etc etc.
-
- I doubt an Al engine will be reusable without lots of cleaning --- alumina's
- going to be real hard to get off!! (Probably harder to clean than an SRB)
- Why wouldn't it work in an atmosphere?
-
- Paul
-
-
-
- --
- Paul Campbell UUCP: ..!mtxinu!taniwha!paul AppleLink: CAMPBELL.P
- "Finally after much thought he tied a dollar bill to the top of the tree, it
- seemed to fit - after all it was the premier capitalist holiday, besides after
- the 'fall' of communism a star didn't seem appropriate anymore ..."
-