Discussion[edit]

I am planning on adding quite a bit more to this article, including more information about the components of the system, the pros and cons of the EMALS compared to the steam catapult, and a little bit about the history of the system. Any suggestions for more content that would be relevant to this article? –bl7904

That all sounds good. Just do what you can to cite your sources, so that the information you add doesn't get challenged as original research. I look forward to your work.--Father Goose (talk) 06:41, 8 March 2008 (UTC)[reply]
Goose, thanks for the feedback. And I know all of my footnotes reference the same source at the moment; I do have other sources but haven't included them yet in the article. Bl7904 (talk) 21:07, 14 March 2008 (UTC)[reply]


"Steam catapults also suffer from salt corrosion, as seawater must be boiled to produce the steam for their operation, a problem not present in electromagnetic catapults." - I would have to say this comment is not true. The steam used in steam catapults on Nimitz class carriers, for example, comes from the ships supply of engineering fresh water. It's the same water used to generate steam for the ships main propulsion. I know this because I was responsible for the Nimitz's four catapult steam systems for over 2 years. The main feed water lines come from the engineering spaces, where it is dumped into a highly pressurized tank. The actual steam that goes into the catapult cylinders is generated by flash boiling as a result of a change in pressure when the launch valve is operated. Any salt water corrosion problems they have are related to their external exposure to the elements of the sea and the water brakes (which use seawater), and not to the method by which their steam is generated, since the salt has been removed long before that water reaches the catapult. I would imagine the exposure problem would not go away for EMALS. However, I would think that EMALS would take up a heck of a lot less space!Zogblog (talk) 22:28, 10 March 2008 (UTC)[reply]

I removed the sentence. You could have as well (be bold!), but thanks for the explanation here as well.--Father Goose (talk) 00:05, 11 March 2008 (UTC)[reply]

I don't think that the USS Enterprise photo is relevant to this article, since the Enterprise has steam catapults. Tom Hubbard (talk) 19:25, 12 October 2010 (UTC)[reply]

It's no skin off my nose but... this system will also generate a massive electromagnetic signature, not so? Why is this not seen as a disadvantage? Or do the plenitude of observation/tracking satellites make this a moot point? If so, then I must conclude that all this "stealth" navy tech is simply a waste of hard cash and time. 41.13.68.95 (talk) 10:59, 24 June 2015 (UTC)[reply]

Help on references[edit]

Could someone please help me with my second reference? The url is displaying as text instead of a link, and I can't figure out what's wrong with it. Thanks. Bl7904 (talk) 03:33, 5 April 2008 (UTC)[reply]

You apparently needed an http: in front of it.--Father Goose (talk) 07:18, 5 April 2008 (UTC)[reply]

Criticism[edit]

There very much needs to be a section on criticisms of EMALS and the problems the Navy is having with the system. There have been multiple test failures, most notably the Jan 2010 accident that damaged the system and set testing back for months. Rep. Gene Taylor has noted in hearings that the Navy basically has no Plan B if this system isn't ready on time, and that the CBO says that EMALS is alone responsible for over $1.3 billion in the Ford's cost overruns. This article is lacking without these kinds of details. DesScorp (talk) 18:06, 25 May 2010 (UTC)[reply]

Advantages[edit]

I've heard, steam catapults may have problems, caused by low temperatures in nothern seas - frozen water can block and damage catapult's tubes and track. That is why Russian carrier has no catapults (Russian's said it). Is it true? Ходок (talk) 07:50, 18 August 2010 (UTC)[reply]

Electromagnetic pulse?[edit]

I ran across this article by accident and a section that seems useful would be discussion of the launch systems' electromagnetic pulse signature and its affect on launch personal, avionics plus weapons electronics. A quick search finds Carrier Launch System Passes Initial Tests which says "So far, tests show no signs that the powerful electrical surges cause electromagnetic interference with aircraft, ammunition or ejection seats." --Marc Kupper|talk 19:41, 20 November 2010 (UTC)[reply]

cat- boom[edit]

Is there still a large shake and boom below deck foward ship with the electromag launch sys? —Preceding unsigned comment added by Paul kindle (talk • contribs) 02:59, 29 April 2011 (UTC)[reply]

Paul the answer to that question will be answered when the USS Gerald Ford CVN-78 starts her flight deck quals after she gets commisioned. That is still at least 3 or 4 years away.Jhunph (talk) 09:25, 12 December 2011 (UTC)Israel Pineiro Jr 12/12/2011[reply]

F-35B or C[edit]

I believe there's a small error in the section where the article states that the catapult successfully launched an F35C. I believe it should be F35B. There's a picture in the article about the F35 where what appears to be an F35B is launched. Both versions are intended for carrier-use, but the C-version is supposed to be launched from a conventional carrier while the B is supposed to be launched from LHDs.

07:33, 28 April 2013 (UTC)85.19.145.110 (talk)

The article linked to clearly calls the aircraft the F-35C. Only the C model is capable of using catapults and arresting gear, even EMALS. Also, the aircraft in both the photos and the video is clearly marked with "CF" on the tail; the B models carry a "BF" prefix, and the USAF A models are marked with "AF". -BilCat (talk) 12:53, 28 April 2013 (UTC)[reply]


C is the Naval Catapult Variant, B is the STOVL / VSTOL variant a B type would not be catapulted 81.110.29.8 (talk) 20:20, 13 May 2013 (UTC)[reply]

Broken link to EDN article[edit]

Reference [2] was:

http://www.edn.com/contents/images/207108.pdf

Is now found at:

http://www.edn.com/Pdf/ViewPdf?contentItemId=4341471

(Apologies -- have never made a Wikipedia entry, and don't want to mess up the page) — Preceding unsigned comment added by Banchang (talk • contribs) 00:46, 15 May 2014 (UTC)[reply]

I have fixed it SwiftingSpeed (talk) 08:32, 7 November 2014 (UTC)[reply]

Ship ready, launcher not?[edit]

Just came across a news article, putting it here for reference. It also suggests that the arrestor system is not ready for use, yet. [1] June 19, 2015. and same at "Icebergs ahead for expensive US, UK aircraft carrier projects" - 220 of Borg 06:52, 21 June 2015 (UTC)[reply]

Requests.[edit]

1. Does EMALS rely on super-conductivity, like maglev railways do or is is it a room-temperature system? The article could clarify this detail.

2. If understand correctly, EMALS uses juice from fission reactors to spin up 3-4 giant unipolar generators to very high RPM, which are then tapped for insanely large electric currents for ~3 seconds of launch. However, should any of those rotors fail catastrophically in the axle at max RPM, the disc will run amok and grind down the ship's foward secion in circular-saw style? What measures prevent sinking in that case? (The motor-generators of diesel electric locomotives, while slower RPM, sometimes break free and wreck the vehicle down to chassis and then run across the field, collapsing structures they encounter, spinning around like a pop diva, before coming to rest.)

3. The article doesn't say if EMALS is planned for civilian use as well? (The newest generation of jetliners, e.g. B787, A350 appear to have unreasonably long take-off runs, up to 3100 meters at maximum weight. This leaves pilots with a tiny margin of safety, should any mishap requiring stopping occur during the dash. Note that most airstrips are 3750 meters long or less. But very central airports, e.g. New York, London, Tokyo could possibly install an EMALS-derived system under the runway to lessen take-off run distance and save fuel while increasing safety.) 92.52.233.232 (talk) 12:51, 20 August 2015 (UTC)[reply]

Ground carriage[edit]

Hi BilCat, can you explain why you think there should be no link between the two articles?Thanks, --Gnom (talk) 13:55, 24 March 2016 (UTC)[reply]

I am reinserting the link. See the above question about a civilian application of this concept. --Gnom (talk) 09:45, 1 April 2016 (UTC)[reply]

Trump Criticisms quote[edit]

Someone just took the Trump Quote this out of the article. When the commander in chief of the US forces criticizes this system, it's relevant.104.163.158.183 (talk) 04:36, 12 May 2017 (UTC)[reply]

I took it out per WP:NOTNEWS. Trump criticizes almost everything, and most of them are just negotiating ploys. By regurgitating everything he says, you just play right into his hand. - BilCat (talk) 04:40, 12 May 2017 (UTC)[reply]
This does not have anything to do with presidential negotiating. Wikipedia is not a site whose content varies depending on what we think the speaker meant: We are not here to interpret the value of a quote on the article subject by the 'leader of the free world.' Set up an RFC if you do not think it should be included. 104.163.158.183 (talk) 04:44, 12 May 2017 (UTC)[reply]
An RFC isn't needed,just a consensus here to readd it. Till you get it, keep it out. - BilCat (talk) 04:46, 12 May 2017 (UTC)[reply]
You're the only one objecting, because you did not like my edit summary about Trump's "word salad", which is actually a term that is widely used to refer to his speech. (See "President Trump’s wilted word salad on helping urban communities" (Washington Post), "Donald Trump’s Chilling Language, and the Fearsome Power of Words" (Vanity Fair) and "2016: the year of anger, Trump’s ‘word salad’ and anti-rhetoric" (Financial Times), for example.) A half-dozen editors before you and I were fine with the quote. More voices are needed here.104.163.158.183 (talk) 04:59, 12 May 2017 (UTC)[reply]
I'm objecting because it's much ado about nothing, and because WP is not news. Trump isn't the first person to criticize EMALS, and no policy decision has been made either, as EMALS hasn't been canceled. - BilCat (talk) 05:12, 12 May 2017 (UTC)[reply]
He's the head of the US Military-- the organization that ordered the system that the article is about. Sure, he looks, talks and thinks like a fool, but what he says about anything while he is president is a matter of importance and part of a lasting public record that will be repeated for decades, if not centuries. It has been that way with every president: what they say matters. You do not get to pick and choose which statement you like. He made a blistering and long comment about this system in a major magazine (Time), and that belongs in the article. I added four more good sources to the quote. 104.163.158.183 (talk) 05:20, 12 May 2017 (UTC)[reply]
We all get to pick what belongs in WP every day. It's how we apply WP:NOT. I'm not objecting to it on the basis of whether or not I like the statement. It's just way too soon, as no decision has been made. - BilCat (talk) 05:32, 12 May 2017 (UTC)[reply]
Trump's statement is clearly incorrect, but since he is both a significant public figure and the commander-in-chief of the US military, I can't really buy the argument that the criticism is not relevant to the article. - Brouhaha (talk) 05:47, 12 May 2017 (UTC)[reply]
I disagree that the comments should remain in the article at this time. Incoherent blatherings in a newspaper or magazine interview may well be newsworthy and make great copy for the media. This is not the media. Before such pronouncements warrant inclusion in this article, at the very least there needs to be some official announcement and subsequent discussion by relevant and informed sources that we can cite so as to gain an appreciation of the real importance of the position. Trump has form for saying all sorts of outrageous things then neither following up on them or changing them in the implementation so that they become unrecognisable. Is this one of those cases? Too soon to tell. This is not a news service and there is no deadline here. We should wait until the true situation becomes clear before bursting into print. - Nick Thorne talk 08:42, 12 May 2017 (UTC)[reply]

RFC[edit]

The following discussion is an archived record of a request for comment. Please do not modify it. No further edits should be made to this discussion. A summary of the conclusions reached follows.
Those advocating deletion (and many of the keeps) see the main issue being with the quote itself, not the content. Thus, the result of this RFC is to keep but rewrite and delete the full quote. The President does have influence in this sphere, so his statements regarding the appropriateness of a system he's "in charge of" are worth including, but using the whole quote gives undue weight to the President himself and not his criticisms of the system. Primefac (talk) 21:02, 1 July 2017 (UTC)[reply]

Should the "Criticisms" section contain the following recent quote on the article subject by President Trump? 104.163.158.183 (talk) 20:34, 12 May 2017 (UTC)[reply]

"It sounded bad to me. Digital. They have digital. What is digital? And it’s very complicated, you have to be Albert Einstein to figure it out. And I said–and now they want to buy more aircraft carriers. I said what system are you going to be–'Sir, we’re staying with digital.' I said no you’re not. You're going to goddamned steam, the digital costs hundreds of millions of dollars more money and it’s no good."[1][2][3][4][5]

  1. ^ "Read Donald Trump's Interview With TIME on Being President". Time. Retrieved 2017-05-11.
  2. ^ https://www.navytimes.com/articles/trump-says-navy-should-ditch-carrier-emals
  3. ^ ‘You have to be Albert Einstein to figure it out’: Trump targets the Navy’s new aircraft catapult - The Washington Post
  4. ^ President Trump Wants Ford Carriers to Use ‘Goddamned Steam’ Catapults Instead of ‘No Good’ Electromagnetic Launchers
  5. ^ General Atomics mum on Trump's 'goddamned steam' criticism of new carrier catapult - The San Diego Union-Tribune
Don't need quite so many citations that all depend on the same source. More important, didn't Senator McCaine call the project something like "bloated, overpriced" a couple years ago? Of course, he's a bit more interested in subtleties such as the distinction between a bad proposal and a bad execution. Jim.henderson (talk) 22:41, 12 May 2017 (UTC)[reply]
I think a lot of people would say that US presidential statements and actions are notable and important by default. Do you think the Trump presidential library will omit or include his tweets?104.163.158.183 (talk) 02:07, 13 May 2017 (UTC)[reply]
Yes, and a lot of people think the world is flat. An appeal to popularity is not very convincing. ' Nick Thorne talk 03:29, 13 May 2017 (UTC)[reply]
Nope, you are conflating two different things. Presidential statements on specific programs are by their very nature significant. You're trying to say some are and some are not. If the head of Apple suddenly came out and said that the Mac should go back to G4 processors, would you ignore that too?104.163.158.183 (talk) 05:16, 13 May 2017 (UTC)[reply]
But this was not a presidential statement, it was incoherent waffle given in a magazine interview. Until at the very least a formal policy statement is made on the subject and that is examined and discussed by relevant experts that we can cite, there is no way any of us here can judge the importance of this quote. To suggest anything else is straight out original research. - Nick Thorne talk 05:58, 13 May 2017 (UTC)[reply]
Everything Trump says as president is a presidential statement. I can see the pragmatic side of your position: we should ignore this as it is similar to a little kid running into a room saying "Mommy, electric launchers are dumb!". That should be ignored. However this is not a little kid-- this is the most powerful person in the world. All of his statements are significant. Everything a US President says publicly gets recorded, archived, reproduced and is written about in books... even the stupid stuff. 104.163.158.183 (talk) 06:03, 13 May 2017 (UTC)[reply]
Yep, and once it's been "recorded, archived, reproduced and is written about in books" we will have something with proper context about which we can write and from which we can cite. At the risk of repeating myself there is no rush, Wikipedia is not a news service, there is no compulsion to include everything as it happens. We simply cannot possibly know at this point whether this statement will have any impact whatsoever on the use of EMALS in American carriers. This is not an article about the sayings of the US President, it is about an aircraft carrier aircraft launching system and it is far from clear what effect, if any, Trump's statement will have on it. The comment does not belong here at this time (if it ever will). - Nick Thorne talk 06:49, 13 May 2017 (UTC)[reply]
Comment True, he's "not a subject matter expert", but he is the CEO of the military that ordered the project, and can easily order it cancelled should he desire.104.163.158.183 (talk) 03:19, 15 May 2017 (UTC)[reply]

The Navy said Thursday that it was developing a response. A Pentagon official, speaking on the condition of anonymity because of the sensitivity of speaking about the president, said that Trump’s comments caught defense officials off-guard and are inaccurate.

“You can see elements of reality in what he said, but I think he may have spoken without having all of the information in front of him,” the official said. “I think he either has time-late information, or the information he has is not correct.”

and

Jerry Hendrix, a retired Navy captain and defense analyst with the Center for a New American Security, said Thursday that Trump’s criticism “has merit” but that many of the issues that initially were raised about the catapult already have been resolved. Now would not be a good time to go back and install steam systems on the new carriers, he said: The Ford is all but finished, and construction of the Kennedy is already underway.

--Slashme (talk) 07:34, 17 May 2017 (UTC)[reply]

The discussion above is closed. Please do not modify it. Subsequent comments should be made on the appropriate discussion page. No further edits should be made to this discussion.

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UK References[edit]

There is a problem with the UK references, in that they don't mention procurement of an Electromagnetic aircraft launch system. A quick Google search only returned a press release which is not suitable as a reference. If no references for UK development of an EM launch system can be found perhaps the section should be deleted. --Klaun (talk) 03:21, 19 December 2017 (UTC)[reply]

Pentagon report on EMALS[edit]

The Pentagon released a scathing report about EMALS earlier this year, that for some reason hasnt been picked up on in this article. I've included that in the Criticism section and included a reference.

Cheers! — Preceding unsigned comment added by 192.38.137.160 (talk) 17:24, 23 November 2018 (UTC)[reply]

EMALS image[edit]

A drawing of the linear induction motor used in the EMALS.

How do we actually know the image depicts what it says? There isn't a source on what it is based on in its description, and I am not sure if it would be worth my time trying to vectorise it. The author Tosaka last uploaded in 2010, and I haven't a clue where to find their English Wikipedia account to contact them. Seloloving (talk) 09:48, 17 June 2022 (UTC)[reply]

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