Subject: Space-tech digest #142 Contents: Ozone rocket Isp (1 msg) Nitric acid pricing (1 msg) NASA Langley Techreports via anon FTP (1 msg) ------------------------------------------------------------ Date: 13 Jan 1993 21:55:59 -0500 (EST) From: "GORDON D. PUSCH" Subject: Ozone rocket Isp To: space-tech@cs.cmu.edu I just found that _Analog_ Article on ozone rockets; it is: "The Ozone Rocket" Stephen L. Gillet _Analog_ pp.46--53, (Aug 1985) He quotes: Isp(H2/O2) = 391 sec Isp(H2/F2) = 410 sec Isp(H2/O3) = 424 sec Thus, H2/O3 gives about 8.4% higher Isp than H2/O2, and about 3.4% higher Isp than H2/F2. You may recall that my proposal was to stabilize frozen O3 by slurrying it in liquid N2; I imagine the N2 will cut into the Isp somewhat, but I can't estimate how much, since I don't know what fraction LN2 would be needed to slush the O3 ... :-( I suppose a crude bound on whether this might be practical could be obtained by simply scaling the above Isp by the appropriate mean-molecular-weight factor (while completely ignoring dissociation effects) if the N2-fraction which degrades the Isp to that of H2/O2 is ridiculously small then the idea probably won't work... Gordon D. Pusch ------------------------------ From: gwh@lurnix.COM (George William Herbert) Date: Fri, 15 Jan 93 15:58:23 -0800 Sender: gwh@lurnix.COM To: space-tech@cs.cmu.edu Cc: gwh@lurnix.COM Subject: Nitric Acid pricing Self_Organization: Retro Aerospace, (510) 849-4853, gwh@retro.com Work_Organization: Lurnix, (510) 849-4478 x229 fax (510) 849-0409 I have a firm price on 98% HNO3 (nitric acid) at $265-275/ton for multi-ton lots (Freight Equalized from Arkansas). [english units] This works out to about twelve cents per kilogram. They said they could do better (-10%) if I ordered more than a couple of hundred tons. Any large, real big dumb booster would use a lot more than a couple of hundred tons, so $265 per metric ton is a good working number for booster propellant costs. Negotiation and very large purchases might lower that further. One might conclude that Nitric Acid as an oxidizer will be a very inexpensive propellant. 8-) Good news. I will be ordering 75 pounds HNO3, aluminum and zinc for fuels, a tad of Hydroflouric Acid (Inhibited HNO3 ingredient in ~1% conc.) and testing aparatus in the next 2 wks to month, to do initial propellant characteristics and handling testing. Initial timetable calls for finishing initial propellant tests by mid-July, followed as soon as possible by performance testing and initial vehicle design for a light vehicle. Current cost estimate on the 20-kg payload demonstrator vehicle is down a bit due to lower HNO3 price than expected; the best estimate is $40,000 plus donated labor. Presuming the motor concept is safe, of course. Which is why the initial testing... More updates as they happen. -george william herbert Retro Aerospace "A Force in a Different Direction" ------------------------------ Date: Thu, 21 Jan 93 04:14:39 EST From: Mark.Maimone@A.GP.CS.CMU.EDU To: space-tech@CS.CMU.EDU Subject: NASA Langley Techreports via anon FTP Hi all, Forwarded info: Date: Tue, 19 Jan 93 09:29:04 -0500 From: Michael L Nelson Subject: NASA Langley Techreports via anon FTP NASA Langley Technical Report FTP Site Disclaimer: ----------- As an experimental project for electronic report distribution, this service should complement not replace conventional methods for report distribution. The electronic reports are missing some, none, or all of their illustrations because the electronic files for these illustrations are not available. However, figure legends are present even when the illustrations are not. If you find a discrepancy between the electronic report and the printed report, assume that the printed document is the version intended by the author(s). What Is Available: ------------------ The pub/techreports/larc/92 directory contains PostScript files of reference publications, technical memorandums, technical papers, and technical translations produced at NASA Langley during 1992. The files are named by report type and number; e.g., file tm4382 contains Technical Memorandum 4382. The directory also contains an ASCII file called abstracts.92. This file lists the abstracts of the reports available in this directory. New reports will be added to the directory and the abstract list as they become available. The file transfer program (FTP) lets you copy the abstracts.92 file or any of the PostScript report files to your local machine. During the FTP session, use the "get" command to copy the files into your directory. When the session is completed, use the "uncompress" command to restore the PostScript files. Then, use your system print command to print the files. 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If more than one person has that last name, the following address display appears: %finger owens@larc.nasa.gov [larc.nasa.gov] Tel Num M/S Name Bldg Room E-mail address 47241 440 OWENS, BENJAMIN S 1209 190 41130 355 OWENS, DONALD B 643 104 D.B.OWENS@LaRC.NASA.GOV 45899 423 OWENS, PATRICIA H 1250 162 865-0800 142 OWENS, PHYLLIS A 45833 483 OWENS, THOMAS L 1250T 405 42387 185 OWENS, WILLIAM J 1194 302 W.J.OWENS@LaRC.NASA.GOV If only one person has that last name or if the person's full name is specified, the following address display appears: %finger "owens, william j"@larc.nasa.gov [larc.nasa.gov] OWENS, WILLIAM J W.J.OWENS@LaRC.NASA.GOV Mail Stop 185 Reference Services Section 2 West Durand Street Research Information & Applications Div NASA Langley Research Center Building 1194, Room 302 Hampton, VA 23681 Phone +1 804 864-2387 For more information about the UNIX "finger" utility, type "man finger" at the command prompt. ---- Michael L. Nelson NASA Langley Research Center M.L.Nelson@LaRC.NASA.GOV (804) 864-8511 ---- UNIX is a trademark of AT&T Bell Laboratories. PostScript is a trademark of Adobe Systems, Inc. ------------------------------ End of Space-tech Digest #142 *******************