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The result of the move request was: Moved. ( closed by non-admin page mover) SITH (talk) 14:40, 7 June 2019 (UTC)
Space Shuttle main engine →
RS-25 – The designation of "Space Shuttle Main Engine" has shifted from being the title of this engine to a descriptor, and it's a misleading one at that. With the
SLS now using these engines, along with NASA's shift to using the RS-25 name, I think keeping the old SSME name is doing more harm than good. We don't call the
F-1 the Saturn V main engine after all. It's much more concise to say, "the space shuttle used three RS-25s as its main engines," than it is to say, "the SLS will use four Space Shuttle Main Engines." One's a proper rocket engine name, the other's an application of said rocket engine.
Basically, calling this rocket by it's technical designation is far more concise, consistent, and precise than calling it by its former use. While the latter was justifiable when the one and only application of the RS-25 was as part of the space shuttle system, it no longer makes sense to use that designator as the engine's primary name. Anyone searching for "space shuttle main engine" on wikipedia will understand immediately why they were redirected to an article named "Rocketdyne RS-25," but someone unfamiliar with their use in the shuttle program might be confused why their query for "RS-25" redirects them to "space shuttle main engine." - Jadebenn ( talk) 08:15, 31 May 2019 (UTC)
This section has severely out-of-date info and could probably use some love. - Jadebenn ( talk) 08:39, 9 June 2019 (UTC)
I couldn't see how many STS launches they were designed to do between overhauls (3 I think) or how many launches in total they were designed or intended for. Which parts had to be specially designed so that the engine was reusable ? How much did the design for reuse, increase the development cost and the cost per engine ? - Rod57 ( talk) 12:08, 12 February 2020 (UTC)
Section 1.4.1 (Controller - Main Valves) mentions that the Chamber Coolant Valve (CCV) is 100% open at high throttle settings, "for maximum cooling," and is progressively closed at low throttle setting "for reduced cooling". This seems to contradict the schematic diagram of the engine in this same article (which is derived from various sources). The CCV appears to function as a bypass valve, bypassing the coolant plumbing and going straight to the preburners. Therefore, it appears (to this layman) that closing the CCV would actually increase the fuel flow through the nozzle and chamber cooling sections, as less fuel is able to bypass and would be then increasingly forced through the two sections of plumbing that provide cooling. If this is the case, my guess is that at lower thrust levels, the mass flow through the engine is less and therefore the regenerative cooling is reduced, so the CCV is closed to pick up the slack. Indeed, the source referenced at the end of section 1.4.1, reference 5, doesn't mention anything about "maximum cooling" or "reduced cooling," and simply states the valve positions for various throttle levels, which makes me think that these statements in the article are incorrect. Of course, I could be entirely wrong about this - perhaps someone more knowledgeable than me can elaborate. — Preceding unsigned comment added by 67.83.150.17 ( talk) 17:09, 24 November 2021 (UTC)
This is the
talk page for discussing improvements to the
RS-25 article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
Archives: 1, 2 |
![]() | RS-25 has been listed as one of the Engineering and technology good articles under the good article criteria. If you can improve it further, please do so. If it no longer meets these criteria, you can reassess it. | ||||||||||||
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Current status: Good article |
![]() | This article is rated GA-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||||||||||||
|
The result of the move request was: Moved. ( closed by non-admin page mover) SITH (talk) 14:40, 7 June 2019 (UTC)
Space Shuttle main engine →
RS-25 – The designation of "Space Shuttle Main Engine" has shifted from being the title of this engine to a descriptor, and it's a misleading one at that. With the
SLS now using these engines, along with NASA's shift to using the RS-25 name, I think keeping the old SSME name is doing more harm than good. We don't call the
F-1 the Saturn V main engine after all. It's much more concise to say, "the space shuttle used three RS-25s as its main engines," than it is to say, "the SLS will use four Space Shuttle Main Engines." One's a proper rocket engine name, the other's an application of said rocket engine.
Basically, calling this rocket by it's technical designation is far more concise, consistent, and precise than calling it by its former use. While the latter was justifiable when the one and only application of the RS-25 was as part of the space shuttle system, it no longer makes sense to use that designator as the engine's primary name. Anyone searching for "space shuttle main engine" on wikipedia will understand immediately why they were redirected to an article named "Rocketdyne RS-25," but someone unfamiliar with their use in the shuttle program might be confused why their query for "RS-25" redirects them to "space shuttle main engine." - Jadebenn ( talk) 08:15, 31 May 2019 (UTC)
This section has severely out-of-date info and could probably use some love. - Jadebenn ( talk) 08:39, 9 June 2019 (UTC)
I couldn't see how many STS launches they were designed to do between overhauls (3 I think) or how many launches in total they were designed or intended for. Which parts had to be specially designed so that the engine was reusable ? How much did the design for reuse, increase the development cost and the cost per engine ? - Rod57 ( talk) 12:08, 12 February 2020 (UTC)
Section 1.4.1 (Controller - Main Valves) mentions that the Chamber Coolant Valve (CCV) is 100% open at high throttle settings, "for maximum cooling," and is progressively closed at low throttle setting "for reduced cooling". This seems to contradict the schematic diagram of the engine in this same article (which is derived from various sources). The CCV appears to function as a bypass valve, bypassing the coolant plumbing and going straight to the preburners. Therefore, it appears (to this layman) that closing the CCV would actually increase the fuel flow through the nozzle and chamber cooling sections, as less fuel is able to bypass and would be then increasingly forced through the two sections of plumbing that provide cooling. If this is the case, my guess is that at lower thrust levels, the mass flow through the engine is less and therefore the regenerative cooling is reduced, so the CCV is closed to pick up the slack. Indeed, the source referenced at the end of section 1.4.1, reference 5, doesn't mention anything about "maximum cooling" or "reduced cooling," and simply states the valve positions for various throttle levels, which makes me think that these statements in the article are incorrect. Of course, I could be entirely wrong about this - perhaps someone more knowledgeable than me can elaborate. — Preceding unsigned comment added by 67.83.150.17 ( talk) 17:09, 24 November 2021 (UTC)