Talk:RL10

message: RL-10 (rocket engine) → RL-10 – Unnecessary disambiguation -- GW_SimulationsUser Page | Talk 11:09, 26 August 2006 (UTC)
replies: text: It was moved, . —Centrx→talk • 02:51, 7 September 2006 (UTC)
thread_title: Requested move

message: I know of no reason to believe Blue Origin might be using RL-10s, or even any similar engine.  Everything I've heard (including the WP article) says they use HTP and RP-1 (or other kerosene).  That and weasel words ("It is not known if...") justify removal of the comment, imho.  I think it should be replaced only if there is a reputable current reference. Evand (talk) 15:03, 28 December 2008 (UTC)
thread_title:  Blue Origin, speculation - removed 

message: There is an assertion in Rocket Propulsion Elements, by George Paul Sutton and Oscar Biblarz that the RL10B-2 delivers the highest specific impulse of any chemical rocket engine. (p. 224).  If this is correct it should be mentioned prominently in the lede of the article.  One source shows 464 sec.  This is presumably due in large part to the 285:1 nozzle expansion ratio, yes? (sdsds - talk) 07:06, 4 September 2009 (UTC)
replies: text: If correct, I concur.  (My copy of Sutton isn't handy at the moment, and p 224 isn't in the Google Books preview.)  However, it needs to be qualified appropriately.  Higher Isp has been achieved in testing (Li-F2-H2 tripropellant has reached 546 seconds).  I suspect the correct qualifier is highest Isp of any flight engine. Evand (talk) 22:13, 6 September 2009 (UTC)
thread_title:  Highest Isp of any chemical rocket engine 

message: This article has been reverted by a bot to  as part of a large-scale clean-up project of multiple article copyright infringement. (See the investigation subpage) This has been done to remove User:Accotink2's contributions as they have a history of extensive copyright violation and so it is assumed that all of their major contributions are copyright violations. Earlier text must not be restored, unless it can be verified to be free of infringement. For legal reasons, Wikipedia cannot accept copyrighted text or images borrowed from other web sites or printed material; such additions must be deleted. Contributors may use sources as a source of information, but not as a source of sentences or phrases. Accordingly, the material may be rewritten, but only if it does not infringe on the copyright of the original or plagiarize from that source. Please see our guideline on non-free text for how to properly implement limited quotations of copyrighted text. Wikipedia takes copyright violations very seriously. VWBot (talk) 05:56, 10 December 2010 (UTC)
thread_title:  Copyright problem 

message: It is worth noting that in the picture of the CECE you see ice forming at the nozzle edge.
This naturally has a negative impact on efficiency  —Preceding unsigned comment added by 71.178.199.89 (talk) 17:07, 21 February 2011 (UTC)
thread_title:  CECE efficiency 

message: There seems to be an inconsistency between this article and Centaur (rocket stage) as to the first flight date. The first Centaur flight was in 1962, but it was unsuccessful; this article gives a first flight date of 1963. I see no evidence that the first Centaur flight used a different engine type, so there seems to be a bit of an issue here. Mangoe (talk) 13:23, 13 December 2011 (UTC)
thread_title:  Date issue for first flight of Centaur and RL10 

message: The article currently states that the engine was developed by Rocketdyne. This is not the case - it was developed by Pratt & Whitney in the 50s, when Rocketdyne was its rival, being owned by North American Aviation. Pratt & Whitney then bought Rocketdyne, but this does not mean that Rocketdyne developed the engine, as it was already in production before P&W purchased Rocketdyne. A more accurate way to state the situation in the article would be 'developed by Pratt & Whitney and currently manufactured by Rocketdyne'. SalopianJames (talk) 12:47, 26 February 2012 (UTC)
replies: text: I just reverted such a change again. The RL10 was a Pratt & Whitney produnct, not Rocketdyne. - BilCat (talk) 00:59, 4 December 2014 (UTC)
thread_title:  Rocketdyne vs Pratt & Whitney 

message: This user has been reinserting badly sourced material and partially unsourced WP:OR material over the objections of other editors without engaging on the Talk page first, as requested, and as per WP:BRD. The edit-warring has been happening both here and over at RL60. Some of the proposed material can no doubt be added to the page, but it needs better sourcing and a consensus first. Martijn Meijering (talk) 16:34, 4 December 2014 (UTC)
thread_title:  Edit warring by 99.194.201.73 

message: The summary box lists the first flight as 1962, the introduction gives 1961, & History has 1962.
The summary lists nozzle ratios of 84:1 & 280:1 but the variant table gives 84:1 & 250:1 (note that this will change once the RL10C-1 is launched).
The summary gives the Isp as 450 to 465.5 (said in the notes to be for the RL10B-2), Improvements & Specifications give 464, & the variant chart has 462.
The summary & variant chart give the diameter as 2.13 m (7 ft 0 in) while Specifications gives 87 in (2.21 m).
I'm not sure of this, but the photo of the second stage of a Delta IV Medium looks like it might be missing the nozzle extension.
69.72.92.87 (talk) 06:56, 6 December 2014 (UTC)
replies: text: Any fixed yet, or Has anyone checked these against the references given ? I'll try to start next time I come by. (Commenting to delay archiving) - Rod57 (talk) 06:33, 8 January 2024 (UTC)
thread_title:  Inconsistent data : dates, nozzle ratios, Isp, diameter

message: Since cost prompted a search for alternatives: What was the approx cost of an RL10A or RL10B  in 2012 ? - Rod57 (talk) 12:34, 10 January 2018 (UTC)
replies: text: suggests they are about $17 million each ! - Rod57 (talk) 04:31, 16 January 2018 (UTC)
thread_title:  What is the approx price 

message: The first (at the moment) picture caption on the main page is "An RL10A-4 engine in London's Science Museum", but when the picture is clicked on and viewed by itself, the caption "Eight of these kerosene burning rocket engines loft the first stage of the Saturn 1 and 1B launch vehicle. LOX is the oxidiser" appears.  'Kerosene burning' presumably should instead be 'hydrogen burning'.
Jwpat7 (talk) 16:18, 27 January 2018 (UTC)
replies: text: In fact the entire caption is wrong as it appears to be referring to a different engine entirely; the H-1 engine, of which there were eight on the first stage of Saturn 1 and 1B. The image is not an H-1. ChiZeroOne (talk) 18:11, 27 January 2018 (UTC)
thread_title:  Picture caption refers to Saturn "kerosene burning rocket engines" - fixed 

message: The sections in the history section on improved versions appear to be outdated, as they describe a bunch of projects which started some years back but whose conclusions are never discussed. Probably most of the successor projects have the same issue. Can these be brought up to date? Mangoe (talk) 00:30, 19 June 2020 (UTC)
thread_title:  Improvements? 

message: One RL10B-2 on a Delta IV M+ 2nd stage centaur, had a thrust anomaly on USA-239 GPS launch in 2012. It seems there was a fuel leak into the combustion chamber.. Worth noting ? - Rod57 (talk) 09:42, 21 July 2020 (UTC)
thread_title:  Launch anomalies 

message: ULA says they're using the RL10A-4-2 on the Centaur upperstage for their test launch of the Starliner (potential crew capsule for ISS trips) today, 19-May-2022, yet it's listed here as "retired." I don't see a source for the retired label and maybe this is a pair of old engines they had lying around, so I didn't want to change the main article, but it does make me question whether that's accurate or not.
See ATLAS V TO LAUNCH STARLINER OFT-2 "The Atlas V configuration for this mission is powered by dual RL10A-4-2 engines, each producing 22,600 lbs (100.5 kilo-Newtons) of thrust."
Sp30305 (talk) 19:18, 19 May 2022 (UTC)
replies: text: Seems fixed, now says Active (Centaur SEC, Centaur DEC). But maybe all later Atlas V Centaur will use different version RL10C-1. - Rod57 (talk) 07:17, 8 January 2024 (UTC)
replies: text: The Kuiper flight also used an A-4-2. We know Starliner DECs will all have A-4-2s and it's looking more likely for Kuiper launches. That'd take A-4-2 use all the way to the end of Centaur III. Sub31k (talk) 07:59, 8 January 2024 (UTC)
thread_title:  RL10A-4-2 really retired? - No, active on Atlas V May 2022 

message: @Mfb@Lazaro Fernandes@AmigaClone@Ergzay@Rod57 anyone of you know about RL-10 engine. If yes, please come forward and fix this issue raised by Tim Dodd on Twitter
https://x.com/Erdayastronaut/status/1744083615619699030?s=20
I am feeling shy of falling into controversies if i edit this famous engine's page. (He summons us to correct this)
Thanking in advance, RIP B1058 (talk) 20:17, 7 January 2024 (UTC)
replies: text: I don't know much about the RL-10, sorry Lazaro Fernandes (talk) 22:32, 7 January 2024 (UTC)
thread_title:  Inconsistent data with respect to L3Harris Tech