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Groups > sci.physics > #688148
| From | Thomas Koenig <tkoenig@netcologne.de> |
|---|---|
| Newsgroups | rec.arts.sf.written, rec.arts.sf.science, sci.space.policy, sci.physics |
| Subject | Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) |
| Date | 2018-06-01 20:07 +0000 |
| Organization | news.netcologne.de |
| Message-ID | <pes925$6i6$1@newsreader5.netcologne.de> (permalink) |
| References | (2 earlier) <pegol2$uj8$1@dont-email.me> <t63ogdp69so3klmm0cpuc13k1gjq9lmrk6@4ax.com> <baiogdhtk5m4u385mlgdv530agvj8ce9tk@4ax.com> <vqtogdhisj5bl28visfpnhkoc2li07ggm0@4ax.com> <peldsf$haq$1@dont-email.me> |
Cross-posted to 4 groups.
Robert Clark <rgregoryclark@gmSPAMBLOCKail.com> schrieb: >=========================================================== > "J. Clarke" wrote in message > news:vqtogdhisj5bl28visfpnhkoc2li07ggm0@4ax.com... > > On Mon, 28 May 2018 11:30:57 -0700, Fred J. McCall ><fjmccall@gmail.com> wrote: > > ... >>>>Note that SpaceX has already acknowledged that the Falcon 9 first stage >>>>and >>>>the BFR stages will have SSTO capability, but with small payload. >>> >>>Source? And I don't mean some throwaway comment or some blog post by >>>somebody who doesn't work for SpaceX. >>> >> >>Well, he's not exactly an employee but Elon Musk has said that a >>Falcon 9 Full Thrust first stage reaches (a very low) orbit on an >>expendable launch and that they deliberately give it a little boost >>back toward the ground so that it doesn't hang around up there for a >>month or two. > > Source? Other than a tweet? Well, one could try plugging the available numbers into the rocket equation. I've taken them from http://www.spaceflight101.net/falcon-9-v11.html (accuracy is probably debatable, plus the numbers are old, so a grain of salt is advised). Average specific impulse (in seconds, yech) could be a bit more than 300 s, let's say v_e = 3000 m/s effective exhaust velocity. m_full = 418.8 tons. m_empty = 23.1 tons. v_max = v_e * ln(m_full/m_empty) = 8700 m/s. Probably not quite enough, and certainly not useful (I've left out any payload and the aerodynamic nose cone).
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Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) "Robert Clark" <rgregoryclark@gmSPAMBLOCKail.com> - 2018-05-30 01:46 -0400
Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) Thomas Koenig <tkoenig@netcologne.de> - 2018-06-01 20:07 +0000
Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-01 22:51 -0400
Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) Thomas Koenig <tkoenig@netcologne.de> - 2018-06-02 16:19 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) "Robert Clark" <rgregoryclark@gmSPAMBLOCKail.com> - 2018-06-03 04:17 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 04:38 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-03 01:58 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 05:10 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-03 14:06 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 17:59 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-03 16:12 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 19:54 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-04 00:41 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Dimensional Traveler <dtravel@sonic.net> - 2018-06-03 19:36 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-04 01:00 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Dimensional Traveler <dtravel@sonic.net> - 2018-06-04 07:32 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Steve Carroll <frelwizzen@gmail.com> - 2018-06-04 08:51 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Alan Baker <nunya@ness.biz> - 2018-06-04 09:13 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Steve Carroll <frelwizzen@gmail.com> - 2018-06-04 09:22 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-04 16:08 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-04 19:37 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Jeff Findley <jfindley@cinci.nospam.rr.com> - 2018-06-05 07:25 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-05 13:39 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Jeff Findley <jfindley@cinci.nospam.rr.com> - 2018-06-06 06:44 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-05 20:55 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-05 22:59 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Ninapenda Jibini <taustinca@gmail.com> - 2018-06-06 06:20 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Jeff Findley <jfindley@cinci.nospam.rr.com> - 2018-06-06 06:50 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-06 20:54 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-06 18:16 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Jeff Findley <jfindley@cinci.nospam.rr.com> - 2018-06-07 11:51 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Thomas Koenig <tkoenig@netcologne.de> - 2018-06-06 06:21 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-06 02:14 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Jeff Findley <jfindley@cinci.nospam.rr.com> - 2018-06-06 07:08 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Thomas Koenig <tkoenig@netcologne.de> - 2018-06-07 16:42 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-07 12:26 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) "Robert Clark" <rgregoryclark@gmSPAMBLOCKail.com> - 2018-06-10 20:16 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-10 20:13 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) scott@slp53.sl.home (Scott Lurndal) - 2018-06-04 15:40 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-04 16:11 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Thomas Koenig <tkoenig@netcologne.de> - 2018-06-03 10:29 +0000
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 09:25 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-03 14:21 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 18:19 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-03 16:15 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) J. Clarke <jclarke.873638@gmail.com> - 2018-06-03 19:55 -0400
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) Fred J. McCall <fjmccall@gmail.com> - 2018-06-04 00:44 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-06-05 14:58 -0700
Re: Once more into the breach: SSTO's (was Re: Life on Europa in scifi?) "hanson" <hanson@quick.net> - 2018-06-05 20:13 -0700
Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) "reber G=emc^2" <herbertglazier0@gmail.com> - 2018-06-05 14:59 -0700
Re: Once into the breach: SSTO's (was more Re: Life on Europa in scifi?) "hanson" <hanson@quick.net> - 2018-06-05 20:13 -0700
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