Talk:Spaceflight

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*Added archive https://web.archive.org/web/20080108073958/http://findarticles.com/p/articles/mi_qn4158/is_20030407/ai_n12692130 to http://findarticles.com/p/articles/mi_qn4158/is_20030407/ai_n12692130
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thread_title:  External links modified 

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thread_title:  External links modified 

message: Per the discussion at Wikipedia talk:WikiProject Spaceflight#Questionable article, a lot of the material at Spacefaring duplicates Spaceflight, so should be merged here. Thoughts? — Sasuke Sarutobi (talk)
*Support as the suggestor.  :-)  -PopSci (talk) 19:17, 1 May 2018 (UTC)
replies: text: The merge can take place, which does not stop such list to be created. Rowan Forest (talk) 18:41, 20 August 2019 (UTC)

text: Klbrain (talk) 06:23, 30 August 2019 (UTC)
thread_title:  Merge (2018) [[Spacefaring]] 

message: This text is not supported by any citation, and in fact is wrong:
This is nonsense, which was first added by an electrical engineer (not an expert in spaceflight). The amount of energy required for an "escape" mission is not determined by perigee, but by apogee of the "escape" orbit. (Another common misconception is that a lunar mission requires Earth escape velocity. It does not; it only requires a very high apogee which takes the craft toward the Moon.) A trajectory sufficient for translunar or interplanetary flight should not "care" whether a parking orbit is first reached. In other words, the delta v required for the Saturn V third stage to perform a direct Apollo translunar injection should be essentially equal to the delta v into orbit, plus the delta v required for the injection from orbit (possibly subject to the Oberth effect). It has nothing to do with "perigee"; obviously the perigee of the injection orbit equals the perigee of the parking orbit; "an arbitrarily low perigee that will never be reached" is essentially meaningless. And this was not why the Apollo program chose to use the parking orbit; that was for greater control of the launch window.
I know of no reliable source documentation that says direct injection was ever considered for Apollo. What they considered was direct ascent, which is completely different and has nothing to do with translunar injection. That required a much larger rocket, because of considerations at the lunar landing side, not Earth departure. And that effect was much larger than any possible difference due to the Oberth effect at Earth departure.
The reason the Apollo 15, 16 and 17 parking orbits were especially low was that the capabilities of the Saturn V were being stretched so these missions could carry a larger payload to the Moon than the prior missions did. JustinTime55 (talk) 14:20, 6 June 2018 (UTC)
thread_title:  Leaving orbit: original research 

message: There is an article listed at 'Articles for Deletion' (AfD) that may interest you. The article is International Committee Against Mars Sample Return. Please comment at Wikipedia:Articles for deletion/International Committee Against Mars Sample Return. 
Cheers, Rowan Forest (talk) 15:42, 22 August 2018 (UTC)
thread_title:  Article for deletion: International Committee Against Mars Sample Return 

message: The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 17:14, 30 October 2020 (UTC)
thread_title:  A Commons file used on this page or its Wikidata item has been nominated for deletion 

message: The following Wikimedia Commons file used on this page or its Wikidata item has been nominated for deletion:
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Participate in the deletion discussion at the nomination page. —Community Tech bot (talk) 10:08, 30 June 2021 (UTC)
thread_title:  A Commons file used on this page or its Wikidata item has been nominated for deletion 

message: if you want to do this write wright right or rite... https://imgur.com/gallery/Q4H0Z  — Preceding unsigned comment added by 198.136.32.55 (talk) 20:51, 13 April 2022 (UTC)
thread_title:  look... 

message: IMHO this is correct : A launch complex consists of a launch pad, launch tower and flame trench. Also see Kennedy_Space_Center_Launch_Complex_39A. OpenStreetMap definition : https://wiki.openstreetmap.org/wiki/Key:aeroway#Spaceflight Dulliman (talk) 11:34, 20 January 2023 (UTC)
thread_title:  "A launch pad is a fixed structure designed to dispatch airborne vehicles. It generally consists of a launch tower and flame trench"