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Groups > sci.physics.relativity > #359592
| From | Thomas Heger <ttt_heg@web.de> |
|---|---|
| Newsgroups | sci.physics.relativity |
| Subject | Re: Imagine the first landing strip on the moon |
| Date | 2015-08-04 04:32 +0200 |
| Message-ID | <d2amihFtn7U1@mid.individual.net> (permalink) |
| References | (7 earlier) <d2019vFaq6aU1@mid.individual.net> <d20ivbFekvnU1@mid.individual.net> <oe7mraloor7kt3h236r7skupbhckc0iibb@4ax.com> <mplif0$2ao$1@speranza.aioe.org> <4fmsratt5k1df8ksfp6httil17qqon1c9r@4ax.com> |
Am 02.08.2015 20:40, schrieb kefischer: > On Sun, 2 Aug 2015 17:02:24 +0000 (UTC), wobbly<wobbly@dont-email.me> > wrote: > >> kefischer wrote: >> >>> In 1969, it might have had to be done >>> manually, with the pilot watching to avoid craters or slopes, no >>> electronics can do that, and the electronics then was not capable of all >>> the inputs necessary. >> >> A human pilot is an adaptive filter. A slow one. Without electronics >> (which are fast) flights are not possible nowadays. > > That's what Ben Rich claimed about his baby, > but heck, anything with enough thrust and enough > control surface _will_ fly, and can be flown by man; To slow down a lander from orbital velocity to zero velocity, while simultaneously land at a certain spot, that is fantastically difficult. The pace was possibly about 5000 km/h in some kind of orbit at maybe 50 km above ground. The spaceship would circle around the Moon forever, if it is not slowed down. Now you need to aim the engine into the right direction and fire it, to make the craft slow down. Since you have no air to guide the lander, the direction of the lander needs to be manipulated into the right direction by pulses from additional engines or by directing the main engine. Any miscalculation would cause a rotation. That is something, you definitely don't like, since the main engine should point into the direction you are flying to. So, without prevention of such rotation you could not land. To achieve this precision of flight is certainly a challenging task. TH
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Re: Imagine the first landing strip on the moon wobbly <wobbly@dont-email.me> - 2015-07-28 22:20 +0000
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-07-29 03:14 +0200
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-07-30 22:38 +0200
Re: Imagine the first landing strip on the moon wobbly <wobbly@dont-email.me> - 2015-08-02 17:02 +0000
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-02 14:40 -0400
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-04 04:32 +0200
Re: Imagine the first landing strip on the moon John Gogo <jfgogo22@yahoo.com> - 2015-08-03 19:56 -0700
Re: Imagine the first landing strip on the moon John Gogo <jfgogo22@yahoo.com> - 2015-08-03 19:58 -0700
Re: Imagine the first landing strip on the moon Bohuš Matuška <bohu@paranetnet.net> - 2015-08-04 15:14 +0000
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-05 06:54 +0200
Re: Imagine the first landing strip on the moon Bohuš Matuška <bohu@paranetnet.net> - 2015-08-05 13:35 +0000
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-06 06:42 +0200
Re: Imagine the first landing strip on the moon John Gogo <jfgogo22@yahoo.com> - 2015-08-05 22:24 -0700
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-07 08:09 +0200
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-07 02:41 -0400
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-07 10:05 +0200
Re: Imagine the first landing strip on the moon Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-07 10:29 +0200
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-07 06:21 -0400
Re: Imagine the first landing strip on the moon Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-07 13:42 +0200
Re: Imagine the first landing strip on the moon Emmerich Schultheiß <emme@noemail.thx> - 2015-08-07 13:01 +0000
Re: Imagine the first landing strip on the moon Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-07 16:00 +0200
Re: Imagine the first landing strip on the moon Emmerich Schultheiß <emme@noemail.thx> - 2015-08-07 14:11 +0000
Re: Imagine the first landing strip on the moon Thomas Heger <ttt_heg@web.de> - 2015-08-07 18:26 +0200
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-07 11:20 -0400
Re: Imagine the first landing strip on the moon Poutnik <Poutnik4NNTP@gmail.com> - 2015-08-07 18:07 +0200
Re: Imagine the first landing strip on the moon Emmerich Schultheiß <emme@noemail.thx> - 2015-08-07 17:18 +0000
Re: Imagine the first landing strip on the moon pnalsing@gmail.com - 2015-08-07 10:41 -0700
Re: Imagine the first landing strip on the moon Emmerich Schultheiß <emme@noemail.thx> - 2015-08-07 17:49 +0000
Re: Imagine the first landing strip on the moon pnalsing@gmail.com - 2015-08-07 11:15 -0700
Re: Imagine the first landing strip on the moon Emmerich Schultheiß <emme@noemail.thx> - 2015-08-07 18:26 +0000
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-07 14:31 -0400
Re: Imagine the first landing strip on the moon pnalsing@gmail.com - 2015-08-07 11:46 -0700
Re: Imagine the first landing strip on the moon kefischer <emoneyjoe@iglou.com> - 2015-08-07 15:58 -0400
Re: Imagine the first landing strip on the moon pnalsing@gmail.com - 2015-08-07 19:43 -0700
Re: Imagine the first landing strip on the moon John Gogo <jfgogo22@yahoo.com> - 2015-08-07 20:47 -0700
Re: Imagine the first landing strip on the moon John Gogo <jfgogo22@yahoo.com> - 2015-08-07 18:49 -0700
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